KR102021118B1 - Polysthylene extraction method for recycling of fire resilient styroform - Google Patents

Abstract

The present invention relates to a polysthylene extraction method for recycling of incombustible styrofoam, which extracts polysthylene of high purity by isolating and extracting an incombustible material and polysthylene from incombustible styrofoam, and thus contributes to recycling of the incombustible styrofoam, thereby preventing the environmental pollution and promoting an increased income in the recycling market. The polysthylene extraction method comprises: an agitation step for agitating a raw material produced from shredding volume-reduced incombustible styrofoam and a solvent for dissolving the raw material in a predetermined mixing ratio, thereby producing a dissolved solution; a filtering step for extracting, from the dissolved solution, a filtering solution containing the solvent and polysthylene contained in the raw material; a filtering solution storage step for storing the filtering solution; and a filtering solution separation step for separating the filtering solution into the solvent and the polysthylene.

Description

POLYSTHYLENE EXTRACTION METHOD FOR RECYCLING OF FIRE RESILIENT STYROFORM}

The present invention relates to a polystyrene extraction method for the recycling of flame retardant styrofoam, and more specifically, to separate the flame retardant and polystyrene from the flame retardant styrofoam to extract high-purity polystyrene, to help recycle the flame retardant styrofoam to prevent and recycle the environmental pollution The present invention relates to a method for extracting polystyrene for the recycling of flame retardant styrofoam, which enables the market to generate new profits.

In general, expanded polystyrene (expanded polystyrene), better known under the trade name Styrofoam, is widely used as a packaging container, a heat insulating material, a buoyancy sphere, etc. because of its light weight and excellent shock absorption and thermal insulation. Since these styrofoam products are relatively durable and inexpensive, most of them are discarded after being used once, resulting in huge amounts of waste styrofoam every day throughout the country.

Waste styrofoam does not rot well in its natural state and is mainly incinerated. In this process, harmful gases such as dioxins, known as carcinogens, are generated. Thus, efforts to increase the recycling rate of waste styrofoam have been attempted in many ways, but waste styrofoam has a very large volume, which is difficult to collect and transport. In accordance with such social demands, volume reduction techniques have been developed to reduce the volume of waste styrofoam and improve recycling efficiency.

More than 95% of the white styrofoam in Korea is collected and recycled, and the collector collects it and classifies it into A, B, and C grades and sells it to the pellet processing company. Since it is distributed in a manner, recycling equipment such as a reducer, an extruder, an injection machine, etc. has also grown together, and the technology is progressing considerably.

However, in the case of sandwich panels used in buildings under the revised building law since 1995, flame retardant styrofoam must be used. When producing flame retardant styrofoam, flame retardant and expanded graphite are added to the polystyrene beads. When these flame retardants are injected into the mold, the flame retardant styrofoam has been left in the recycling market for over 20 years.

However, in recent years, the demand for flame retardant styrofoam is increasing nationwide due to the process of reconstruction and the expansion of new industrial complexes due to the endurance of buildings, but the disposal cost is high, and it is difficult to recycle the flame retardant styrofoam in the recycling market. Therefore, it has become a major culprit of neglect and environmental pollution nationwide.

Korean Unexamined Patent Publication No. 2017-0035203 (Invention name: Reclaimed resin production apparatus and method for producing recycled resin, published on March 30, 2017)

An object of the present invention is to solve the conventional problems, it is possible to extract a high-purity polystyrene by separating and extracting the flame retardant and polystyrene from the flame retardant styrofoam, to help the recycling of the flame retardant styrofoam to prevent environmental pollution and create a new profit in the recycling market The present invention provides a method for extracting polystyrene for recycling a flame retardant styrofoam which can be planned.

According to a preferred embodiment for achieving the above object of the present invention, the polystyrene extraction method according to the present invention by stirring the raw material produced by the grinding of the flame retardant styrofoam and the solvent for dissolution of the raw material in a predetermined mixing ratio A stirring step of producing a solution; A filtering step of extracting a filtering solution in which the solvent and the polystyrene contained in the raw material are mixed from the dissolving solution; A filtering liquid storage step in which the filtering liquid is stored; And a filtering liquid separation step of separating the filtering liquid into the solvent and the polystyrene. The filtering liquid separation step includes a deceleration transport step of rotating and moving the filtering liquid supplied in the filtering liquid storage step through a screw unit. ; And a barrel heating step of heating at least one of the screw unit and the filtering liquid rotated and moved in the screw unit to maintain the predetermined temperature range while the deceleration conveying step is performed.

Polystyrene extraction method according to the present invention comprises a stirring step of producing a dissolved solution by stirring the raw material produced by the grinding of the flame retardant styrofoam and the solvent for dissolution of the raw material in a predetermined mixing ratio; A filtering step of extracting a filtering solution in which the solvent and the polystyrene contained in the raw material are mixed from the dissolving solution; A filtering liquid storage step in which the filtering liquid is stored; And a filtering liquid separation step of separating the filtering liquid into the solvent and the polystyrene. The filtering liquid separation step includes a deceleration transport step of rotating and moving the filtering liquid supplied in the filtering liquid storage step through a screw unit. ; And a hot water mixing step of maintaining the screw unit immersed in hot water so that the hot water having a predetermined temperature range and the filtering liquid directly or indirectly contact each other.

