JP7297134B1 - System for recycling methyl (meth)acrylate and method for recycling methyl (meth)acrylate - Google Patents

Abstract

An object of the present invention is to prevent clogging of pipes and fire and explosion. SOLUTION: A recycling system 1 for recycling methyl (meth)acrylate from scrap moldings obtained by molding a (meth)acrylic resin composition containing a (meth)acrylic polymer includes an input section 12 and a gas extraction section. 14, and a gas containing methyl (meth)acrylate is introduced to capture residues containing undecomposed components contained in the gas containing methyl (meth)acrylate, A first capture tank 52 for removal as residue containing undecomposed components, and a purifier for purifying the gas containing methyl (meth)acrylate and (meth)acrylic acid processed by the first capture tank. a gas treatment unit 70 selected from the group consisting of coolers for cooling the methyl-containing gas. [Selection drawing] Fig. 1

Description

The present invention relates to a system for recycling methyl (meth)acrylate and a method for recycling methyl (meth)acrylate.

Polymethyl (meth)acrylate (PMMA), which is a polymer obtained by polymerizing methyl (meth)acrylate (MMA), has excellent transparency and weather resistance. Therefore, polymethyl (meth)acrylate is widely used as a material for members constituting automobile parts, signboards, display devices, and the like.

With the recent surge in resource prices and the heightened awareness of environmental issues, products (molded bodies) containing polymethyl(meth)acrylate used for various purposes as described above are being collected. Recycling (reuse of resources) is planned.

Methods for recycling poly(methyl)acrylate include, for example, material recycling in which the collected molded article is subjected to the molding process again to produce a new molded article, and heat treatment of the collected molded article. Then, polymethyl (meth)acrylate is thermally decomposed (depolymerized) to recover methyl (meth)acrylate, and the recovered methyl (meth)acrylate (sometimes referred to as recycled MMA) is used. Chemical recycling for producing new molded articles, and thermal recycling for burning collected molded articles as fuel, directly using the combustion energy as a heat source, and further using the combustion energy to generate power are exemplified.

By heating polymethyl (meth)acrylate at a relatively low temperature of about 300 ° C., methyl (meth)acrylate can be recovered in a high yield and impurities can be reduced, so chemical It is preferably recycled by recycling.

In chemical recycling, for example, acrylic resin scrap is supplied to a twin-screw extruder having a closed cylinder, heated to 400 to 600 ° C. to thermally decompose, and cracked gas discharged from the tip of the twin-screw extruder. is sucked through a residue tank by the negative pressure effect of a cooler and a vacuum pump, and the cracked gas is condensed in the cooler to form a liquid monomer (see Patent Document 1). In addition, a mode is known in which a low-molecular-weight gaseous pyrolyzate obtained by supplying a synthetic polymer material to a cylinder and continuously heating it in the cylinder is led out of the cylinder and concentrated ( See Patent Document 2.).

JP-A-11-106427 U.S. Pat. No. 3,959,357

However, according to the techniques according to Patent Documents 1 and 2, mist-like undecomposed resin (undecomposed components) is entrained in the decomposition gas led out of the cylinder after the heat treatment, and the undecomposed resin accumulates in the piping. Furthermore, since the cracked gas is usually flammable, if the pipe is blocked, the cracked gas may leak out of the system and ignite and explode.

The inventors of the present invention have made intensive studies to solve the above problems, and found that the above problems can be solved by providing a predetermined configuration for capturing and removing the residue containing the undecomposed components. I came to complete it.

That is, the present invention provides the following [1] to [21].
[1] A recycling system for recycling methyl (meth)acrylate from scraps of moldings obtained by molding a (meth)acrylic resin composition containing a (meth)acrylic polymer,
A thermal decomposition apparatus having an input section for inputting the scrap and a gas extraction section for extracting a gas containing methyl (meth)acrylate generated by thermal decomposition of the (meth)acrylic resin composition. and,
It is connected to the gas extraction part by a first connecting pipe, introduces the gas containing methyl (meth)acrylate, and captures undecomposed components contained in the gas containing methyl (meth)acrylate. a first capture tank for removing undecomposed components as residue;
a purifier connected to the first capture tank by a second connecting pipe for purifying the gas containing methyl (meth)acrylate processed by the first capture tank; and a (meth)acrylic and a gas treatment device selected from the group consisting of a cooler for cooling said gas containing methyl acid.
[2] The regeneration system according to [1], wherein the pyrolyzer is an extruder, a kneader, or a fluidized bed heater.
[3] The regeneration system according to [2], wherein the pyrolyzer is an extruder.
[4] The first trapping tank collects a gas containing methyl (meth)acrylate generated by thermal decomposition of the (meth)acrylic resin composition at a softening point or higher of the (meth)acrylic resin composition and ( The regeneration system according to any one of [1] to [3], which has a temperature control unit capable of keeping and heating to a temperature below the ignition point of the gas containing methyl methacrylate.
[5] A first residue lead-out connecting pipe for leading out the residue containing undecomposed components from the first capture tank, comprising a first residue on-off valve for adjusting the flow of the residue. The residue connected by a first residue deriving connecting pipe and containing the undecomposed components captured in the first capture tank, the residue containing the undecomposed components derived from the first capture tank. The regeneration system according to any one of [1] to [3], comprising a residue storage device including a storage tank for storing residue.
[6] A second residue lead-out connecting pipe for leading out the residue containing undecomposed components from the first capture tank, the second connecting pipe for adjusting the flow of the residue containing undecomposed components. is connected to the first capture tank by a second residue lead-out connecting pipe equipped with an on-off valve for residue, and introduces the residue containing undecomposed components derived from the first capture tank, further comprising a second capture tank for storing;
wherein said residue storage tank is connected to said second capture tank, said residue containing undegraded components captured in said second capture tank, said residue containing said third residue from said second capture tank; A storage tank for storing the residue containing undecomposed components led out by the lead-out connecting pipe, and a third residue connection for leading out the residue containing undecomposed components from the second capture tank. The regeneration system according to [5], wherein the pipe is connected by a third residue lead-out connecting pipe having a third residue on-off valve for adjusting the flow of the residue containing undecomposed components. .
[7] The second trapping tank traps a gas containing methyl (meth)acrylate generated by thermal decomposition of the (meth)acrylic resin composition at a softening point of the (meth)acrylic resin composition or higher, and The regeneration system according to [6], which has a temperature control section capable of keeping or heating to a temperature below the ignition point of the gas containing methyl (meth)acrylate.
[8] At least one of the first to third residue lead-out connecting pipes adjusts the temperature of the pipe part through which the gas containing methyl (meth)acrylate flows and the gas containing methyl (meth)acrylate. The regeneration system according to any one of [5] to [7], including a temperature control unit for
[9] a first inert gas supply unit connected to the second trapping tank for supplying inert gas to the second trapping tank;
A first inert gas connection pipe that connects the first inert gas supply unit and the second trapping tank, the first inert gas having a first inert gas on-off valve. connecting pipe for
A second inert gas connecting pipe connecting the first trapping tank and the second trapping tank, the second inert gas connection pipe having a second inert gas on-off valve. The regeneration system according to any one of [6] to [8], further comprising a connecting pipe.
[10] The residue storage device is provided so as to be in contact with the outer surface of the storage tank, and includes a cooling unit for cooling the stored residue and supplies an inert gas into the storage tank. and a gas discharge unit connected to the storage tank for discharging gas containing the inert gas out of the storage tank, or The regeneration system according to any one of [5] to [9], which is connected to a storage tank and has a cooling water supply unit for supplying cooling water into the storage tank.
[11] The regeneration system according to [10], wherein the residue storage device has the cooling section, the second inert gas supply section, and the gas discharge section.
[12] The regeneration system according to [11], wherein the cooling unit includes a jacket through which a refrigerant can flow.
[13] The regeneration system according to [12], wherein the refrigerant is water.
[14] the second inert gas supply unit is a functional unit capable of supplying an inert gas from the top of the storage tank;
The regeneration system according to [10], wherein the gas discharge section is a functional section capable of discharging gas from the top of the storage tank.
[15] The regeneration system according to [10], wherein the inert gas is nitrogen gas.
[16] The first connecting pipe includes a pipe section for circulating the gas containing methyl (meth)acrylate and a temperature control section for controlling the temperature of the gas containing methyl (meth)acrylate. , the reproduction system according to any one of [1] to [3].
[17] The first connecting pipe has at least two temperature control parts, and the first temperature control part located closest to the gas extraction part contains methyl (meth)acrylate. The temperature other than the first temperature control section, which is a temperature control section for cooling the gas and includes a second temperature control section located closer to the first capture tank than the first temperature control section. The regeneration system according to [14], wherein the control unit is a temperature control unit for heating the gas containing methyl (meth)acrylate.
[18] The regeneration according to any one of [1] to [3], wherein the average inner diameter of the first connecting pipe is larger than the average inner diameter of the second connecting pipe. system.
[19] A method for regenerating methyl (meth)acrylate using the regeneration system according to any one of [1] to [3],
a pyrolysis step of pyrolyzing the scrap by the pyrolyzer to generate a gas containing methyl (meth)acrylate;
The gas containing methyl (meth)acrylate is introduced into a first capture tank to capture the residue containing undecomposed components contained in the gas containing methyl (meth)acrylate to contain the undecomposed components. a removal step of removing as a residue;
said gas containing methyl (meth)acrylate treated by said first capture tank is led out of said first capture tank through a second connecting pipe, and is selected from the group consisting of a purifier and a cooler; A method for regenerating methyl (meth)acrylate, comprising a treatment step of introducing into the gas treatment apparatus for treatment.
[20] In the method for regenerating methyl (meth)acrylate according to [19],
The regeneration system is connected to the first capture tank, and the residue comprising undegraded components captured in the first capture tank, the residue being discharged from the first capture tank. further comprising a residue storage device including a storage tank for storing said residue containing ingredients;
The regeneration method further comprising a storage step of introducing and storing the residue containing the undecomposed components removed in the removal step from the first capture tank into the residue storage device.
[21] A method for regenerating methyl (meth)acrylate using the regenerating system according to [9],
a pyrolysis step of pyrolyzing the scrap by the pyrolyzer to generate a gas containing methyl (meth)acrylate;
The gas containing methyl (meth)acrylate is introduced into a first capture tank through a first connecting pipe to capture the residue containing undecomposed components contained in the gas containing methyl (meth)acrylate. and a removing step of removing as the residue containing undecomposed components;
said gas containing methyl (meth)acrylate treated by said first capture tank is led out of said first capture tank through a second connecting pipe, and is selected from the group consisting of a purifier and a cooler; a treatment step of introducing into the gas treatment apparatus and treating;
Opening the second residue on-off valve with the third residue on-off valve closed, and opening the second inert gas on-off valve with the first inert gas supply valve closed. the residue containing the undecomposed components from the first capture tank is led out to the second capture tank through the second residue lead-out connecting pipe, and the residue containing the undecomposed components is transported to the second capture tank. A temporary storage step of storing,
By opening the first inert gas on-off valve and the second inert gas on-off valve with the second residue on-off valve and the third residue on-off valve closed, the first The inert gas supplied from the inert gas supply unit is circulated from the second trapping tank to the first trapping tank to replace the combustible gas filling the second trapping tank with the inert gas, a storage preparation step for making preparations for detoxifying and storing the inside of the capture tank of 2;
With the second residue on-off valve and the second inert gas on-off valve closed, the third residue on-off valve is opened, and the first inert gas on-off valve is opened to remove undecomposed components. and a storage step of discharging and introducing the liquid residue containing the residue from the second capture tank into the residue storage device through a third residue lead-out connection pipe having a third residue on-off valve.

