JP7029723B2 - Waste plastic oiling equipment - Google Patents

Description

The present invention relates to an oil liquefaction device for waste plastic.

In recent years, the treatment of plastic products that are discarded after use and waste plastics that are mainly composed of plastics such as plastic slags produced in the manufacturing process of plastic products has become a universal problem. The main methods for treating waste plastics are incineration, pyrolysis, volume reduction, and disposal. However, from the viewpoint of effective use of resources, waste plastics are thermally decomposed into decomposition gas, and this decomposition gas is cooled. An oil liquefaction device that condenses and oils is attracting attention. Generally, plastics that can be oiled (also referred to as oil-reduced) are thermoplastics such as polystyrene, polypropylene, polycarbonate and polyethylene. However, polyethylene terephthalate (hereinafter sometimes referred to as PET), which is a raw material for PET bottles used in large quantities in the world, contains terephthalic acid as a main component, and terephthalic acid has sublimation properties and is cooled and condensed. There was a problem that the piping and the cooling device were clogged because they crystallized during the process.

Therefore, there is a waste plastic oiling device equipped with a terephthalic acid decomposition device that decomposes terephthalic acid by a catalytic reaction using an acid or a base at a high temperature of a sublimation point (300 ° C.) or higher (see, for example, Patent Document 1). ..

Further, there is a waste plastic oiling device that thermally decomposes waste plastic, injects circulating oil into a decomposition gas containing terephthalic acid to cool it, and crystallizes and discharges terephthalic acid (for example, Patent Document 2). ).

Japanese Patent Application Laid-Open No. 2003-96469 Japanese Unexamined Patent Publication No. 2004-256636

The waste plastic oil liquefier described in Patent Document 1 has a path of directly cooling the decomposition gas obtained by thermally decomposing polystyrene, polypropylene, polyethylene, etc. with a capacitor to liquefy it, and thermally decomposing polyethylene terephthalate. It has two routes: the obtained decomposition gas is decomposed by a terephthalic acid decomposition device, and then condensed by a cooling device to discharge the terephthalic acid decomposition product. That is, there is a problem that polystyrene, polypropylene, polycarbonate, polyethylene and the like and polyethylene terephthalate (PET) must be separated and charged into a pyrolysis tank, and the accounting must be separated by a switching valve.

The waste plastic oiling device described in Patent Document 2 injects circulating oil into a decomposition gas containing terephthalic acid to cool it, crystallize and discharge terephthalic acid, and circulate with solidified terephthalic acid. Since the oil is dispersed, the crystallized terephthalic acid is deposited at the bottoms of the settling tank, the precipitation tank, and the circulating oil tank, which are the routes of the terephthalic acid, so that the circulating oil and the terephthalic acid crystals are separated by centrifugation. There is a problem that it must be separated by machine.

Therefore, the present invention eliminates clogging of pipes due to crystals of terephthalic acid, which is the main component of PET, and efficiently oils the decomposition gas generated by thermal decomposition of waste plastic containing PET, and an oil component having a required composition. It is intended to provide a waste plastic oil liquefaction device capable of obtaining the above.

[1] The waste plastic oil liquefier of the present invention has a thermal decomposition tank that heats and thermally decomposes waste plastic, and a distillation cylinder that heats the decomposition gas generated in the thermal decomposition tank to a level equal to or higher than the sublimation point of terephthalic acid. A terephthalic acid crystallization unit that injects cooling water into the heated decomposition gas to condense it in an oil stock solution and crystallize the terephthalic acid, and the decomposition gas, the terephthalic acid crystals, the cooling water, and the above. A terephthalic acid settling trap that stores the turbid liquid of the oil stock solution and separates the terephthalic acid crystals, the cooling water, and the oil stock solution into layers using the difference in specific gravity, and the terephthalic acid settling trap that is connected to the terephthalic acid settling trap. It is characterized by having an oil storage tank for storing the supernatant of the oil stock solution in a terephthalic acid sedimentation trap.