Polystyrene extraction method according to the present invention comprises a stirring step of producing a dissolved solution by stirring the raw material produced by the grinding of the flame retardant styrofoam and the solvent for dissolution of the raw material in a predetermined mixing ratio; A filtering step of extracting a filtering solution in which the solvent and the polystyrene contained in the raw material are mixed from the dissolving solution; A filtering liquid storage step in which the filtering liquid is stored; And a filtering liquid separation step of separating the filtering liquid into the solvent and the polystyrene. The filtering liquid separation step includes: a liquid spraying a filtering liquid delivered through the filtering liquid storage step into a hot air reaction tank. Spraying step; Hot air spraying step of injecting hot air having a predetermined temperature range to the filtering liquid injected into the hot air reaction tank or the inside of the hot air reaction tank while the liquid spraying step; And a blower step of discharging the polystyrene generated in the hot air reaction tank according to the evaporation of the filtering liquid by the hot air.

Here, the filtering liquid separation step, the cyclone step of extracting a gaseous solvent by applying a centrifugal force to the polystyrene delivered through the blower step; And an extract reduction step of reducing the polystyrene transferred through the blower step. At least any one of the more.

Polystyrene extraction method according to the present invention comprises a stirring step of producing a dissolved solution by stirring the raw material produced by the grinding of the flame retardant styrofoam and the solvent for dissolution of the raw material in a predetermined mixing ratio; A filtering step of extracting a filtering solution in which the solvent and the polystyrene contained in the raw material are mixed from the dissolving solution; A filtering liquid storage step in which the filtering liquid is stored; And a filtering liquid separation step of separating the filtering liquid into the solvent and the polystyrene, wherein the filtering liquid separation step comprises mixing an antisolvent mixture by mixing the filtering liquid and an antisolvent delivered through the filtering liquid storage step. Generating an antisolvent mixture step of extracting the polystyrene from the antisolvent mixture; And a fractional distillation step of fractionally distilling the antisolvent mixture remaining after the polystyrene is extracted into the antisolvent and the solvent by a difference in boiling point.

The filtering liquid separation step may further include a heat exchange step for liquefying the solvent in a gaseous state.

Here, prior to the stirring step, the raw material storage step of storing the raw material; A solvent storage step in which the solvent is stored; And a metering step of supplying the raw material and the solvent at a predetermined mixing ratio; At least any one of the more.

The filtering step may include extracting the lysate by passing the lysate through a multi-stage filtering means to which any one of a bag filter method, a shaking method, and a centrifugation method is applied; And a filtration step of filtering the filtering liquid after a predetermined filtration purity after the extraction step.

Here, the filtering step, the flotation separation step of extracting the fine sludge from the filtering liquid by injecting the microbubble to the filtering liquid or the filtering liquid discharged from the filtration step to the filtration step; do.

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According to the polystyrene extraction method for recycling the flame retardant styrofoam according to the present invention, it is possible to extract the high-purity polystyrene by separating and extracting the flame retardant and polystyrene from the flame retardant styrofoam, to help the recycling of the flame retardant styrofoam and to prevent environmental pollution and new profit in the recycling market We can promote creation.

In addition, the present invention can be stably materialized flame retardant styrofoam through ingot through the reduction of the flame retardant styro product.

In addition, the present invention can stabilize the stirring of the raw material and the solvent in the dissolution tank through the dissolution stirring.

In addition, the present invention can precisely mix the raw material and the solvent and limit the combination of the solvent and the polystyrene through the limitation of the metering unit and the predetermined mixing ratio.

In addition, the present invention can stably extract the filtering liquid from the solution through the filtering unit, it is possible to improve the purity of the filtering liquid to 95% or more.

In addition, the present invention can stabilize the extraction and discharge of the sludge from the solution through the filtering unit.

In addition, the present invention can stabilize the separation of the filtering liquid and sludge in the solution through centrifugation of the solution.

In addition, the present invention can stably float the fine sludge in the filtering liquid through the flotation separation tank to further improve the purity of the filtering liquid, and the production of microbubbles in the filtering liquid which is an organic solvent through the radical portion (not shown) Can be promoted.

In addition, the present invention can extract the polystyrene in the solid state from the filtering liquid with a high purity through the filtering liquid separation unit, it is possible to separate and extract the gaseous solvent from the filtering liquid.

In addition, the present invention can facilitate the vaporization of the solvent in the filtering liquid using direct or indirect heating of the filtering liquid in the filtering liquid separation unit.

In addition, the present invention can separate the hot water mixed for heating the filtering liquid in the filtering liquid separation unit, it is possible to stably extract the polystyrene mixed in the hot water.

In addition, the present invention can simplify the extraction of polystyrene from the filtering solution through the mixing of the filtering solution and the antisolvent in the filtering solution separation unit.

In addition, the present invention can be separated and extracted with the anti-solvent and the solvent using the difference in boiling point according to the fractional distillation of the anti-solvent mixture from which the polystyrene is removed.

In addition, the present invention can be stably liquefied by storing the vaporized anti-solvent and the vaporized solvent separately, it is possible to recycle the liquefied anti-solvent and liquefied solvent.

In addition, the present invention can prevent the mixing of the polystyrene and water extracted from the filtering liquid in accordance with the heating of the filtering liquid by hot air in the filtering liquid separation unit, it is possible to obtain a stable polystyrene by increasing the purity of the extracted polystyrene.