ADVANTAGE OF THE INVENTION According to this invention, blockage of piping, and also ignition explosion can be effectively prevented when the gas produced|generated by the thermal decomposition by the thermal decomposition apparatus is led out from the thermal decomposition apparatus.

FIG. 1 is a schematic diagram showing a configuration example of a playback system according to the first embodiment. FIG. 2 is a schematic diagram showing a configuration example of a playback system according to the second embodiment.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. It should be noted that each drawing only schematically shows the shape, size and arrangement of components to the extent that the invention can be understood. The present invention is not limited by the following description, and each component can be modified without departing from the gist of the present invention. In the drawings, redundant descriptions of the same components denoted by the same reference numerals may be omitted.

<First embodiment>
1. Reproduction System A reproduction system according to the first embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram showing a configuration example of a playback system according to the first embodiment.

As shown in FIG. 1, the playback system 1 of the first embodiment includes:
A recycling system 1 for recycling methyl (meth)acrylate from scrap moldings obtained by molding a (meth)acrylic resin composition containing a (meth)acrylic polymer, comprising an input unit 12 for inputting scrap. , a gas extraction unit 14 for extracting a gas containing methyl (meth)acrylate generated by thermally decomposing the (meth)acrylic resin composition; and
It is connected to the gas extraction part 14 by a first connecting pipe 40, and a gas containing methyl (meth)acrylate is introduced to remove the residue containing undecomposed components contained in the gas containing methyl (meth)acrylate. a first capture tank 52 for capturing and removing as a liquid residue containing undecomposed components;
The purifier and (meth)acrylic acid are connected to the first trapping tank 52 by the second connecting pipe 60 for purifying the gas containing methyl (meth)acrylate processed by the first trapping tank 52 . a gas treatment device 70 selected from the group consisting of a cooler for cooling a gas containing methyl acid.

(Explanation of terms)
"(Meth)acrylic" includes acrylic, methacrylic and combinations thereof.

A "(meth)acrylic polymer composition" is a composition that contains a (meth)acrylic polymer as a main component and may further contain other components.

A "(meth)acrylic polymer" is a polymer having monomer units derived from a monomer having a (meth)acrylic group.

Here, the (meth)acrylic polymer is, for example, a (meth)acrylic homopolymer containing only monomer units derived from an alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms; 85% by mass or more and less than 100% by mass of monomer units derived from an alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms, and a (meth) having an alkyl group having 1 to 4 carbon atoms A (meth)acrylic copolymer having more than 0% by mass and not more than 15% by mass of monomer units derived from an alkyl acrylate and other copolymerizable vinyl monomers mentioned.

“Alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms” is represented by, for example, CH ₂ ═C(CH ₃ )COOR (R is an alkyl group having 1 to 4 carbon atoms). It is a compound that

The vinyl monomer copolymerizable with alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms is copolymerizable with alkyl methacrylate having an alkyl group having 1 to 4 carbon atoms, and a monomer having a vinyl group.

Examples of alkyl (meth)acrylates having an alkyl group having 1 to 4 carbon atoms include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, tert-methacrylate, butyl, sec-butyl methacrylate, and isobutyl methacrylate. Alkyl methacrylate having an alkyl group of 1 to 4 carbon atoms is preferably methyl methacrylate.

Vinyl monomers copolymerizable with alkyl (meth)acrylates having an alkyl group of 1 to 4 carbon atoms include, for example, cyclohexyl methacrylate, benzyl methacrylate, 2-ethylhexyl methacrylate, and 2-hydroxy methacrylate. Methacrylic acid esters such as ethyl, hydroxypropyl methacrylate, and monoglycerol methacrylate (excluding alkyl methacrylates having alkyl groups of 1 to 4 carbon atoms); methyl acrylate, ethyl acrylate, propyl acrylate, Acrylic acid esters such as butyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and monoglycerol acrylate; acrylic acid, methacrylic acid, maleic acid, itaconic acid, maleic anhydride, unsaturated carboxylic acids such as itaconic anhydride or acid anhydrides thereof; nitrogen-containing monomers such as acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, diacetone acrylamide, dimethylaminoethyl methacrylate; allyl glycidyl ether, glycidyl acrylate, Epoxy group-containing monomers such as glycidyl methacrylate; and styrene-based monomers such as styrene and α-methylstyrene.

As a method for producing a (meth)acrylic polymer, for example, an alkyl (meth)acrylate having an alkyl group having 1 to 4 carbon atoms and, if necessary, an alkyl group having 1 to 4 carbon atoms The alkyl (meth)acrylate and the copolymerizable vinyl monomer may be polymerized by bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, or the like.

"Other components" that may be contained in the (meth)acrylic polymer composition include, for example, any suitable conventionally known mold release agent, polymerization regulator, which can be added to produce a molded article having predetermined properties. agents, polymerization initiators, UV absorbers and colorants.

The term “scrap” is generally used to refer to a waste material produced by molding a methyl (meth)acrylate polymer composition into various shapes by any suitable conventionally known injection molding process or the like, and used for a predetermined purpose. It is a used molded article collected as a molded article adjusted to a shape and size that can be used as a raw material in the recycling system according to the present invention. In addition, "scrap" may be a molded body adjusted to a shape and size that can be used as a raw material in the recycling system according to the present invention by recovering defective products during molding, or may be a molded body that is adjusted to a shape and size that can be used as a raw material in the recycling system according to the present invention. It may also be a molded body adjusted to a shape and size that can be used as a raw material in the recycling system according to the present invention by collecting offcuts generated in the post-process.

The "residue containing undecomposed components" may include components generated by thermal decomposition such as methyl (meth)acrylate.

Components that can configure the reproduction system 1 of the first embodiment will be specifically described below.

(1) Thermal Decomposition Device The regeneration system 1 of the present embodiment includes a thermal decomposition device 10 . The thermal decomposition apparatus 10 thermally decomposes scraps of moldings obtained by molding a (meth)acrylic resin composition containing a (meth)acrylic polymer into gas containing methyl (meth)acrylate and undecomposed components. A conventionally known device having any suitable configuration can be applied provided that it can generate a residue.

In this embodiment, examples of pyrolysis apparatus 10 include extruders, kneaders, and fluidized bed heaters.

In this embodiment, the pyrolyzer 10 is preferably an extruder. Suitable examples of extruders that are pyrolysis devices 10 include twin screw extruders such as co-rotating twin screw extruders and counter-rotating twin screw extruders.

In this embodiment, a kneader that can be suitably applied as the thermal decomposition apparatus 10 includes, for example, the apparatus described in US Pat. No. 1,030,1235.

In this embodiment, a fluidized bed heater that can be suitably applied as the pyrolysis apparatus 10 includes, for example, the apparatus described in Japanese Unexamined Patent Application Publication No. 2009-112902.

An example of the configuration of the thermal decomposition apparatus 10 will be described below, taking the configuration of a twin-screw extruder as an example.
A thermal decomposition apparatus 10, which is a twin-screw extruder, includes a thermal decomposition section 11 for heat-treating scrap as a raw material. The thermal decomposition section 11 corresponds to, for example, a cylinder in a twin-screw extruder for heat-treating inside while moving the raw material in the extending direction, and a screw arranged inside the cylinder.

In the present embodiment, the configuration of the twin-screw extruder, which is the thermal decomposition device 10, that is, the components constituting the thermal decomposition section 11, such as a cylinder and a screw, can adopt any conventionally known and suitable configuration.

The thermal decomposition section 11 is provided with an input section 12 for supplying scrap, which is a raw material, to the thermal decomposition section 11 . The charging section 12 has a structure corresponding to a hopper (feeder) in a twin-screw extruder. The hopper, which is the input part 12, is usually provided near the upstream end of the cylinder, which is the thermal decomposition part 11, so that the raw material can be supplied into the cylinder, which is the thermal decomposition part 11.

The thermal decomposition section 11 is provided with one or more gas extraction sections (vents) 14 for extracting gas containing methyl (meth)acrylate generated by thermal decomposition. The arrangement (position) of the one or more gas extraction portions 14 is not particularly limited, and may be any suitable arrangement corresponding to the design. For example, from the viewpoint of improving the efficiency of extracting the generated gas, the gas extraction part 14 is near the downstream end of the thermal decomposition part 11 on the opposite side to the already described introduction part 12, and the thermal decomposition part 11 is preferably provided on the upper end side of the When two or more gas extracting portions 14 are provided, they are preferably arranged at predetermined intervals (e.g., equal intervals) on the upper end side of the thermal decomposition portion 11 .