According to the waste plastic oiling apparatus of the present invention, waste plastic containing PET is thermally decomposed and condensed by injecting cooling water into the decomposed gas produced to generate terephthalic acid crystals and an oil stock solution, and then terephthalic acid. The acid crystals, the cooling water, and the oil stock solution are layer-separated using the difference in specific gravity, and the terephthalic acid crystals are discharged to the outside. By doing so, it is possible to eliminate clogging of pipes due to terephthalic acid crystals and to oil the decomposition gas generated by thermal decomposition of waste plastic containing PET to efficiently obtain the required oil component. Become. Further, since the terephthalic acid crystals can be discharged together with a part of the cooling water, the terephthalic acid crystals and the circulating oil are separated by a centrifuge as in the oil liquefaction apparatus described in Patent Document 2. You don't have to. In the oil storage tank, an oil component having a required composition can be produced by condensing the decomposition gas that has not been condensed by the terephthalic acid sedimentation trap at a predetermined temperature.

It is predicted that the waste plastic contains PVC (polyvinyl chloride, commonly known as vinyl chloride). When PVC is thermally decomposed, chlorine gas is generated in the decomposed gas. Since chlorine gas is water-soluble, it dissolves in cooling water and becomes hydrochloric acid. In such a case, it is possible to neutralize the cooling water after being discharged from the terephthalic acid sedimentation trap with a neutralizing agent (base). Alternatively, the neutralizing agent may be charged from the outside into the cooling water W that settles at the bottom of the terephthalic acid settling trap 5. By doing so, it is possible to suppress the exhaust of gas harmful to the environment even if PVC is mixed in the waste plastic.

[2] In the waste plastic oiling apparatus of the present invention, the terephthalic acid settling trap is a stirrer that agitates the decomposed gas, the terephthalic acid crystals, the cooling water, and the oil stock solution in a dispersed state. Is preferably arranged.

By stirring with a stirrer, it becomes possible to further disperse the terephthalic acid crystals, cooling water, oil stock solution and decomposition gas, promote cooling and condensation, and separate the terephthalic acid crystals, oil stock solution and cooling water. Can be promoted.

[3] In the waste plastic oiling apparatus of the present invention, the cooling water layer-separated in the terephthalic acid settling trap is circulated in the terephthalic acid crystallization section and the terephthalic acid settling trap, and the terephthalic acid settling. It is preferable to further have a cooler between the trap and the distillation cylinder portion.

By doing so, it is possible to reduce the amount of cooling water used for condensing the decomposition gas, reduce costs, and realize an environment-friendly waste plastic oiling device. Although the temperature of the cooling water after being sent to the terephthalic acid crystallization unit rises, it is possible to control the cooling water to an appropriate temperature by providing a cooler.

[4] In the waste plastic oil liquefaction apparatus of the present invention, it is preferable to further have an exhaust gas decomposition treatment unit that decomposes the decomposition gas that is not condensed in the oil storage tank into carbon dioxide gas and steam by a catalytic reaction and discharges the gas. ..

The oil stock solution sent from the terephthalic acid sedimentation trap is stored in the oil storage tank and maintained at a predetermined temperature. Gases whose boiling point is below the predetermined temperature are not condensed. If this gas is decomposed into carbon dioxide gas and water (water vapor) by a catalytic reaction in the exhaust gas decomposition treatment unit and discharged, the exhaust gas can be detoxified and deodorized and discharged.

[5] In the waste plastic oil liquefaction apparatus of the present invention, the oil storage tank is provided with a separation wall divided into two in the radial direction, and the oil stored in one of the compartments partitioned by the separation wall. The undiluted solution is separated into the oil undiluted solution and the water contained in the oil undiluted solution by using the difference in specific gravity, and the oil undiluted solution overflows the separation barrier and is stored in the other compartment, and the bottom of the oil storage tank. Is preferably provided with an on-off valve for discharging the water remaining in the one compartment and an on-off valve for discharging the oil stock solution having a required composition stored in the other compartment.

With such a configuration, water and the oil stock solution can be easily separated in the oil storage tank, only water can be discharged, and the oil stock solution having a required composition can be taken out.

[6] In the waste plastic oil liquefaction apparatus of the present invention, the oil stock solution disposed on the downstream side of the oil storage tank and stored in the oil storage tank is sequentially introduced from the one with the higher storage temperature to the one with the lower storage temperature. It further has a plurality of distilling heating tanks that heat with different temperatures, and a plurality of capacitors that condense each of the decomposition gases generated in each distilling heating tank, and the condensed oil component of the required composition. It is preferable to further have a plurality of oil storage tanks for storing each.