1 is a flowchart illustrating a polystyrene extraction method according to an embodiment of the present invention.
2 is a flow chart showing a first example of the filtering step in the polystyrene extraction method according to an embodiment of the present invention.
3 is a flow chart showing a second example of the filtering step in the polystyrene extraction method according to an embodiment of the present invention.
Figure 4 is a flow chart showing a third example of the filtering step in the polystyrene extraction method according to an embodiment of the present invention.
5 is a flowchart illustrating a first example of the filtering liquid separation step in the polystyrene extraction method according to an embodiment of the present invention.
6 is a flow chart showing a second example of the filtering liquid separation step in the polystyrene extraction method according to an embodiment of the present invention.
7 is a flowchart illustrating a third example of the filtering liquid separation step in the polystyrene extraction method according to an embodiment of the present invention.
8 is a flowchart showing a fourth example of the filtering liquid separation step in the polystyrene extraction method according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a polystyrene extraction method for recycling the flame retardant styrofoam according to the present invention. At this time, the present invention is not limited or limited by the embodiment. In addition, in describing the present invention, a detailed description of known functions or configurations may be omitted to clarify the gist of the present invention.

1 to 8, the polystyrene extraction method according to an embodiment of the present invention may extract and recycle polystyrene (PS) from flame retardant styrofoam.

Here, the flame retardant styrofoam represents a state in which a flame retardant (expanded graphite + flame retardant) and polystyrene (PS) are bound.

In addition, the raw material is produced in the form of a powder upon grinding of the reduced flame retardant styrofoam.

In addition, the solvent does not ignite with the catalyst stock solution for dissolving the flame-retardant styrofoam, has a low vaporization point, is not fatal to the human body, and has a very small reaction force with synthetic resins other than polystyrene (PS). The solvent (MC) may be formed of any one of benzene, thinner, gasoline, acetone, and methylene chloride. In particular, the solvent (MC) may be made of methylene chloride. Methylene chloride, a solvent (MC), does not ignite, has a vaporization point of between 35 degrees Celsius and 45 degrees Celsius, and is not lethal to the human body unless directly inhaled, which is relatively active in semiconductor manufacturing and washing. In addition, methylene chloride, a solvent (MC), is excellent for dissolving polystyrene, but does not react with polypropylene (PP, Polypropylene), polyethylene (PE, Polyethylene) and the like.

In addition, the dissolution liquid is a mixed liquid in which a solvent (MC) is mixed with a powdery raw material.

In addition, the filtering liquid is a liquid in which polystyrene (PS) is dissolved in methylene chloride, which is a solvent (MC), and is extracted through a filtering step (S3).

In addition, the antisolvent (G) is a liquid which extracts polystyrene (PS) from the filtering liquid, and may react with methylene chloride, which is the solvent (MC) of the filtering liquid, to separate the polystyrene (PS) from the methylene chloride. The antisolvent (G) includes alcohols. In particular, the antisolvent (G) may consist of methanol. Methanol, an antisolvent (G), showed the most excellent results compared to other alcohols of the same amount in the shape experiments in which polystyrene (PS) was separated from the filtering liquid and the saturation with the filtering liquid.

The reservoirs, tanks, and barrels described below may be kept closed to prevent the diffusion of the solvent MC into the atmosphere, thereby preventing a safety accident.

Polystyrene extraction method according to an embodiment of the present invention allows to extract and recycle the polystyrene (PS) from the flame retardant styrofoam.

In the polystyrene extraction method according to an embodiment of the present invention, the stirring step (S2) of generating a dissolved solution by stirring a raw material and a solvent (MC) for dissolution of the raw material produced by crushing the flame retardant styrofoam in a predetermined mixing ratio And a filtering step (S3) of extracting a filtering solution in which the solvent (MC) and the polystyrene (PS) contained in the raw material are mixed from the dissolved solution, a filtering solution storage step (S4) in which the filtering solution is stored, and a filtering solution. It may include a filtering liquid separation step (S5) for separating into a solvent (MC) and polystyrene (PS).

Polystyrene extraction method according to an embodiment of the present invention is to be carried out before the stirring step, the raw material storage step (S12) and the solvent storage step (S11) to store the solvent (MC), the raw material and the solvent is stored It may further include at least one of the metering step (S1) for supplying (MC) at a predetermined mixing ratio.

Raw material storage step (S12) comprises a hopper storage step (S15) for storing the raw material in the form of powder, and further comprises an incoat grinding step (S14) for grinding the ingot produced according to the reduction of the flame retardant styrofoam, flame retardant It may further comprise an ingot manufacturing step (S13) for producing an ingot by reducing the styrofoam.

The metering step (S1) is a first weighing step of supplying the raw material to the dissolution tank in the first input amount corresponding to the preset mixing ratio, and a second weighing supply of the solvent (MC) to the dissolution tank in the second input amount in response to the preset mixing ratio. And a weighing control step of controlling the first dose and the second dose at a preset mixing ratio.

In the weighing step (S1), in the weighing control step, the second dose of the solvent (MC) is 390 parts by weight to 410 parts by weight based on 100 parts by weight of the first dose of the raw material so that the preset mixing ratio is set to 1.0: 3.9 to 1.0: 4.1. Can be set. In the metering step S1 of the embodiment of the present invention, the metering control step may be set to 400 parts by weight of the second input amount of the solvent MC with respect to 100 parts by weight of the first input amount of the raw material so that the preset mixing ratio is set to 1.0: 4.0. .

In the filtering step (S3), the filtering liquid is extracted as the dissolved liquid is filtered through a multi-stage filtering means, and then filtered over a predetermined filtration purity. In other words, in the filtering step (S3), as the lysate passes through the multi-stage filtering means, the sludge containing the flame retardant is separated from the lysate, and the filtering solution is first extracted, and the first extracted filtering solution is used to filter the filtration unit. Filter through a predetermined filtration purity through. At this time, the filtering step (S3) may be provided with a floating separation step (S37) for extracting the fine sludge contained in the filtering liquid or the filtering liquid to pass through the primary extraction unit. Flotation separation step (S37) by using a microbubble to extract the fine sludge from the filtering liquid, it is possible to obtain a high-purity filtering liquid.