The thermal decomposition apparatus 10 has a residue discharge section 16 provided in the thermal decomposition section 11 . The residue discharge section 16 is a functional section for discharging the residue containing undecomposed components generated in the thermal decomposition section 11 . The residue discharge section 16 is preferably provided in the vicinity of the downstream end of the thermal decomposition section 11 .

(2) Connecting Pipe The regeneration system 1 of the present embodiment includes a connecting pipe 20 for functionally connecting the thermal decomposition device 10 already described and the residue storage device 30 described later in detail.

The connecting pipe 20 includes a pipe portion 22 for introducing (circulating) the residue containing undecomposed components from the thermal decomposition device 10 to the residue storage device 30 .

In the present embodiment, the pipe part 22 is provided with the condition that the residue containing the undecomposed components generated in the thermal decomposition device 10 can be led out from the thermal decomposition device 10 and introduced into the residue storage device 30. Materials and the like are not particularly limited. As the pipe portion 22, conventionally known arbitrary suitable stainless steel pipes or the like can be applied.

In this embodiment, the connecting pipe 20 further includes a temperature control portion 24 provided so as to contact the outer surface of the pipe portion 22 . The temperature control unit 24 is a functional unit for controlling the temperature of the residue containing undecomposed components derived from the thermal decomposition device 10 .

In this embodiment, the temperature control unit 24 is a functional unit that can control the temperature of the connecting pipe 20, that is, the pipe portion 22, to a temperature equal to or higher than the softening point of the residue containing undecomposed components and lower than the ignition point. More specifically, the temperature control section 22 is a functional section for cooling the residue containing undecomposed components flowing through the pipe section 22 .

As the temperature control unit 24, a conventionally known arbitrary suitable configuration can be applied. Specifically, the temperature control unit 24 is at least selected from the group consisting of a jacket, a double-tube heat exchanger, an electric heater, and a heat insulator through which a medium (heat medium, refrigerant) can flow. one can be applied.

When the temperature control section 24 is composed of two or more members such as a combination of a double tube heat exchanger and a heat insulating material, at least one member must be in contact with the outer surface of the tube section 22. In other words, two or more types of members may be provided so as to be laminated on the outer surface of the tube portion 22 .

The manner in which the temperature control section 24 is installed is not particularly limited as long as the temperature of the residue of the undecomposed components flowing through the pipe section 22 can be effectively controlled. The temperature control part 24 can be provided, for example, so as to cover the circumference of the pipe part 22 without interruption.

In this embodiment, it is preferable to use a double tube heat exchanger as the temperature control unit 24 . The double-tube heat exchanger is preferably a double-tube heat exchanger using steam as a heat medium or a double-tube heat exchanger using water as a refrigerant.

Moreover, when the temperature control unit 24 includes a heat insulating material, the heat insulating material is preferably at least one selected from the group consisting of rock wool, glass wool, calcium silicate, and water-repellent perlite.

According to the regeneration system 1 of the present embodiment, since the connecting pipe 20 is provided with the temperature control section 24, clogging of the connecting pipe 20 due to sticking of residues containing undecomposed components flowing through the pipe portion 22 and further ignition and explosion are prevented. can be effectively prevented.

Further, the regeneration system 1 of the present embodiment includes a first connecting pipe 40 for functionally connecting the pyrolyzer 10 already described and a first capture tank 52, which will be described later in detail. there is

In the present embodiment, the first connecting pipe 40 includes a pipe portion 42 through which a gas containing methyl (meth)acrylate can flow, and (meth)acrylic acid flowing through the pipe portion 42 (connecting pipe 40). A temperature control unit 44 for controlling the temperature of the methyl-containing gas is preferably included.

In this embodiment, the first connecting pipe 40 has at least two temperature control sections 40, as shown in FIG. 44A is the temperature control section 40 for cooling the gas containing methyl (meth)acrylate, and the second temperature control section 44B is arranged closer to the first capture tank 52 than the first temperature control section 44A. It is preferable that the temperature control unit 44 other than the first temperature control unit 44A containing methyl (meth)acrylate is a temperature control unit 44 for keeping warm or heating the gas containing methyl (meth)acrylate.

In the present embodiment, the pipe portion 42 included in the first connecting pipe 40 leads the gas containing methyl (meth)acrylate generated in the pyrolyzer 10 from the pyrolyzer 10 to the first capture tank. As long as it can be introduced into 52, its shape, material, etc. are not particularly limited. As the pipe portion 22, conventionally known arbitrary suitable stainless steel pipes or the like can be applied.

If the first temperature control section 44A of the at least two temperature control sections 44 is arranged closer to the gas extraction section 14, the temperature of the gas containing methyl (meth)acrylate derived from the thermal decomposition apparatus 10 adjusting the temperature of the gas containing methyl (meth)acrylate flowing through the pipe portion 42, i.e., the first connecting pipe 40, to a temperature above the boiling point and below the ignition point of the gas containing methyl (meth)acrylate, That is, it is a functional part that can be cooled.

The second temperature control unit 44B of the at least two temperature control units 44 raises the temperature of the gas containing methyl (meth)acrylate derived from the thermal decomposition apparatus 10 to a temperature above the boiling point and below the ignition point. The part 42 is a functional part capable of adjusting the temperature of the gas containing methyl (meth)acrylate flowing through the first connecting pipe 40, that is, keeping it warm or heating it.

The manner in which the temperature control section 44 is installed is not particularly limited, provided that the temperature of the gas containing methyl (meth)acrylate flowing through the pipe section 42 can be effectively controlled. The temperature control part 44 can be provided, for example, so as to cover the circumference of the tube part 42 without interruption. In addition, at least two temperature control units 44 can be provided so as to be spaced apart from each other by a predetermined distance.

As the temperature control unit 44, a conventionally known arbitrary suitable configuration can be applied. Specifically, the temperature control unit 44 includes, for example, a jacket or double-tube heat exchanger through which a medium (refrigerant or heat medium) can be circulated.

In this embodiment, it is preferable to use a double tube heat exchanger as the temperature control unit 44 .

In the jacket or double-tube heat exchanger already described, which is the temperature control section 44, media that can be used to control the temperature of the gas containing methyl (meth)acrylate include water, air, oil, molten salt, and water vapor. It is preferable to use at least one selected from the group consisting of.

Examples of oils that can be suitably used as a medium (refrigerant medium or heat medium) in the temperature control section 44 include methylphenylsilicone oil, dimethylsilicone oil, liquid paraffin, and a mixture of diphenyl and ciphenyl oxide.

A mixture of alkali nitrate and nitrite is an example of the molten salt that can be suitably used as the medium (refrigerant medium or heat medium) in the temperature control section 44 .

According to the regeneration system 1 of the present embodiment, since at least two temperature control units 44 are arranged in the first connecting pipe 40 as described above, (meth)acrylic acid is Cooling of the methyl-containing gas can be performed immediately after it is extracted from the pyrolysis apparatus 10, as a result of which ignition explosion caused by the methyl (meth)acrylate gas can be effectively prevented, and then Since the cooled gas containing methyl (meth)acrylate is heated by the second temperature control unit 44B, the undecomposed resin (undecomposed component) accompanying the gas containing methyl (meth)acrylate (gas state) 2) The mist is cooled in the first connecting pipe 40 and clogging due to solidification (sticking), the pyrolysis gas is cooled and enters the polymerization temperature range, clogging due to polymerization and solidification, and further ignition explosion. can be effectively prevented.

(3) Residue Storage Device The residue storage device 30 is connected to the thermal decomposition device 10 by a connecting pipe 20 (pipe portion 22). Specifically, the residue discharge part 16 of the thermal decomposition device 10 and the storage tank 32 of the residue storage device 30 are connected by the connecting pipe 20 .

That is, the residue storage device 30 is provided so as to contact a storage tank 32 connected to the residue discharge section 16 and the connecting pipe 20, and the outer surface of the storage tank 32, and the stored undecomposed components are removed. A cooling unit 39 for cooling the residue containing and has a gas discharge part 36 for discharging gas to the outside of the storage tank 32, or is connected to the storage tank 32 and has a cooling water supply for supplying cooling water into the storage tank 32 It has a portion 38 .

The configuration, material, size, and the like of the storage tank 32 included in the residue storage device 30 are not particularly limited, provided that the residue containing undecomposed components can be accommodated and stored. The storage tank 32 can be configured by, for example, a sealable container-like member such as any conventionally known suitable drum that is available on the market.

In this embodiment, the residue storage device 30 preferably has a cooling section 39, a second inert gas supply section 34, and a gas discharge section 36, or has a cooling water supply section 38. , in addition to the cooling portion 39 , the second inert gas supply portion 34 and the gas discharge portion 36 , a cooling water supply portion 38 may be provided.

In this embodiment, the residue storage device 30 preferably has a cooling section 39 , a second inert gas supply section 34 and a gas discharge section 36 .

The cooling unit 32 is provided in contact with the outer surface of the storage tank 32 and is a functional unit for cooling the stored residue containing undecomposed components.

Specifically, as the cooling unit 32, it is preferable to use any conventionally known suitable jacket that allows a medium (refrigerant) to flow therein.

The second inert gas supply unit 34 is a functional unit that can supply inert gas into the storage tank 32 in which the residue containing undecomposed components is stored.

The second inert gas supply unit 34 can adopt any conventionally known and suitable configuration including cylinders, pumps, piping, etc., provided that it has a function of supplying inert gas to the storage tank 32. .

A mode in which the second inert gas supply unit 34 is provided is not particularly limited. The second inert gas supply unit 34 may be configured to supply the inert gas from any region such as the top, bottom, or side of the storage tank 32 . It is preferable that the second inert gas supply unit 34 can supply the inert gas from the top of the storage tank 32 .

The type, amount, etc. of the inert gas supplied into the storage tank 32 by the second inert gas supply unit 34 are not particularly limited. In this embodiment, it is preferable to use nitrogen gas as the inert gas from the viewpoint of availability.

The gas discharge part 36 is a functional part for discharging gas from the storage tank 32 in which the residue containing undecomposed components is stored and stored to the outside of the storage tank 32 .

Here, the "gas" includes flammable, combustible, and explosive gases. The generated gas, such as methyl (meth)acrylate, which could not be taken out from the gas extraction part 14, and the inert gas supplied into the storage tank 32 by the second inert gas supply part 34 can be included.