With this configuration, the decomposition gas generated by thermally decomposing waste plastic can be condensed at each predetermined temperature and recovered as an oil component having a required composition, for example, gasoline, kerosene, light oil, heavy oil, or the like. ..

[7] In the waste plastic oiling apparatus of the present invention, an exhaust gas decomposition treatment unit that decomposes a gas component that is not condensed by at least one of the plurality of capacitors into carbon dioxide gas and steam by a catalytic reaction and discharges the gas component is further provided. It is preferable to have.

If the gas that is not condensed by each capacitor in the exhaust gas decomposition treatment section is decomposed into carbon dioxide gas and water (water vapor) by a catalytic reaction and discharged as exhaust gas, the exhaust gas can be detoxified and deodorized and discharged.

[8] In the waste plastic oiling apparatus of the present invention, the oil component having a required composition generated by thermally decomposing the waste plastic is used as fuel, and the cooling water recirculated from each of the capacitors is converted into high-pressure steam to generate electricity. It is preferable to further have a steam turbine type generator.

By using the oil component thus obtained as fuel and using the electric power generated by the steam turbine generator as the operating electric power of the waste plastic oil liquefier, it is possible to save energy in the oil liquefier. Furthermore, it can be used as electric power for equipment other than the oil liquefaction device and lighting.

It is explanatory drawing which shows the structure of the oil liquefaction apparatus 1A of waste plastic which concerns on 1st Embodiment. It is a figure which shows the structure of the distillation cylinder part 3 and the terephthalic acid crystallization part 4. It is a process flow diagram which shows the main process of the method of oiling waste plastic using the waste plastic oiling apparatus 1A which concerns on 1st Embodiment. It is explanatory drawing which simplifies the structure of the fractional distillation part of the oil conversion apparatus 1B of waste plastic which concerns on 2nd Embodiment.

Hereinafter, the waste plastic oiling devices 1A and 1B according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. In the following description, the waste plastic oiling devices 1A and 1B may be simply referred to as the oiling device 1. The waste plastics to be oiled here include plastic products that are discarded after use, plastic slag produced in the manufacturing process of plastic products, and polystyrene, polypropylene, polyethylene, styrofoam (expanded styrene), and the like. It is a thermoplastic such as polystyrene terephthalate (PET).

[First Embodiment]
FIG. 1 is an explanatory diagram showing a configuration of an oligochemical device 1A according to the first embodiment of the present invention. The oil liquefier 1A includes a thermal decomposition tank 2 that thermally decomposes waste plastic P containing PET to generate a decomposition gas G0, a distillation cylinder portion 3 that heats the decomposition gas G0 above the sublimation point of terephthalic acid, and a distillation cylinder. Cooling water W is injected into the decomposition gas G0 heated in Part 3 to cool it, and the decomposition gas G0 is condensed into the oil stock solution D and the terephthalic acid produced by thermally decomposing PET is cooled and crystallized. It has a terephthalic acid crystallization unit 4, and a terephthalic acid settling trap 5 for storing a turbid liquid K of a terephthalic acid crystal T, a cooling water W, and an oil stock solution D. In the terephthalic acid sedimentation trap 5, the terephthalic acid crystals T, the cooling water W, and the oil stock solution D are layer-separated by utilizing the difference in specific gravity between the terephthalic acid crystals T, the cooling water W, and the oil stock solution D. An oil storage tank 6 is connected to the terephthalic acid sedimentation trap 5.

An extruder 7 is connected to the pyrolysis tank 2. The extruder 7 feeds the waste plastic P, which is a raw material, into the pyrolysis tank 2 while melting it. A pretreatment unit (not shown) is installed in the extruder 7 as needed. The pretreatment unit includes a washing machine that cleans the waste plastic P, a crusher that crushes the waste plastic P into a size and form that can be put into the extruder 7, and a compressor that compresses styrofoam and the like.