Filtering step (S3) is the extraction step of extracting the filtering liquid by passing the solution through a multi-stage filtering means to which any one of the bag filter method, the shaking method, and the centrifugal separation method is applied, and the extraction step Next, the filtering solution may include a filtration step of filtering a predetermined filtration purity or more.

More specifically, the filtering step S3 may be largely divided into a bag filter method, a shaking method, and a centrifugal separation method according to the operation method of the filtering means.

As shown in FIG. 2, the bag filter method may be a first example of the filtering step S3. Filtering step (S3) according to the first example is a multi-stage bag filter step (S31) for passing the filtering liquid from the solution by the bag filter and the filtering liquid passed through the bag filter step (S31) more than the predetermined filtration purity It may comprise a filtration step of filtering to. Then, the filtering liquid that has passed the filtering step may have a predetermined filtration purity range of 95% or more.

The shaking method may be represented as a second example of the filtering step S3 as shown in FIG. 3. Filtering step (S3) according to the second example is a shaking step (S32) for passing the filtering solution in the solution by shaking shaker stacked in a plurality of stages spaced apart from each other, and the filtering liquid passed through the shaking step (S32) It may include a filtration step of filtering over a predetermined filtration purity. Then, the filtering liquid passing through the filtering step S3 may have a predetermined filtration purity range of 95% or more. Here, the first screen net of 150 mesh, the second screen net of 350 mesh, and the third screen net of 500 mesh may be stacked step by step.

Centrifugal separation may be represented as a third example of the filtering step (S3) as shown in FIG. Filtering step (S3) according to the third example is the first centrifugation step (S34) for extracting the one-dimensional centrifugation solution by centrifuging the solution, and the two-dimensional centrifugation solution by centrifugation The second centrifugal separation step (S35) to extract, the second centrifugal separation step (S36) for extracting the filtering liquid by centrifuging the two-dimensional centrifugation liquid, and the filtering liquid passed through the third centrifugal separation step (S36) It may include a filtration step of filtering over a predetermined filtration purity. Then, the filtering liquid passing through the filtering step S3 may have a predetermined filtration purity range of 95% or more. Here, in the first centrifugal separation step S34, if the decanter type centrifuge is adopted, and in the second centrifugal separation step S35, the disc type centrifuge is employed, in the third centrifugal separation step S36, the tubular is separated. By adopting a centrifugal separator of the type can be maximized the recovery of the sludge in the solution.

In the above-described filtering step S3, the filtration step may include at least one of a filter press step S33 and a microfilter step S38. The filter press step S33 may facilitate extraction of the filtering liquid from the dissolving liquid even if the concentration of the dissolving liquid is high. In the micro filter step S38, a 0.45 micron filter, a carbon filter, and a 0.2 micron filter may be sequentially disposed in steps.

At this time, the expanded graphite contained in the sludge may be broken while passing through the filtering step (S3). As a result, the particles of the sludge become finely small, and further separation of the fine sludge may be necessary. In particular, the sludge is lighter than the dissolving solution, so it may remain on top of the dissolving solution during centrifugation.

Accordingly, in the exemplary embodiment of the present invention, the filtering step S3 may include fine sludge from the filtering liquid by injecting microbubbles into the filtering liquid or the filtering liquid discharged from the filtering step so that the sludge is floated from the filtering liquid. It may further include a flotation separation step (S37) to float. The filtering step S3 may further include a radical step (not shown) for changing physical properties of the filtering liquid introduced into the flotation separation step S37. The radical step (not shown) may facilitate the generation of the microbubbles in the flotation separation step (S37) by supplying the radical water to the filtering liquid introduced into the flotation separation step (S37). Then, the filtering liquid filtered by the flotation separation step may have a predetermined filtration purity range of 98% to 99% or more.

In the filtering liquid separation step (S5), the polystyrene (PS) is extracted in a solid state by directly or indirectly heating the filtering liquid supplied through the filtering liquid storage step (S4) in a predetermined temperature range, and filtering liquid separation step ( In S5) the solvent (MC) is to be extracted in a gaseous state according to the vaporization of the filtering liquid by heating.

The preset temperature range may be set to 60 degrees Celsius to 80 degrees Celsius. Within the preset temperature range, the vaporization point of the solvent MC may be greater than that of the solvent MC to promote vaporization of the solvent MC, and the combustion of the polystyrene PS may be prevented. The preset temperature range may be variously adjusted in units of 1 degree between 60 degrees Celsius and 80 degrees Celsius.

However, when the heating unit or the hot air is used in the predetermined temperature range, if it is out of the predetermined temperature range, the vaporization of the solvent MC is slowed down, or the combustion reaction of the polystyrene PS occurs with the vaporization of the solvent MC. There is a problem. In addition, when the hot water is used in the predetermined temperature range, when out of the predetermined temperature range, the vaporization of the solvent (MC) is slow, or the hot water is also vaporized with the vaporization of the solvent (MC) to lower the purity of the solvent (MC) And the problem of additional separation of water vapor.

And the gaseous solvent is liquefied through the heat exchange step (S84) can be recycled.

Filtering liquid separation step (S5) can be divided into four types according to the heating method of the filtering liquid.

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The filtering liquid separation step S5 according to the first example allows the filtering liquid to pass through the screw unit through the deceleration conveying step S54 as shown in FIG. 5, and directly heats the screw unit through the barrel heating step S55. Polystyrene (PS) can be extracted.