The gas discharge part 36 can employ any conventionally known and suitable configuration including a pump and piping, provided that it has a function of discharging gas from the storage tank 32 .

The gas discharge part 36 may be configured to discharge the gas inside the storage tank 32 from any region such as the top, bottom, or side of the storage tank 32 . In this embodiment, the gas discharge part 36 is preferably a functional part capable of discharging gas from the top of the storage tank 32 .

The gas outlet 36 may be connected to any suitable further gas treatment facility (gas treatment device) known in the art. Examples of gas processing equipment include incinerators, flare stacks, dilution equipment, and the like.

In this embodiment, the residue storage device 30 may include a cooling water supply section 38 . The cooling water supply unit 38 supplies cooling water into the storage tank 32 to cool the residue containing undecomposed components stored in the storage tank 32 by bringing the cooling water (water) into direct contact with the residue. It is a functional part that can

The cooling water supply unit 38 can employ any conventionally known and suitable configuration including a pump and piping, provided that cooling water can be supplied to the storage tank 32 .

According to the regeneration system 1 of the present embodiment, the cooling unit 39, the second inert gas supply unit 34, and the gas discharge unit 36 configured as described above are provided, or the cooling water supply unit 38 is Therefore, the residue containing undecomposed components can be stored more safely in the residue storage device 30, and unintended ignition and explosion in the residue storage device 30 can be prevented more effectively.

(4) First trapping tank In this embodiment, the first trapping tank 52 is connected to the gas extractor 14 of the pyrolyzer 10 by the already-described first connecting pipe 40, and is a (meta) tank. This is a configuration for introducing a gas containing methyl acrylate and capturing and removing residues containing undecomposed components contained in the gas containing methyl (meth)acrylate.

The first capture tank 52 has a first temperature control section 52A. The first temperature control unit 52A adjusts the temperature of the gas containing methyl (meth)acrylate derived from the thermal decomposition apparatus 10 to above the softening point of the (meth)acrylic resin composition and to the ignition point of methyl (meth)acrylate. It is a functional part that can extract and store the residue containing undecomposed components contained in the gas containing methyl (meth)acrylate as a molten residue by keeping it warm or heating it to a temperature of less than.

In this embodiment, the first temperature control section 52A is provided so as to come into contact with the outer surface of the first capture tank 52 .

Specific examples of the first temperature control unit 52A include a jacket, an electric heater, and a heat insulating material through which a medium (heat medium) can be circulated.

In this embodiment, the regeneration system 1 comprises a first residue lead-out connecting pipe 82 that connects the first capture tank 52 and the storage tank 32 of the residue storage device 30 already described.

The first residue lead-out connecting pipe 82 is a functional part for leading out the molten (liquid) residue containing the undecomposed components captured and separated in the first capture tank 52 to the storage tank 32. .

The first residue lead-out connecting pipe 82 has a first residue on-off valve 82A for adjusting the flow (flow rate) of the liquid residue containing undecomposed components in the middle of its entire length. there is

The configuration of the first residue on-off valve 82A is not particularly limited. For the first residue on-off valve 82A, any conventionally known suitable on-off valve (valve) such as a stainless steel ball valve can be adopted.

The first residue lead-out connecting pipe 82 further includes a temperature control section 83 provided so as to be in contact with the outer surface of the first residue lead-out connecting pipe 82 . The temperature control unit 83 is a functional unit for controlling the temperature of the residue containing undecomposed components drawn out from the first trapping tank 52 .

The temperature control unit 83 is a functional unit that can control the temperature of the first residue lead-out connecting pipe 82 to a temperature equal to or higher than the softening point of the residue containing undecomposed components and lower than the ignition point. More specifically, the temperature control section 83 is a functional section for heating, keeping warm, or cooling the residue containing undecomposed components flowing through the first residue lead-out connecting pipe 82 .

As the temperature control unit 83, a conventionally known arbitrary suitable configuration can be applied. Specifically, at least one selected from the group consisting of a jacket, a double-tube heat exchanger, an electric heater, and a heat insulating material, which can circulate a medium (heat medium) inside, is used as the temperature control unit 83. can be applied.

When the temperature control unit 83 is composed of two or more members, for example, a combination of a double-tube heat exchanger and a heat insulating material, at least one member is outside the first residue lead-out connecting pipe 82. It is sufficient that they are in contact with the surface, in other words, two or more types of members may be provided so as to be laminated on the outer surface of the first residue-leading connecting pipe 82 .

The installation mode of the temperature control unit 83 is not particularly limited, provided that the temperature of the residue of the undecomposed components flowing through the first residue lead-out connecting pipe 82 can be effectively controlled. The temperature control unit 83 can be provided, for example, so as to cover the circumference of the first residue-leading connecting pipe 82 without interruption.

In this embodiment, it is preferable to use a double tube heat exchanger as the temperature control unit 83 . The double-tube heat exchanger is preferably a double-tube heat exchanger using steam as a heat medium.

Moreover, when the temperature control unit 83 includes a heat insulating material, the heat insulating material is preferably at least one selected from the group consisting of rock wool, glass wool, calcium silicate, and water-repellent perlite.

According to the regeneration system 1 of the present embodiment, since the first residue lead-out connecting pipe 82 is provided with the temperature control section 83, the residue containing the undecomposed components flowing through the first residue lead-out connecting pipe 82 adheres. It is possible to effectively prevent clogging of the first residue lead-out connecting pipe 82 and further ignition explosion due to .

In the regeneration system 1 of the present embodiment, the connecting pipe 20 and the first residue deriving connecting pipe 82 are connected to the same storage tank 30, but the connecting pipe 20 and the first residue deriving connecting pipe 82 may each be connected to a separate storage tank 30 (note that the second storage tank is not shown in FIG. 1).

(5) Gas Treatment Apparatus In this embodiment, the regeneration system 1 includes a gas treatment apparatus 70 connected to the first trapping tank 52 by the second connecting pipe 60 . The gas treatment device 70 is a gas containing methyl (meth)acrylate generated by pyrolyzing the scrap introduced into the pyrolysis device 10 and extracted from the gas extraction unit 14 via the first capture tank 52. It is a functional unit for processing gas containing methyl (meth)acrylate.

In the present embodiment, the gas treatment device 70 takes into account the composition, temperature, etc. of the gas containing methyl (meth)acrylate generated by the thermal decomposition process of the thermal decomposition device 10 and processed in the first capture tank 52. It is possible to apply any conventionally known and suitable device selected corresponding to the necessary processing determined by the method.

As the gas treatment device 70, for example, the gas containing methyl (meth)acrylate extracted from the pyrolysis device 10 and treated in the first trapping tank 52 and further in the second trapping tank 54 to be described later is purified. and a cooler for cooling the gas containing methyl (meth)acrylate. As the gas treatment device 70, it is preferable to apply a gas treatment device including at least one selected from the group consisting of a purifier and a cooler.

In the present embodiment, the average inner diameter of the first connecting pipe 40 already described is made larger than the average inner diameter of the second connecting pipe 60 because the flow velocity of the undecomposed components can be reduced and the entrainment can be reduced. preferably. Here, the "average value" refers to, for example, a numerical value obtained by subjecting numerical values measured at a plurality of locations to predetermined statistical processing according to a conventional method.

2. Recycling method The recycling method of methyl (meth)acrylate of the present embodiment is the recycling method of methyl (meth)acrylate using the recycling system 1 according to the already described first embodiment, in which scrap is removed by the thermal decomposition device 10. a pyrolysis step of pyrolyzing to generate a gas containing methyl (meth)acrylate;
The gas containing methyl (meth)acrylate is introduced into the first capture tank 52 to capture the residue containing the undecomposed components contained in the gas containing methyl (meth)acrylate, and the liquid containing the undecomposed components is collected. A removal step of removing as a residue in the form of
The gas containing methyl (meth)acrylate processed by the first capture tank 52 is led out of the first capture tank 52 by a second connecting pipe 60 and selected from the group consisting of a purifier and a cooler. and a treatment step of introducing into the gas treatment device 70 for treatment.

In the case of adjusting to the assumed "temperature equal to or higher than the boiling point of the gas containing methyl (meth)acrylate and lower than the ignition point", the temperature of the "boiling point" is about 100 ° C. Moreover, since the temperature of the "ignition point" is about 421° C., the temperature should be adjusted so as to be lower than this temperature.

Specifically, the temperature of the gas containing methyl (meth)acrylate after being adjusted to “a temperature equal to or higher than the boiling point and less than the ignition point of the gas containing methyl (meth)acrylate” is, for example, 100° C. to 420° C. °C, more preferably 200°C to 410°C, even more preferably 300°C to 400°C.

In the first temperature control section 44A, the temperature of the gas containing methyl (meth)acrylate, which is led out from the pyrolysis apparatus 10 and flows through the tube section 42, that is, the first connecting tube 40, is adjusted to the temperature of (meth)acrylic acid. It is adjusted, ie cooled, to a temperature above the boiling point and below the ignition point of the methyl-containing gas.

The temperature of the gas containing methyl (meth)acrylate after being adjusted to “a temperature equal to or higher than the boiling point and less than the ignition point” of the gas containing methyl (meth)acrylate in the first temperature control unit 44A is specifically is, for example, preferably 100°C to 420°C, more preferably 200°C to 410°C, even more preferably 300°C to 400°C.

In the second temperature control section 44B, the temperature of the gas containing methyl (meth)acrylate derived from the thermal decomposition apparatus 10 and flowing through the tube section 42, i. adjusted, ie heated, to a temperature below the point.

Specifically, the temperature of the gas containing methyl (meth)acrylate after being adjusted to “a temperature equal to or higher than the boiling point and less than the ignition point of the gas containing methyl (meth)acrylate” in the second temperature control unit 44B is is, for example, preferably 100°C to 420°C, more preferably 200°C to 410°C, and even more preferably 300°C to 400°C.

Methyl (meth)acrylate (sometimes referred to as recycled methyl (meth)acrylate or recovered methyl (meth)acrylate) recycled and recovered by the recycling method of the present embodiment includes methyl isobutyrate and methyl propionate. , and methyl acrylate. Recycled methyl (meth)acrylate (before performing a purification step or the like) that may contain such impurities is sometimes referred to as a methyl (meth)acrylate product.