The pyrolysis tank 2 is a stirrer 14 that stirs a main body portion 12 having a conical bottom, a heater 13 disposed on the outer periphery of the main body portion 12, and waste plastic P1 disposed inside the main body portion 12 and agitated. And have. The waste plastic dissolved in the raw material waste plastic P is referred to as waste plastic P1. The main body 12 is installed on the base 15. The heater 13 is, for example, a ceramic heater, a high frequency coil, a heating wire, or the like. The ceramic heater is easy to form into an arbitrary shape and easy to control the temperature. When a high-frequency coil is used, the material of the main body 12 is iron or an iron-based alloy so that high-frequency heating is possible.

The stirrer 14 includes a rotary shaft 16, a stirrer blade 17 fixed to the bottom end of the rotary shaft 16, and a motor 18 provided outside the main body 12 to rotate the rotary shaft 16. The stirrer 14 has a function of stirring the waste plastic P1 with a stirring blade 17 to make the temperature of the waste plastic P1 uniform, and a function of scraping off the dissolution residue of the waste plastic P1 adhering to the bottom of the main body 12. A temperature sensor (not shown) for detecting the temperature is arranged in the main body 12, and the power supplied to the heater 13 is controlled to appropriately manage the internal temperature. The internal temperature of the pyrolysis tank 2 is controlled to 300 ° C. to 500 ° C., preferably 350 ° C. to 450 ° C. When the temperature is set to 350 ° C., the oil component having a composition that solidifies at room temperature can be thermally decomposed, and when the temperature is set to 450 ° C., unnecessary energy consumption can be suppressed.

The main body 12 is provided with an input port 20 for charging an adsorbent such as zeolite. Zeolites have a function of adsorbing water and adsorbing odors (deodorizing) in the main body 12. Further, the bottom of the main body 12 is provided with a discharge port 21 for removing the dissolution residue of the waste plastic P1. The zeolite can be omitted if the waste plastic P to be charged is sufficiently washed and dried. Further, a vent (not shown) may be provided to allow the decomposition gas G0 generated by thermal decomposition to escape to the outside when the pressure inside the main body 12 becomes equal to or higher than a predetermined value. It is preferable to provide a filter for removing harmful substances, particles and the like in this vent.

FIG. 2 is a diagram showing the configuration of the distillation cylinder portion 3 and the terephthalic acid crystallization portion 4, and is a cross-sectional view showing a cut surface cut along the AA cutting line of FIG. As shown in FIGS. 1 and 2, the distillation cylinder portion 3 includes a cylinder portion 25 extending in the horizontal direction and a partition wall 26 for partitioning the cylinder portion 25 into a lower partition chamber 25A and an upper partition chamber 25B. ,have. The lower compartment 25A is connected to the main body 12 of the pyrolysis tank 2 by the pipe 27A, and the upper compartment 25B is connected above the terephthalic acid sedimentation trap 5 by the pipe 27C (see FIG. 2). There is. One end of the tubular portion 25 is sealed by a lid member 28 (see FIG. 1). The partition wall 26 is provided with a plurality of holes 29 (see FIG. 2). A heater and a cooling tube (not shown) are arranged on the outer periphery of the side surface of the cylinder portion 25 to maintain the temperature inside the cylinder portion 25 within the range of the sublimation point of terephthalic acid of 300 ° C. or higher and 350 ° C. or lower. In the following description, this temperature control range may be described as the sublimation point of terephthalic acid. The decomposition gas G0 generated by thermally decomposing the waste plastic P1 in the thermal decomposition tank 2 is introduced into the distillation cylinder portion 3 via the pipe 27A.

Of the decomposition gas G0 introduced into the distillation cylinder 3, the decomposition gas having a boiling point equal to or lower than the sublimation point of terephthalic acid moves from the hole 29 of the partition wall 26 to the partition chamber 25B on the upper side, and is transferred to the pipe 27C and the decomposition gas. It is introduced into the terephthalic acid sedimentation trap 5 via the cooling pipe portion 30. The decomposition gas G2 having a boiling point equal to or higher than the sublimation point of terephthalic acid returns to the main body 12 from the partition chamber 25A through the pipe 27B while condensing, and is thermally decomposed together with the waste plastic P1 in the main body 12. A temperature sensor (not shown) is installed in the cylinder portion 25 to control the inside of the cylinder portion 25 to the sublimation point temperature of terephthalic acid.