The filtering liquid separation step (S5) according to the first example is a screw while passing through the deceleration transport step (S54) and the deceleration transport step (S54) to rotate the filtering liquid supplied in the filtering liquid storage step (S4) through the screw unit The inside of the unit may include a barrel heating step (S55) for heating at least one of the screw unit and the filtering liquid rotated in the screw unit to maintain a predetermined temperature range.

At this time, the screw unit may rotate the filtering liquid at a predetermined reduction ratio. In addition, the screw unit is inclined upward from the input side of the filtering liquid toward the discharge side so that the filtering liquid contained in the inside of the screw unit is sufficiently heated, and the gaseous solvent is stably discharged.

The screw unit includes a screw barrel through which the filtering liquid supplied from the filtering liquid reservoir passes, a barrel screw rotatably coupled to the screw barrel, a barrel reducer for rotating the barrel screw at a predetermined reduction ratio, and a screw. The inside of the barrel may include a barrel heater provided on the outer circumferential surface of the screw barrel to dissipate heat so as to maintain a predetermined temperature range. The screw unit further includes a barrel hot air fan for supplying hot air to the inside of the screw barrel, thereby facilitating extraction of polystyrene (PS) from the filtering liquid, and preventing the polystyrene (PS) extracted from the inner wall of the screw barrel from sticking to the screw barrel. To ensure stable release of polystyrene (PS).

Then, the polystyrene (PS) in the solid state is extracted from the filtering liquid as the filtering liquid is directly or indirectly heated by the barrel heating step (S55), and the gaseous solvent (MC) is removed from the filtering liquid according to the vaporization by heating. Extracted.

In the filtering liquid separation step (S5) according to the first example, the screw unit may be divided into an input screw unit and an discharge screw unit.

The input screw unit may include a first barrel through which the filtering liquid supplied from the filtering liquid reservoir passes, a first screw rotatably coupled to the first barrel, and rotating the first filtering liquid at a predetermined reduction ratio. It may include a first reducer and a first heater provided on the outer circumferential surface of the first barrel so as to maintain a predetermined temperature range inside the first barrel. The feeding screw unit may further include a first hot air fan for supplying hot air to the inside of the first barrel.

In addition, the discharge screw unit is a second barrel through which the filtering liquid and the polystyrene (PS) passing from the input screw unit, and the second liquid is rotatably coupled to the second barrel for the rotation and discharge of the filtering liquid and polystyrene (PS) It may include a second screw, a second reducer for rotating the second screw at a predetermined reduction ratio, and a second heater provided on the outer circumferential surface of the second barrel. The discharge screw unit may further include a second hot air fan for supplying hot air to the inside of the second barrel.

Filtering liquid separation step (S5) according to the first example may further include a transfer step (S53) for transferring the polystyrene (PS) extracted through the barrel heating step (S55) to the drying step (S82). Transfer step (S53) may be carried out by the operation of the discharge screw unit.

Filtering liquid separation step (S5) according to the first example may further include a drying step (S82) for drying the polystyrene (PS) discharged from the screw unit. By going through the drying step (S82) it is possible to obtain a polystyrene (PS) in the powder state or in the coat state. Drying step (S82) to extract the solvent (MC) remaining in the polystyrene (PS), and the extracted solvent (MC) is to be transferred to the heat exchange step (S84).

The filtering liquid separation step (S5) according to the first example is a gas state generated in the deceleration transport step (S54), barrel heating step (S55) and drying step (S82) according to the vaporization of the filtering liquid by the barrel heating step (S55) It may further comprise a heat exchange step (S84) for liquefying the solvent (MC). The solvent liquefied by the heat exchange step (S84) can be recovered and recycled to the solvent storage step (S11).

The filtering liquid separation step S5 according to the second example allows the filtering liquid to pass through the screw unit through the deceleration conveying step S54 as shown in FIG. 6, and the screw unit or the filtering liquid through the hot water mixing step S70. The polystyrene (PS) can be extracted by direct heating.

Filtering liquid separation step (S5) according to the second example is a deceleration transport step (S54) for rotating the filtering liquid supplied in the filtering liquid storage step (S4) through a screw unit, hot water and a filtering liquid having a predetermined temperature range It may include a hot water mixing step (S70) for maintaining a state in which the screw unit is immersed in hot water so that the direct or indirect contact.

Then, the polystyrene (PS) in the solid state is extracted from the filtering liquid as the filtering liquid is directly or indirectly heated by hot water, and the gaseous solvent (MC) is extracted from the filtering liquid according to the vaporization by heating.

In the filtering liquid separation step (S5) according to the second example, the screw unit may be divided into an input screw unit forming a downward slope and a discharge screw unit forming an upward slope.

The input screw unit may include a first barrel through which the filtering liquid supplied from the filtering liquid reservoir passes, a first screw rotatably coupled to the first barrel, and rotating the first filtering liquid at a predetermined reduction ratio. It may include a first reducer and a first heater provided on the outer circumferential surface of the first barrel so as to maintain a predetermined temperature range inside the first barrel. The feeding screw unit may further include a first hot air fan for supplying hot air to the inside of the first barrel.

In addition, the discharge screw unit is a second barrel through which the filtering liquid and the polystyrene (PS) passing from the input screw unit, and the second liquid is rotatably coupled to the second barrel for the rotation and discharge of the filtering liquid and polystyrene (PS) It may include a second screw, a second reducer for rotating the second screw at a predetermined reduction ratio, and a second heater provided on the outer circumferential surface of the second barrel. The discharge screw unit may further include a second hot air fan for supplying hot air to the inside of the second barrel.