Hereinafter, the steps included in the method for regenerating methyl (meth)acrylate of the present embodiment will be specifically described. In addition, in the following description, an example in which an extruder is adopted as the thermal decomposition device 10 is assumed.

(1) Thermal decomposition step The thermal decomposition step is a step of thermally decomposing (depolymerizing) scrap in the thermal decomposition apparatus 10 to generate a gas containing methyl (meth)acrylate (and a residue containing undecomposed components). be.

In the present embodiment, the implementation conditions of the pyrolysis step (for example, pressure (MPa), cylinder temperature (° C.), screw rotation speed (rpm), scrap supply amount (raw material supply rate) (kg / hour)) are not particularly limited. . The conditions for carrying out the pyrolysis step can be any suitable conditions, for example, in consideration of the properties, composition, etc. of the scrap to be treated.

The pressure in the thermal decomposition step of the present embodiment is preferably 0.005 MPa to 1.5 MPa, more preferably 0, from the viewpoint of preventing air from leaking into the system and cracked gas from leaking out of the system. 0.01 MPa to 0.3 MPa.

From the viewpoint of thermal decomposition efficiency, the cylinder temperature in the thermal decomposition step of the present embodiment is usually 400° C. to 500° C. For example, when the scrap is pure poly(methyl meth)acrylate, it is preferably 450°C to 470°C.

From the viewpoint of stable operation of the extruder, the screw rotation speed in the thermal decomposition step of the present embodiment is usually 500 rpm to 1500 rpm, and for example, when the scrap is pure poly(methyl)acrylate, it is preferable. is between 500 rpm and 1000 rpm.

The amount of scrap supplied in the pyrolysis step of the present embodiment varies depending on the diameter of the cylinder, and is usually 10 kg/hour to 5000 kg/hour. It's time.

(2) Removal Step In the removal step, the gas containing methyl (meth)acrylate is introduced into the first trapping tank 52 to trap residues containing undecomposed components contained in the gas containing methyl (meth)acrylate. and remove it as a liquid residue containing undecomposed components.

In carrying out the removal step, the gas containing methyl (meth)acrylate generated in the thermal decomposition device 10 is led out to the first connecting pipe 40 .

In the present embodiment, the temperature of the gas containing methyl (meth)acrylate led out from the thermal decomposition apparatus 10 to the first connecting pipe 40 is adjusted by the temperature controller 44 . Specifically, the gas containing methyl (meth)acrylate derived from the thermal decomposition apparatus 10 is first cooled by the first temperature control section 44A and then kept warm or heated by the second temperature control section 44B. Later, it is introduced into the first catch tank 52 .

By introducing the gas containing methyl (meth)acrylate into the first trapping tank 52 in this way, the undecomposed components contained in the gas containing methyl (meth)acrylate introduced into the first trapping tank 52 can be removed. Since the flow velocity is lowered, the undecomposed components can be captured more effectively, and clogging due to solidification (sticking) caused by the undecomposed components and ignition and explosion due to gas containing methyl (meth)acrylate can be prevented.

The removal step for the gas containing methyl (meth)acrylate introduced into the first trapping tank 52 is performed by the first temperature control section 52A provided in the first trapping tank 52 . Specifically, the gas containing methyl (meth)acrylate introduced into the first trapping tank 52 is adjusted to the temperature of the gas containing methyl (meth)acrylate by the first temperature control unit 52A. By keeping or heating to a temperature above the softening point of the composition and below the ignition point of methyl (meth)acrylate, the captured residue is converted to a liquid state, thereby separating it as a liquid residue containing undecomposed components. and can be stored in the first capture tank 52 .

As a result, the concentration of "residue containing undecomposed components" that may be contained in the gas containing methyl (meth)acrylate introduced into the first capture tank 52 can be reduced or removed.

According to the regeneration system of the present embodiment, the residue containing undecomposed components can be more effectively removed from the gas containing methyl (meth)acrylate by the first capture tank 52, so when the gas is derived from the thermal decomposition apparatus, It is possible to effectively prevent clogging of the distribution route in and further ignition explosion.

(3) Treatment Step In the treatment step, the gas containing methyl (meth)acrylate that has been treated in the first trapping tank 52 in the removal step is discharged from the first trapping tank 52 through the second connecting pipe 60. and introducing it into a gas treatment unit 70 selected from the group consisting of a purifier and a cooler for treatment.

In this embodiment, the conditions for carrying out the treatment process by the gas treatment device 70 are not particularly limited. The processing mode (cooling, purification, etc.) by the gas processing device 70 and the implementation conditions of the processing steps are determined by the properties, composition, temperature, etc. of the gas that is processed in the first trapping tank 52 and discharged from the first trapping tank 52. Any suitable aspect and conditions can be taken into consideration.

(4) Storage step The storage step is a step of discharging the residue containing undecomposed components generated in the thermal decomposition step from the residue discharge unit 16 of the thermal decomposition device 10 and introducing it into the residue storage device 30. The removal has already been described. The liquid residue containing the undecomposed components removed by the process is introduced from the first capture tank 52 into the residue storage device 30, and the residue containing the undecomposed components introduced into the residue storage device 30 is cooled by the cooling unit 39. This is a step of storing while cooling.

The liquid residue containing the undecomposed components removed by the removal step as described above is introduced from the first capture tank 52 into the residue storage device 30 . This introduction is performed via the first residue lead-out connecting pipe 82 connecting the first capture tank 52 and the storage tank 32 of the residue storage device 30 . Specifically, first, liquid residue containing undecomposed components is stored in the first capture tank 52 with the first residue on-off valve 82A provided in the residue lead-out connecting pipe 82 closed, and then By opening the first residue on-off valve 82A, the liquid residue containing undecomposed components stored in the first capture tank 52 can be led out to the residue storage tank 32 .

In the storage step of the present embodiment, cooling of the residue containing undecomposed components (which may include components generated by thermal decomposition such as methyl (meth)acrylate) by the cooling unit 39 is performed by igniting the residue containing undecomposed components. This is done under the condition that it can be cooled to a temperature below the temperature of the point. Specifically, for example, the "temperature of the ignition point of the residue containing the undecomposed components" assumed in the present embodiment is about 421° C., so the cooling conditions for the cooling unit 32A (medium temperature, flow rate, etc.) may be adjusted.

In this embodiment, the storage step is performed by supplying an inert gas to the storage tank 32 from the inert gas supply unit 34 and discharging the gas out of the storage tank 32 from the gas discharge unit 36, or by performing residue storage. It is preferable that the step be performed by supplying cooling water into the tank 32 from the cooling water supply unit 38 .

The inert gas supply condition by the inert gas supply unit 34 or the cooling water supply condition by the cooling water supply unit 38 is determined by the properties, composition, temperature, It may be determined in consideration of the amount, shape, size, etc. of the storage tank 32, and is not particularly limited as long as the residue containing undecomposed components can be cooled to the temperature of the ignition point.

The connecting pipe 20 includes a pipe portion 22 for circulating the residue containing undecomposed components and a temperature control portion 24 for heating, keeping warm or cooling the residue containing undecomposed components derived from the thermal decomposition apparatus 10. Therefore, in the storage step, the temperature of the residue containing undecomposed components flowing through the connecting pipe 20 is adjusted by the temperature control unit 24 to a temperature equal to or higher than the softening point of the residue containing undecomposed components and lower than the ignition point. is.

The first residue lead-out connecting pipe 82 heats and heats the residue including the undecomposed components drawn from the first residue lead-out connecting pipe 82 for circulating the residue containing the undecomposed components and the first capture tank 52. Alternatively, it includes a temperature control section 83 for cooling. Therefore, in the storage step, the temperature control unit 83 adjusts the temperature of the residue containing undecomposed components flowing through the first residue lead-out connecting pipe 82 to a temperature equal to or higher than the softening point of the residue containing undecomposed components and lower than the ignition point. It is a controlled process.

Specifically, for example, since the "softening point temperature of the residue containing undecomposed components" assumed in the present embodiment is about 110° C., the The temperature of the ignition point of the residue containing" is about 421 ° C. as described above, so the cooling conditions (medium temperature, flow velocity, etc.) by the cooling unit 39 are adjusted so that the residue containing undecomposed components is kept below this temperature. Derivation from the pyrolyzer 10 may be performed.

According to the method for regenerating methyl (meth)acrylate of the present embodiment, the residue containing undecomposed components can be more effectively removed by the first trapping tank 52. Therefore, the distribution route in the case of deriving from the thermal decomposition apparatus. clogging and further ignition explosion can be effectively prevented, and methyl (meth)acrylate can be regenerated safely and efficiently.

<Second embodiment>
1. Reproduction System A reproduction system according to the second embodiment will be described with reference to FIG. FIG. 2 is a schematic diagram showing a configuration example of a playback system according to the second embodiment.

The regeneration system 1 of the second embodiment includes a second trap tank 54 connected downstream of the first trap tank 52 and a first inert gas tank connected to the second trap tank 54. A supply unit 56 is further provided.

Components other than the second trapping tank 54 and the first inert gas supply unit 56, and the connecting pipe for connecting them are in principle the same as those of the first component, so only the difference will be described. and detailed description thereof may be omitted. Also, the pyrolyzer 10, the connecting pipe 20, and the first pipe 40 are the same as those of the pyrolyzer 10 shown in FIG. 1, so illustration and description are omitted.

As shown in FIG. 2, the playback system 1 of the second embodiment includes:
A second residue lead-out connecting pipe 84 for leading out the liquid residue containing undecomposed components from the first capture tank 52, and for adjusting the flow of the liquid residue containing undecomposed components. It is connected to the first capture tank 52 by a second residue lead-out connecting pipe 84 equipped with a second residue on-off valve 84A, and the liquid containing undecomposed components led out from the first capture tank 52 further comprising a second capture tank 54 for introducing residue and further extracting gas containing methyl (meth)acrylate to capture liquid residue containing undecomposed components;
A residue storage tank 30 is connected to the second capture tank 54 for storing liquid residue containing undecomposed components captured in the second capture tank 54 from the second capture tank 54 to the third capture tank 54 . is a storage tank 32 for storing the liquid residue containing undecomposed components led out by the residue lead-out connecting pipe 86, and the liquid residue containing undecomposed components is led out from the second capture tank 54. A third residue lead-out connecting pipe 86 for A connected playback system.