Filtering liquid separation step (S5) according to the second example may further include a hot water generation step (S56) for maintaining the hot water immersed in the screw unit in a predetermined temperature range.

In the hot water generating step (S56) or hot water mixing step (S70) is a hot water storage tank is made of a sealed container, the heating unit provided in the hot water storage tank can be heated to produce hot water (S56).

In the hot water mixing step (S70), the filtering network and the hot water are in contact with each other so that the filtering liquid is stably separated into polystyrene (PS) and a solvent (MC).

Filtering liquid separation step (S5) according to the second example may further include a transfer step (S53) for transferring the polystyrene (PS) extracted through the hot water mixing step to the dehydration step (S81) or drying step (S82). Transfer step (S53) may be carried out by the operation of the screw unit.

The filtering liquid separation step S5 according to the second example may further include a dehydration step S81 for removing water from the polystyrene PS discharged from the screw unit. Moisture discharged from the dehydration step (S81) is delivered to the hot water mixing step (S70) can be recycled. By passing through the dehydration step (S81) it is possible to prevent the generation of water vapor in the drying step (S82). Dehydration step (S81) to extract the solvent (MC) remaining in the polystyrene (PS), the extracted solvent (MC) is to be transferred to the heat exchange step (S84).

Filtering liquid separation step (S5) according to the second example may further include a drying step (S82) for drying the polystyrene (PS) that is passed through the transfer step (S53) or dehydration step (S81). By going through the drying step (S82) it is possible to obtain a polystyrene (PS) in the powder state or in the coat state. Drying step (S82) to extract the solvent (MC) remaining in the polystyrene (PS), and the extracted solvent (MC) is to be transferred to the heat exchange step (S84).

Filtering liquid separation step (S5) according to the second example is a gas state generated in the deceleration transport step (S54), hot water mixing step (S70) and drying step (S82) according to the vaporization of the filtering liquid by the hot water mixing step (S70) It may further comprise a heat exchange step (S84) for liquefying the solvent (MC). Solvent (MC) liquefied by the heat exchange step (S84) can be recycled to the solvent storage step (S11).

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In the filtering liquid separation step (S5) according to the third example, as shown in FIG. 7, hot air may be sprayed on the filtering liquid to be injected to heat the filtering liquid to extract polystyrene (PS).

Filtering liquid separation step (S5) according to the third example is the liquid spray step (S59) and the liquid spray step (S59) to inject the filtering liquid into the hot air reaction tank inside the hot air reaction tank or the hot air reaction tank Hot air spraying step (S71) for injecting hot air having a predetermined temperature range to the injected filtering liquid, and a blower step for discharging the polystyrene generated in the hot air reaction tank according to the vaporization of the filtering liquid by the hot air.

Then, the polystyrene (PS) in the solid state is extracted from the filtering liquid as the filtering liquid is directly or indirectly heated by the hot air, and the gaseous solvent (MC) is extracted from the filtering liquid according to the vaporization by the hot air.

Hot air reaction tank may be made of a sealed container. Although not shown, the hot air reaction tank may be provided with a heating unit for heating the inside.

The liquid injection step S59 may spray the filtering liquid in the form of a mist.

Blower step (S73) may carry the polystyrene (PS) generated in the hot air reaction tank through a powder blower to a cyclone or a delivery storage tank. Blower step (S73) may discharge the polystyrene (PS) generated in the cyclone. Blower step (S73) may carry the polystyrene (PS) generated through the cyclone step (S74) through the delivery blower to the delivery storage tank.

The filtering liquid separation step (S5) according to the third example may further include a hot air generation step (S72) of generating hot air having a predetermined temperature range and transferring it to the hot air injection step (S71).

Filtering solution separation step (S5) according to the third example is a cyclone step (S74) for extracting the gaseous solvent (MC) through a cyclone by applying a centrifugal force to the polystyrene (PS) delivered through the blower step (S73). It may include. The solvent MC extracted in the cyclone step S74 is transferred to the heat exchange step S84.

In the filtering liquid separation step S5 according to the third example, the delivery storage tank may store the polystyrene (PS) delivered from the powder blower or the delivery blower.

Filtering solution separation step (S5) according to the third example is the extraction and reduction step for reducing the polystyrene (PS) delivered through the powder blower, the cyclone, the delivery blower, the transfer storage tank and the blower step (S73) It may further include (S75).

In the filtering liquid separation step (S5) according to the third example, the extrudate (PSC) may be obtained by extruding the reduced polystyrene (PS) through the extruder through the extraction reduction step (S75).

Filtering liquid separation step (S5) according to the third example further includes a heat exchange step (S84) for liquefying the gaseous solvent (MC) generated in the hot air reaction tank, cyclone, delivery storage tank according to the vaporization of the filtering liquid by hot air can do. Solvent (MC) liquefied by the heat exchange step (S84) can be recycled to the solvent storage step (S11).

In the filtering liquid separation step (S5) according to the fourth example, as shown in FIG. 8, the anti-solvent (G) may be mixed with the filtering liquid to extract polystyrene (PS).

In the filtering liquid separation step (S5) according to the fourth example, the polystyrene (PS) is extracted in a solid state according to the mixing of the filtering liquid and the antisolvent (G), and the solvent (MC) in the filtering liquid separation step (S5) According to the mixing of the anti-solvent (G) and the anti-solvent (G) may be extracted in a mixed liquid state.

The solvent (MC) of the liquid ecology mixed with the antisolvent (G) is fractionally distilled into the gaseous antisolvent (G) and the gaseous solvent (MC) by the difference in boiling point during the fractional distillation step (S63). Can be. In addition, the gaseous antisolvent G may be liquefied and recycled through the liquefaction step S83, and the gaseous solvent MC may be liquefied and recycled through the heat exchange step S84.

The filtering liquid separation step S5 according to the fourth example generates an antisolvent mixture by mixing the filtering liquid delivered through the filtering liquid storage step S4 and the antisolvent G delivered through the antisolvent storage step S60. The antisolvent mixture step (S61) of extracting polystyrene (PS) from the antisolvent mixture and the antisolvent mixture from which the polystyrene (PS) is extracted are separated into antisolvent (G) and a solvent (MC) by the difference in boiling point. A distillation fractionation step (S63) may be included.

Then, the polystyrene (PS) in the solid state is extracted from the filtering liquid according to the mixing of the antisolvent (G) and the filtering liquid, and the gaseous solvent (MC) and the gaseous antisolvent ( G) is extracted respectively.

The filtering liquid separation step S5 according to the fourth example may further include an antisolvent storage step S60 in which the antisolvent G is stored. Anti-solvent storage step (S60) may be supplied to the anti-solvent mixing step (S61) the anti-solvent (G) at a predetermined blending ratio. The filtering liquid storage step S4 may also supply the filtering liquid to the antisolvent mixing step S61 at a predetermined blending ratio.

The filtering liquid separation step S5 according to the fourth example may further include a compression step S62 for compressing the polystyrene PS extracted in the antisolvent mixing step S61. The antisolvent mixture discharged from the compression step S62 may be transferred to the fractionation distillation step S63 or the antisolvent mixing step S61.

The filtering liquid separation step S5 according to the fourth example may further include a drying step S82 for drying the polystyrene PS discharged from the compression step S62 or the antisolvent mixing step S61. By going through the drying step (S82) it is possible to obtain a polystyrene (PS) in the powder state or in the coat state. Drying step (S82) to extract the solvent (MC) remaining in the polystyrene (PS), and the extracted solvent (MC) is to be transferred to the heat exchange step (S84).

The filtering liquid separation step S5 according to the fourth example may further include a liquefaction step S83 for liquefying the gaseous antisolvent G generated in the fractionation distillation step S63. The antisolvent G liquefied by the liquefaction step S83 may be recovered and recycled to the antisolvent storage step S60.

Filtering liquid separation step (S5) according to the fourth example is a heat exchange step for liquefying the gaseous solvent (MC) generated in the fractional distillation step (S63), the gaseous solvent (MC) generated in the drying step (S82) ( S84) may be further included. Solvent (MC) liquefied by the heat exchange step (S84) can be recycled to the solvent storage step (S11).

According to the polystyrene extraction method for recycling the flame retardant styrofoam, it is possible to extract the high-purity polystyrene (PS) by separating and extracting the flame retardant and polystyrene (PS) from the flame retardant styrofoam, to help recycle the flame retardant styrofoam to prevent and recycle the environmental pollution Can generate new revenue in the market.

In addition, the flame retardant styrofoam can be stably materialized through incoat through reduction of the flame retardant styro product.

In addition, it is possible to stabilize the stirring of the raw material and the solvent (MC) in the dissolution tank through the stirring step (S2).

In addition, it is possible to precisely mix the raw material and the solvent (MC) through the measurement step (S1) and the limitation of the preset mixing ratio, and to clarify the combination of the solvent (MC) and the polystyrene (PS).

In addition, through the filtering step (S3) it is possible to stably extract the filtering liquid from the dissolved liquid, it is possible to improve the purity of the filtering liquid to 95% or more.

In addition, through the filtering step (S3) it is possible to stabilize the extraction and discharge of the sludge from the solution.

In addition, it is possible to stabilize the separation of the filtering liquid and the sludge from the solution by centrifugation of the solution.

In addition, through the flotation separation step (S37) it is possible to stably float the fine sludge in the filtering liquid to further improve the purity of the filtering liquid, and to generate the microbubbles in the filtering liquid which is an organic solvent through the radical portion (not shown) Can be promoted.

In addition, through the filtering liquid separation step (S5) it is possible to extract the polystyrene (PS) in the solid state from the filtering liquid with high purity, and to separate and extract the gaseous solvent (MC) from the filtering liquid.

In addition, the vaporization of the solvent (MC) in the filtering liquid by using the direct or indirect heating of the filtering liquid in the filtering liquid separation step (S5).

In addition, in the filtering liquid separation step (S5) it is possible to separate the hot water mixed for heating the filtering liquid, it is possible to stably extract the polystyrene (PS) mixed in the hot water.

In addition, it is possible to simplify the extraction of polystyrene (PS) from the filtering solution through the mixing of the filtering solution and the antisolvent (G) in the filtering solution separation step (S5).

In addition, according to the fractional distillation of the anti-solvent mixture from which the polystyrene (PS) has been removed, the solvent may be separated and extracted into the anti-solvent (G) and the solvent (MC).

In addition, the vaporized antisolvent (G) and the vaporized solvent (MC) can be stored separately to liquefy reliably, and the liquefied antisolvent (G) and the liquefied solvent (MC) can be recycled.

In addition, the filtering liquid separation step (S5) in accordance with the heating of the filtering liquid by hot air to prevent mixing of the polystyrene (PS) and water extracted from the filtering liquid, and to increase the purity of the extracted polystyrene (PS) to stably increase the polystyrene ( PS) can be obtained.

Although the preferred embodiments of the present invention have been described with reference to the drawings as described above, those skilled in the art will appreciate that various modifications of the present invention can be made without departing from the spirit and scope of the invention as set forth in the claims below. Can be modified or changed.