Components that can configure the reproduction system 1 of the second embodiment will be specifically described below.

(1) Second capture tank In this embodiment, the second capture tank 54 introduces the liquid residue containing the undecomposed components derived from the first capture tank 52 and contains the undecomposed components. It is a configuration for storing liquid residue and safely introducing it into a residue storage device for removal. The second catch tank 54 can be configured similarly to the first catch tank 52 .

That is, the second capture tank 54 has a second temperature control section 54A. The second temperature control unit 54A adjusts the temperature of the liquid residue containing undecomposed components drawn from the first capture tank 52 to a temperature equal to or higher than the softening point of the (meth)acrylic resin composition and A function of retaining or heating to a temperature below the ignition point of methyl acid to extract a gas containing methyl (meth)acrylate and, as a result, storing a liquid residue containing residual undecomposed components. Department.

In this embodiment, the second temperature control section 54A is provided so as to come into contact with the outer surface of the second capture tank 54 .

As the second temperature control unit 54A, specifically, it is preferable to use any conventionally known suitable jacket that allows a medium (heat medium) to flow therein.

(2) First inert gas supply unit The first inert gas supply unit 56 is a functional unit capable of supplying inert gas into the second capture tank 54 .

The first inert gas supply unit 56 adopts any conventionally known and suitable configuration including cylinders, pumps, piping, etc., provided that it has a function of supplying inert gas to the second capture tank 54. be able to.

A mode in which the first inert gas supply unit 56 is provided is not particularly limited. The first inert gas supply section 56 may be configured to supply the inert gas from any region such as the top, bottom, or side of the second trapping tank 54 . It is preferable that the first inert gas supply unit 56 be configured to supply the inert gas from the top of the second capture tank 54 .

The type, amount, etc. of the inert gas supplied into the second trapping tank 54 by the first inert gas supply unit 56 are not particularly limited. In this embodiment, it is preferable to use nitrogen gas as the inert gas from the viewpoint of availability.

The first inert gas supply unit 56 can also be configured as a single piece of equipment in common with the second inert gas supply unit 34 already described.

The first inert gas supply section 56 is connected to the second capture tank 54 by the first inert gas connecting pipe 55 .

The first inert gas connection pipe 55 has a first inert gas on-off valve 55A for adjusting the flow (flow rate) of the inert gas in the middle of its entire length.

The configuration of the first inert gas on-off valve 55A is not particularly limited. For the second residue on-off valve 84A, any conventionally known suitable on-off valve (valve) such as a stainless steel ball valve can be adopted.

The second trapping tank 54 is connected to the first trapping tank 52 by a second residue lead-out connecting pipe 84 for leading out liquid residue containing undecomposed components from the first trapping tank 52 . .

The second residue lead-out connecting pipe 84 has a second residue on-off valve 84A for adjusting the flow (flow rate) of the liquid residue containing undecomposed components in the middle of its length. there is

The configuration of the second residue on-off valve 84A is not particularly limited. For the second residue on-off valve 84A, any conventionally known suitable on-off valve (valve) such as a stainless steel ball valve can be adopted.

The second residue lead-out connecting pipe 84 further includes a temperature control section 85 provided so as to come into contact with the outer surface. The temperature control section 85 is a functional section for controlling the temperature of the residue containing undecomposed components drawn out from the first trapping tank 52 .

The temperature control unit 85 is a functional unit that can control the temperature of the second residue lead-out connecting pipe 84 to a temperature equal to or higher than the softening point of the residue containing undecomposed components and lower than the ignition point. More specifically, the temperature control section 85 is a functional section for heating, keeping warm, or cooling the residue containing undecomposed components flowing through the second residue lead-out connecting pipe 84 .

As the temperature control unit 85, a conventionally known arbitrary suitable configuration can be applied. Specifically, at least one selected from the group consisting of a jacket, a double-tube heat exchanger, an electric heater, and a heat insulating material, which can circulate a medium (heat medium) inside, is used as the temperature control unit 85. can be applied.

Note that when the temperature control unit 85 is composed of two or more members such as a combination of a double-tube heat exchanger and a heat insulating material, at least one member is outside the second residue lead-out connecting pipe 84. It is sufficient that they are in contact with the surface, in other words, two or more types of members may be provided so as to be laminated on the outer surface of the second residue-leading connecting pipe 84 .

The installation mode of the temperature control unit 85 is not particularly limited, provided that the temperature of the residue of the undecomposed components flowing through the second residue lead-out connecting pipe 84 can be effectively controlled. The temperature control part 85 can be provided, for example, so as to cover the outer circumference of the second residue lead-out connecting pipe 84 without interruption.

In this embodiment, it is preferable to use a double tube heat exchanger as the temperature control unit 85 . The double-tube heat exchanger is preferably a double-tube heat exchanger using steam as a heat medium.

Moreover, when the temperature control unit 85 includes a heat insulating material, the heat insulating material is preferably at least one selected from the group consisting of rock wool, glass wool, calcium silicate, and water-repellent perlite.

The second trapping tank 54 is further connected to the first trapping tank 52 by a second inert gas connecting pipe 58 for leading out the gas containing methyl (meth)acrylate from the first trapping tank 52 . ing.

The second inert gas connection pipe 58 has a second inert gas on-off valve 58A for adjusting the distribution (flow rate) of the gas containing methyl (meth)acrylate in the middle of its length. It has

The configuration of the second inert gas on-off valve 58A is not particularly limited. For the second inert gas on-off valve 84A, any conventionally known suitable on-off valve (valve) such as a stainless steel ball valve can be adopted.

In the second embodiment, the regeneration system 1 includes the second capture tank 54 and the storage tank 32 of the residue storage device 30 already described, instead of the first residue lead-out connecting pipe 82 in the first embodiment. A third connecting pipe 86 for leading out residue is provided.

The third residue lead-out connecting pipe 86 feeds the liquid residue containing undecomposed components introduced from the first capture tank 52 in the second capture tank 54 and the liquid residue containing undecomposed components in the second capture tank. It is a functional part for leading out the captured and separated liquid residue containing undecomposed components to the storage tank 32 .

The third residue lead-out connecting pipe 86 has a third residue on-off valve 86A for adjusting the flow (flow rate) of liquid residue containing undecomposed components in the middle of its length. there is

The configuration of the third residue on-off valve 86A is not particularly limited. For the third residue on-off valve 86A, any conventionally known suitable on-off valve (valve) such as a stainless steel ball valve can be adopted.

The third residue lead-out connecting pipe 86 further includes a temperature control section 87 provided so as to come into contact with the outer surface. The temperature adjustment section 87 is a functional section for adjusting the temperature of the residue containing undecomposed components drawn out from the second trapping tank 54 .

The temperature control unit 87 is a functional unit that can control the temperature of the third residue lead-out connecting pipe 86 to a temperature above the softening point and below the ignition point of the residue containing undecomposed components. More specifically, the temperature control section 87 is a functional section for heating, keeping warm, or cooling the residue containing undecomposed components flowing through the third residue lead-out connecting pipe 86 .

As the temperature control unit 87, a conventionally known arbitrary suitable configuration can be applied. Specifically, at least one selected from the group consisting of a jacket, a double-tube heat exchanger, an electric heater, and a heat insulating material, which is capable of circulating a medium (heat medium) inside, is used as the temperature control unit 87. can be applied.

When the temperature control unit 87 is composed of two or more types of members, for example, a combination of a double-tube heat exchanger and a heat insulating material, at least one type of member is outside the third residue lead-out connecting pipe 86. It is sufficient that they are in contact with the surface. In other words, two or more members may be provided so as to be laminated on the outer surface of the third residue-leading connecting pipe 86 .

The installation mode of the temperature control unit 87 is not particularly limited, provided that the temperature of the residue of the undecomposed components flowing through the third residue lead-out connecting pipe 86 can be effectively controlled. The temperature control part 87 can be provided, for example, so as to cover the outer periphery of the third residue lead-out connecting pipe 86 without interruption.

In this embodiment, it is preferable to use a double tube heat exchanger as the temperature control unit 87 . The double-tube heat exchanger is preferably a double-tube heat exchanger using steam as a heat medium.

Moreover, when the temperature control unit 87 includes a heat insulating material, the heat insulating material is preferably at least one selected from the group consisting of rock wool, glass wool, calcium silicate, and water-repellent perlite.

In the regeneration system 1 of the second embodiment, the connecting pipe 20 and the first residue deriving connecting pipe 82 are connected to the same storage tank 30, but the connecting pipe 20 and the first residue deriving connecting pipe 82 may each be connected to a separate storage tank 30 (the second storage tank 30 is not shown in FIG. 2).

According to the regeneration system of the present embodiment, by further providing the second capture tank 54, the residue containing the undecomposed components can be safely stored and removed safely even during operation. It is possible to effectively prevent clogging of distribution channels and further ignition and explosion.