S11: solvent storage step S12: raw material storage step S13: ingot manufacturing step
S14: Ingot grinding step S15: Hopper storage step S1: Weighing step
S2: stirring step S3: filtering step S31: bag filter step
S32: shaking step S33: filter press step S34: first centrifugal step
S35: second centrifugal separation step S36: third centrifugal separation step S37: floating separation step
S38: micro filter step S4: filtering liquid storage step S5: filtering liquid separation step
S53: transfer step S54: deceleration transport step S55: barrel heating step
S56: hot water generation step S59: liquid spray step S60: antisolvent storage step
S61: antisolvent mixing step S62: compression step S63: fractional distillation step
S70: hot water mixing step S71: hot air spraying step S72: hot air generating step
S73: blower stage S74: cyclone stage S75: extraction reduction stage
S76: separation step S81: dehydration step S82: drying step
S83: liquefaction stage S6: heat exchange stage PS: polystyrene
MC: Solvent PSC: Extruded G: Antisolvent

Claims (13)

A stirring step of generating a dissolving solution by stirring a raw material produced by grinding of the reduced flame retardant styrofoam and a solvent for dissolving the raw material at a predetermined mixing ratio;
A filtering step of extracting a filtering solution in which the solvent and the polystyrene contained in the raw material are mixed from the dissolving solution;
A filtering liquid storage step in which the filtering liquid is stored; And
And a filtering liquid separation step of separating the filtering liquid into the solvent and the polystyrene.
The filtering liquid separation step,
A deceleration transport step of rotating the filtering liquid supplied in the filtering liquid storage step through a screw unit; And
And a barrel heating step of heating at least one of the screw unit and the filtering liquid rotated and moved in the screw unit to maintain the predetermined temperature range while the deceleration conveying step is performed. Polystyrene extraction method. A stirring step of generating a dissolving solution by stirring a raw material produced by grinding of the reduced flame retardant styrofoam and a solvent for dissolving the raw material at a predetermined mixing ratio;
A filtering step of extracting a filtering solution in which the solvent and the polystyrene contained in the raw material are mixed from the dissolving solution;
A filtering liquid storage step in which the filtering liquid is stored; And
And a filtering liquid separation step of separating the filtering liquid into the solvent and the polystyrene.
The filtering liquid separation step,
A deceleration transport step of rotating the filtering liquid supplied in the filtering liquid storage step through a screw unit; And
And a hot water mixing step of maintaining the screw unit immersed in hot water so that the hot water having a predetermined temperature range and the filtering liquid directly or indirectly contact each other. A stirring step of generating a dissolving solution by stirring a raw material produced by grinding of the reduced flame retardant styrofoam and a solvent for dissolving the raw material at a predetermined mixing ratio;
A filtering step of extracting a filtering solution in which the solvent and the polystyrene contained in the raw material are mixed from the dissolving solution;
A filtering liquid storage step in which the filtering liquid is stored; And
And a filtering liquid separation step of separating the filtering liquid into the solvent and the polystyrene.
The filtering liquid separation step,
A liquid injection step of injecting a filtering liquid delivered through the filtering liquid storage step into a hot air reaction tank;
Hot air spraying step of injecting hot air having a predetermined temperature range to the filtering liquid injected into the hot air reaction tank or the inside of the hot air reaction tank while the liquid spraying step; And
And a blower step of discharging the polystyrene generated in the hot air reaction tank according to vaporization of the filtering liquid by hot air. The method of claim 3,
The filtering liquid separation step,
A cyclone step of extracting a gaseous solvent by applying a centrifugal force to the polystyrene delivered through the blower step; And
Extraction reduction step of reducing the polystyrene delivered through the blower step; Polystyrene extraction method further comprises at least one of. A stirring step of generating a dissolving solution by stirring a raw material produced by grinding of the reduced flame retardant styrofoam and a solvent for dissolving the raw material at a predetermined mixing ratio;
A filtering step of extracting a filtering solution in which the solvent and the polystyrene contained in the raw material are mixed from the dissolving solution;
A filtering liquid storage step in which the filtering liquid is stored; And
And a filtering liquid separation step of separating the filtering liquid into the solvent and the polystyrene.
The filtering liquid separation step,
An antisolvent mixture step of mixing the filtering liquid and the antisolvent delivered through the filtering liquid storage step to generate an antisolvent mixture, and extracting the polystyrene from the antisolvent mixture; And
And a fractional distillation step of fractionally distilling the antisolvent mixture remaining after the polystyrene is extracted into the antisolvent and the solvent by a difference in boiling point. The method according to any one of claims 1 to 5,
The filtering liquid separation step,
And a heat exchange step of liquefying the solvent in a gaseous state. The method according to any one of claims 1 to 5,
Prior to the stirring step,
A raw material storage step in which the raw material is stored;
A solvent storage step in which the solvent is stored; And
A metering step of supplying the raw material and the solvent at a predetermined mixing ratio; Polystyrene extraction method further comprises at least one of. The method according to any one of claims 1 to 5,
The filtering step,
An extraction step of extracting the filtering liquid by passing the solution through a multi-stage filtering means to which one of the bag filter method, the shaking method, and the centrifugation method is applied; And
After the extraction step, the filtration step of filtering the filtering liquid to a predetermined filtration purity or more; polystyrene extraction method comprising a. The method of claim 8,
The filtering step,
Floating separation step of floating by the microbubble to the filtering liquid or the filtering liquid discharged from the filtration step to extract the fine sludge from the filtering liquid to be extracted in the filtration step; Polystyrene extraction further comprising a Way.
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