2. Regeneration Method The method for regenerating methyl (meth)acrylate of the present embodiment is similar to the method of regenerating methyl (meth)acrylate using the regeneration system 1 according to the already described second embodiment,
a pyrolysis step of pyrolyzing scrap by a pyrolyzer 10 to generate a gas containing methyl (meth)acrylate;
The gas containing methyl (meth)acrylate is introduced into the first capture tank 52 via the first connecting pipe 40 to capture the residue containing the undecomposed components contained in the gas containing methyl (meth)acrylate. a removal step of removing as a liquid residue containing undecomposed components;
The gas containing methyl (meth)acrylate processed by the first capture tank 52 is led out of the first capture tank 52 by a second connecting pipe 60 and selected from the group consisting of a purifier and a cooler. a treatment step of introducing into the gas treatment device 70 for treatment;
With the third residue on-off valve 87A closed, the second residue on-off valve 84A is opened, and with the first inert gas supply valve 55A closed, the second inert gas on-off valve 58A is opened. By opening, the (liquid) residue containing the undecomposed components is led out from the first capture tank 52 to the second capture tank 54 through the second residue lead-out connecting pipe 84, and the residue containing the undecomposed components is discharged. A temporary storage step of storing the
By opening the first inert gas on-off valve 55A and the second inert gas on-off valve 58A with the second residue on-off valve 84A and the third residue on-off valve 86A closed, the first The inert gas supplied from the inert gas supply unit 56 is circulated from the second trapping tank 54 to the first trapping tank 52, and the combustible gas filling the second trapping tank is converted into the inert gas. a storage preparation step of replacing and preparing for detoxification and storage in the second capture tank;
With the second residue on-off valve 84A and the second inert gas on-off valve 58A closed, the third residue on-off valve 86A is opened and the first inert gas on-off valve 55A is opened. a storage step of discharging and introducing the liquid residue containing undecomposed components from the second capture tank 54 into the residue storage device 30 through the third residue lead-out connection pipe 86 having the third residue on-off valve 86A; including.

Hereinafter, the steps included in the method for regenerating methyl (meth)acrylate of the present embodiment will be specifically described. In addition, in the following description, as in the already described first embodiment, an example in which an extruder is adopted as the thermal decomposition device 10 is assumed.

(1) Thermal decomposition step The thermal decomposition step is a step of thermally decomposing (depolymerizing) scrap in the thermal decomposition apparatus 10 to generate a gas containing methyl (meth)acrylate (and a residue containing undecomposed components). be.

In the present embodiment, the implementation conditions of the pyrolysis step (for example, pressure (MPa), cylinder temperature (° C.), screw rotation speed (rpm), scrap supply amount (raw material supply rate) (kg / hour)) are not particularly limited. . The conditions for carrying out the pyrolysis step can be any suitable conditions, for example, in consideration of the properties, composition, etc. of the scrap to be treated.

The pressure and cylinder temperature in the pyrolysis step of this embodiment can be set in the same manner as in the already described first embodiment with respect to the screw rotation speed and scrap supply amount.

(2) Removal step In the removal step, the gas containing methyl (meth)acrylate is introduced into the first capture tank 52 through the first connecting pipe 40, and the gas contained in the gas containing methyl (meth)acrylate is This is a step of capturing residues containing undecomposed components and removing them as (liquid) residues containing undecomposed components.

In carrying out the removal step, the gas containing methyl (meth)acrylate generated in the thermal decomposition apparatus 10 is led out to the pipe portion 42 , that is, the first connecting pipe 40 .

In the second embodiment, similarly to the first embodiment, the temperature of the gas containing methyl (meth)acrylate led out from the thermal decomposition apparatus 10 to the first connecting pipe 40 is adjusted by the temperature control unit 44 to adjusted. Specifically, the gas containing methyl (meth)acrylate derived from the thermal decomposition apparatus 10 is first cooled by the first temperature control section 44A, then heated by the second temperature control section 44B, and then It is introduced into the first catch tank 52 .

The step of removing undecomposed components from the gas containing methyl (meth)acrylate introduced into the first trapping tank 52 is performed by the first trapping tank 52 . Specifically, in the removal step, the gas containing methyl (meth)acrylate introduced into the first trapping tank 52 is introduced into the first trapping tank 52 to remove undecomposed components (in the form of mist). In this step, the flow velocity of the gas containing the undecomposed components is lowered to cause the undecomposed components to settle, thereby separating the liquid residues containing the undecomposed components and storing them in the first capture tank 52 .

As a result, the concentration of "residue containing undecomposed components" that may be contained in the gas containing methyl (meth)acrylate introduced into the first capture tank 52 can be reduced or removed.

(3) Treatment process In the treatment process, the gas containing methyl (meth)acrylate treated by the first capture tank 52 is led out from the first capture tank 52 via the second connecting pipe 60, and and a cooler to introduce it into a gas treatment device 70 for treatment.

In this embodiment, the conditions for carrying out the treatment process by the gas treatment device 70 are not particularly limited. The processing mode (concentration, purification, etc.) by the gas processing device 70 and the implementation conditions of the processing steps are determined by the properties, composition, temperature, etc. of the gas that is processed in the first capture tank 52 and discharged from the first capture tank 52. Any suitable processing mode and operating conditions can be taken into account.

(4) Temporary storage step In the temporary storage step, the third residue on-off valve 86A is closed, the second residue on-off valve 84A is opened, and the first inert gas supply valve 55A is closed. By opening the second inert gas on-off valve 58A, the liquid residue containing undecomposed components can be circulated, thereby In this step, the liquid residue containing the undecomposed components is led out to the second capture tank 54 and the liquid residue containing the undecomposed components is stored in the second capture tank.

Specifically, in the temporary storage step, first, the third residue on-off valve 86A is closed to stop the liquid residue from flowing from the second capture tank 54 to the storage tank 32, and then the second 2 residue open/close valve 84A and the first inert gas supply valve 55A is closed, the undecomposed components are removed from the first capture tank 52 by opening the second inert gas open/close valve 58A. The liquid residue containing the be able to.

The temporary storage process can be performed by the second temperature control section 54A in the same manner as the already described removal process in the first capture tank 52 .

According to the regeneration method of the second embodiment, the residue containing undecomposed components can be safely stored in a liquid state by the process using the second capture tank 54, so that clogging and ignition due to sticking (solidification) can be more effectively achieved. Explosions can be prevented.

(5) Storage Preparation Step In the storage preparation step, the first inert gas on-off valve 55A and the second inert gas on-off valve 55A are closed while the second residue on-off valve 84A and the third residue on-off valve 86A are closed. By opening the on-off valve 58A, the inert gas supplied from the first inert gas supply unit 56 is allowed to flow from the second trapping tank 54 to the first trapping tank 52, filling the second trapping tank. This is a step of replacing the combustible gas in the second trapping tank with an inert gas to detoxify the inside of the second trapping tank and prepare for storage.

Specifically, first, by closing the second residue on-off valve 84A and the third residue on-off valve 86A, the liquid residue from the first trapping tank 52 to the second trapping tank 54 is and the flow of liquid residue from the second capture tank 54 to the residue storage tank 32, and then close the first inert gas on-off valve 55A and the second inert gas on-off valve 58A. By opening the second trapping tank 54, the inert gas supplied from the first inert gas supply unit 56 is allowed to flow further to the first trapping tank 52, and the second trapping tank 54 is filled with the inert gas. Preparations are made to replace the combustible gas with an inert gas to detoxify the inside of the second trapping tank and discharge it.

Next, the combustible gas filling the second trap tank is introduced from the first trap tank 52 into the gas treatment device 70 through the second connecting pipe 60, and the second trap tank 54 and the first trap tank The combustible gas remaining in 52 is introduced into the gas treatment device 70 together with the inert gas and treated.

Here, the "gas" includes flammable, combustible, and explosive gases in addition to the supplied inert gas. Specifically, methyl (meth)acrylate generated by thermal decomposition Gases that could not be extracted from the gas extractor 14 may also be included.

The conditions for supplying the inert gas by the first inert gas supply unit 56 are such that the gas (combustible gas) remaining in the second trapping tank 54 is reliably introduced into the gas treatment device 70, and the second There is no particular limitation provided that the atmosphere in the supplementary tank 54 and further in the first trapping tank 52 can be replaced with an inert gas.

The treatment of the introduced gas by the gas treatment device 70 can be performed in the same manner as the treatment steps already described.

(6) Storage step In the storage step, after the inside of the second trapping tank 54 is detoxified by the inert gas in the storage preparation step already described, the second residue on-off valve 84A and the second inert gas on-off valve 84A are opened and closed. With the valve 58A closed, the third residue on-off valve 86A is opened, and the first inert gas on-off valve 55A is opened to remove liquid residue containing undecomposed components through the third residue on-off valve. In this step, the residue is stored by being discharged from the second capture tank 54 and introduced into the residue storage device 30 through the third residue lead-out connection pipe 86 having 86A.

Specifically, by closing the second residue opening/closing valve 84A and the second inert gas opening/closing valve 58A, the inflow of the liquid residue from the first capture tank 52 is stopped and separated. Thereafter, the flow path of the liquid residue from the second capture tank 54 to the storage device 30 is released by opening the third residue on-off valve 86A. Next, the inert gas is introduced into the second trapping tank 54 by opening the first inert gas on-off valve 55A to supply the inert gas from the first inert gas supply unit 56 to the second trapping tank 54. The pressure of the applied inert gas pushes out the liquid residue containing the undecomposed components stored in the second trapping tank 54 to the third residue lead-out connecting pipe 86, thereby containing the undecomposed components. The liquid residue is safely introduced into the storage tank 32 of the residue storage device 30 .

The processing of the liquid residue containing undecomposed components introduced by the residue storage device 30 in the storage step, for example, the processing by the cooling unit 39 and the inert gas supply unit 34, is similar to the storage in the already described first embodiment. It can be carried out in the same manner as the process.

The first removal step, the first treatment step, the second removal step, the second treatment step, and the storage step can all be safely carried out in parallel with the thermal decomposition step.

According to the method for regenerating methyl (meth)acrylate of the second embodiment, the residue containing undecomposed components can be safely discharged to the residue storage device 30 and removed by the second capture tank 54 even during operation. Therefore, it is possible to more effectively prevent clogging of distribution channels and ignition and explosion, and to regenerate methyl (meth)acrylate more safely and efficiently. In addition, the liquid residue containing undecomposed components can be easily and safely removed by the on-off valve provided in the connecting pipe and the inert gas.

1 Regeneration System 10 Thermal Decomposition Unit 11 Thermal Decomposition Unit 12 Input Portion 14 Gas Extraction Portion 16 Residue Discharge Portion 20 Connecting Pipe 22 Pipe Portion 24 Temperature Control Unit 30 Residue Storage Device 32 Storage Tank 34 Second Inert Gas Supply Portion 36 Gas Discharge part 38 Cooling water supply part 39 Cooling part 40 First connecting pipe 42 Pipe part 44 Temperature control part 44A First temperature control part 44B Second temperature control part 52 First capture tank 52A First temperature control part 54 Second capture tank 54A Second temperature controller 55 First inert gas connecting pipe 55A First inert gas on-off valve 56 First inert gas supply unit 58 Second inert gas Connection pipe 58A Second inert gas on-off valve 60 Second connection pipe 70 Gas treatment device 82 First residue lead-out connection pipe 83 Temperature control unit 84 Second residue lead-out connection pipe 84A For second residue On-off valve 85 Temperature control unit 86 Third residue lead-out connecting pipe 86A Third residue on-off valve 87 Temperature control unit

Claims (18)

A recycling system for recycling methyl (meth)acrylate from scrap moldings obtained by molding a (meth)acrylic resin composition containing a (meth)acrylic polymer,
A thermal decomposition apparatus having an input section for inputting the scrap and a gas extraction section for extracting a gas containing methyl (meth)acrylate generated by thermal decomposition of the (meth)acrylic resin composition. and,
It is connected to the gas extraction part by a first connecting pipe, introduces the gas containing methyl (meth)acrylate, and captures undecomposed components contained in the gas containing methyl (meth)acrylate. and a first trapping tank for removing undecomposed components as residues, wherein the gas containing methyl (meth)acrylate generated by thermal decomposition of the (meth)acrylic resin composition is a first trapping tank having a temperature control unit capable of retaining and heating to a temperature equal to or higher than the softening point of the acrylic resin composition and lower than the ignition point of the gas containing methyl (meth)acrylate;
a purifier connected to the first capture tank by a second connecting pipe for purifying the gas containing methyl (meth)acrylate processed by the first capture tank; and a (meth)acrylic a gas processor selected from the group consisting of a cooler for cooling said gas containing methyl acid ;
A first residue lead-out connection pipe for leading residue containing undecomposed components from the first capture tank, the first residue lead-out connecting pipe comprising a first residue on-off valve for adjusting the flow of the residue. Storing the residue containing the undecomposed components captured by the first capture tank, which is connected by a residue lead-out connecting pipe and is derived from the first capture tank and containing the undecomposed components a residue storage device comprising a storage tank for
A second residue lead-out connecting pipe for leading out the residue containing undecomposed components from the first capture tank, the second residue lead-out connecting pipe for adjusting the flow of the residue containing undecomposed components It is connected to the first capture tank by a second residue lead-out connecting pipe equipped with an on-off valve, and for introducing and storing the residue containing undecomposed components derived from the first capture tank. further comprising a second capture tank of
wherein said residue storage tank is connected to said second capture tank, said residue containing undegraded components captured in said second capture tank, said residue containing said third residue from said second capture tank; A storage tank for storing the residue containing undecomposed components led out by the lead-out connecting pipe, and a third residue connection for leading out the residue containing undecomposed components from the second capture tank. A regeneration system connected by a third residue outlet connecting pipe having a third residue on-off valve for regulating the flow of said residue containing undecomposed components. 2. The regeneration system of claim 1, wherein the pyrolysis device is an extruder, kneader or fluidized bed heater. 3. The regeneration system of claim 2, wherein said pyrolyzer is an extruder. The second capture tank collects a gas containing methyl (meth)acrylate generated by thermal decomposition of the (meth)acrylic resin composition at a temperature above the softening point of the (meth)acrylic resin composition and (meth) 2.) The regeneration system according to claim 1 , comprising a temperature control unit capable of keeping or heating to a temperature below the ignition point of the gas containing methyl acrylate. At least one of the first to third residue lead-out connecting pipes is a pipe portion for circulating the gas containing methyl (meth)acrylate and for adjusting the temperature of the gas containing methyl (meth)acrylate. 3. The regeneration system of claim 1 , comprising a temperature control unit. a first inert gas supply coupled to the second capture tank for supplying inert gas to the second capture tank;
A first inert gas connection pipe that connects the first inert gas supply unit and the second trapping tank, the first inert gas having a first inert gas on-off valve. connecting pipe for
A second inert gas connecting pipe connecting the first trapping tank and the second trapping tank, the second inert gas connection pipe having a second inert gas on-off valve. 3. The regeneration system of claim 1 , further comprising a connecting tube. A recycling system for recycling methyl (meth)acrylate from scrap moldings obtained by molding a (meth)acrylic resin composition containing a (meth)acrylic polymer,
A thermal decomposition apparatus having an input section for inputting the scrap and a gas extraction section for extracting a gas containing methyl (meth)acrylate generated by thermal decomposition of the (meth)acrylic resin composition. and,
It is connected to the gas extraction part by a first connecting pipe, introduces the gas containing methyl (meth)acrylate, and captures undecomposed components contained in the gas containing methyl (meth)acrylate. and a first trapping tank for removing undecomposed components as residues, wherein the gas containing methyl (meth)acrylate generated by thermal decomposition of the (meth)acrylic resin composition is a first trapping tank having a temperature control unit capable of retaining and heating to a temperature equal to or higher than the softening point of the acrylic resin composition and lower than the ignition point of the gas containing methyl (meth)acrylate;
a purifier connected to the first capture tank by a second connecting pipe for purifying the gas containing methyl (meth)acrylate processed by the first capture tank; and a (meth)acrylic a gas processor selected from the group consisting of a cooler for cooling said gas containing methyl acid;
A first residue lead-out connection pipe for leading residue containing undecomposed components from the first capture tank, the first residue lead-out connecting pipe comprising a first residue on-off valve for adjusting the flow of the residue. Storing the residue containing the undecomposed components captured by the first capture tank, which is connected by a residue lead-out connecting pipe and is derived from the first capture tank and containing the undecomposed components a residue storage device comprising a storage tank for
The residue storage device is provided so as to be in contact with the outer surface of the storage tank, and includes a cooling part for cooling the stored residue and a second for supplying inert gas into the storage tank. 2 inert gas supply unit and a gas discharge unit connected to the storage tank for discharging gas containing inert gas out of the storage tank, or A regeneration system connected thereto and having a cooling water supply for supplying cooling water into said storage tank. 8. The regeneration system of claim 7 , wherein said residue storage device comprises said cooling section, a second inert gas supply and a gas exhaust. 9. The regeneration system of claim 8 , wherein the cooling section includes a jacket through which a refrigerant medium can flow. 10. The regeneration system of claim 9 , wherein said refrigerant is water. The second inert gas supply unit is a functional unit capable of supplying inert gas from the top of the storage tank,
8. The regeneration system of claim 7 , wherein the gas vent is a function capable of venting gas from the top of the storage tank. 8. The regeneration system of claim 7 , wherein said inert gas is nitrogen gas. 4. The first connecting pipe includes a pipe portion for circulating the gas containing methyl (meth)acrylate and a temperature control portion for controlling the temperature of the gas containing methyl (meth)acrylate. 4. The regeneration system according to any one of 1 to 3. The first connecting pipe has at least two temperature control sections, and the first temperature control section arranged closest to the gas extraction section cools the gas containing methyl (meth)acrylate. a temperature control section for 12. The regeneration system of claim 11 , wherein the regeneration system is a temperature control section for heating the gas containing methyl (meth)acrylate. The regeneration system according to any one of claims 1 to 3, wherein the average inner diameter of the first connecting pipe is larger than the average inner diameter of the second connecting pipe. A method for regenerating methyl (meth)acrylate using the regeneration system according to any one of claims 1 to 3,
a pyrolysis step of pyrolyzing the scrap by the pyrolyzer to generate a gas containing methyl (meth)acrylate;
The gas containing methyl (meth)acrylate is introduced into the first capture tank, and the gas containing methyl (meth)acrylate generated by thermal decomposition of the (meth)acrylic resin composition is Residue containing undecomposed components contained in the gas containing methyl (meth)acrylate by keeping and heating to a temperature equal to or higher than the softening point of the acrylic resin composition and lower than the ignition point of the gas containing methyl (meth)acrylate. and removing as a residue containing undecomposed components;
said gas containing methyl (meth)acrylate treated by said first capture tank is led out of said first capture tank through a second connecting pipe, and is selected from the group consisting of a purifier and a cooler; A method for regenerating methyl (meth)acrylate, comprising a treatment step of introducing into the gas treatment apparatus for treatment. In the method for regenerating methyl (meth)acrylate according to claim 16 ,
The regeneration system is connected to the first capture tank, and the residue comprising undegraded components captured in the first capture tank, the residue being discharged from the first capture tank. further comprising a residue storage device including a storage tank for storing said residue containing ingredients;
The regeneration method further comprising a storage step of introducing and storing the residue containing the undecomposed components removed in the removal step from the first capture tank into the residue storage device. A method for regenerating methyl (meth)acrylate using the regeneration system according to claim 6 ,
a pyrolysis step of pyrolyzing the scrap by the pyrolyzer to generate a gas containing methyl (meth)acrylate;
The gas containing methyl (meth)acrylate is introduced into a first capture tank through a first connecting pipe to capture the residue containing undecomposed components contained in the gas containing methyl (meth)acrylate. and a removing step of removing as the residue containing undecomposed components;
said gas containing methyl (meth)acrylate treated by said first capture tank is led out of said first capture tank through a second connecting pipe, and is selected from the group consisting of a purifier and a cooler; a treatment step of introducing into the gas treatment apparatus and treating;
Opening the second residue on-off valve with the third residue on-off valve closed, and opening the second inert gas on-off valve with the first inert gas supply valve closed. the residue containing the undecomposed components from the first capture tank is led out to the second capture tank through the second residue lead-out connection pipe, and the residue containing the undecomposed components is transported to the second capture tank. A temporary storage step of storing,
By opening the first inert gas on-off valve and the second inert gas on-off valve with the second residue on-off valve and the third residue on-off valve closed, the first The inert gas supplied from the inert gas supply unit is circulated from the second trapping tank to the first trapping tank to replace the combustible gas filling the second trapping tank with the inert gas, a storage preparation step for making preparations for detoxifying and storing the inside of the capture tank of 2;
With the second residue on-off valve and the second inert gas on-off valve closed, the third residue on-off valve is opened, and the first inert gas on-off valve is opened to remove undecomposed components. a storage step of discharging and introducing the liquid residue containing the residue from the second capture tank into the residue storage device through a third residue lead-out connection pipe having a third residue on-off valve.

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