As shown in FIG. 2, a pipe 27D for sending the cooling water W is connected to the intersection of the pipe 27C and the decomposition gas cooling pipe portion 30, and the cooling water W is jetted from a nozzle 31 provided at the tip of the pipe 27D. Then, the decomposition gas G0 introduced from the pipe 27C is dispersed in the cooling water W and cooled below the sublimation point of the terephthalic acid, and the decomposition gas G0 flows into the decomposition gas cooling pipe section 30. The decomposition gas that has been cooled in this process and is in the process of condensation is referred to as decomposition gas G1. The decomposition gas G1 is a state in which the decomposition gas G0 and the oil stock solution condensed into fine droplets are mixed. Due to the flow velocity of the cooling water W ejected from the nozzle 31, the tip direction of the nozzle 31 becomes a negative pressure, and the decomposition gas G0 is sucked into the cooling pipe 30 and sent to the terephthalic acid sedimentation trap 5 together with the cooling water W. The tip of the decomposition gas cooling tube portion 30 communicates with the terephthalic acid settling trap 5, and a nozzle 32 is provided at the tip of the decomposition gas cooling tube 30, so that the cooling water W is shower-shaped in the space above the terephthalic acid settling trap 5. Spray on. The pipe 27C is arranged in the heat insulating housing 33 in order to maintain the sublimation point temperature of terephthalic acid until the decomposition gas G0 reaches the decomposition gas cooling pipe 30.

As shown in FIG. 1, the terephthalic acid sedimentation trap 5 is a vertically long columnar tank, and the inside thereof is shielded from the outside air. The bottom side of the terephthalic acid sedimentation trap 5 has a conical narrow cross-sectional area, and an on-off valve 36 is provided at the bottom. A partition wall portion 37 having a narrow opening 37A on the lower side is provided at the central portion in the height direction of the terephthalic acid sedimentation trap 5. A stirrer 39 is arranged above the partition wall portion 37. The stirrer 39 includes a rotary shaft 40, a stirrer vane 41 fixed to the bottom end of the rotary shaft 40, and a motor 42 provided outside the upper side of the terephthalic acid sedimentation trap 5 to rotate the rotary shaft 40. To. In the terephthalic acid sedimentation trap 5, the space above the partition wall 37 is the oil stock solution D, the terephthalic acid crystal T, the cooling water W, and the decomposition that cannot be completely condensed in the layer above the partition wall 37 of the terephthalic acid sedimentation trap 5. This is a region where the gas is dispersed and is in the form of a spray.

The stirring blade 41 is further dispersed by stirring the dispersed decomposition gases G0 and G1, the terephthalic acid crystals T, the cooling water W, and the oil stock solution D, and the terephthalic acid crystals T, the oil stock solution D, and the cooling are cooled by cooling. Makes it easier to separate the water W. A cooling pipe 38 is wound around the side wall surface of the terephthalic acid settling trap 5, and the cooling pipe 38 is extended to the lower surface of the partition wall portion 37 to cool the inside of the terephthalic acid settling trap 5 to a predetermined temperature. The terephthalic acid crystals T, the cooling water W, and the turbid liquid K of the oil stock solution D cooled by the partition wall 37 are cooled by contacting the partition wall 37, and the condensation of the decomposition gas G1 and the crystallization of terephthalic acid are promoted. To.

The turbid liquid K passes through the opening 37A of the partition wall 37 and is stored on the bottom side. The stored turbid liquid K is cooled below the sublimation point of terephthalic acid by a cooling pipe 38 wound around the lower side of the outer periphery of the terephthalic acid sedimentation trap 5, and the terephthalic acid crystallizes. The specific gravity of the components constituting the turbid liquid K is in the relationship of terephthalic acid crystals T> cooling water W> oil stock solution D> decomposition gas G3 that is not condensed by the terephthalic acid trap 5. That is, the terephthalic acid crystals T, the cooling water W, the oil stock solution D, and the decomposition gas G3 are separated in order from the bottom layer of the terephthalic acid sedimentation trap 5. The decomposition gas G3 collects in the uppermost layer of the terephthalic acid sedimentation trap 5. Since the terephthalic acid crystals T settle mainly in a mixed state with the cooling water W, the on-off valve 36 is opened after a lapse of a predetermined time and discharged to the outside together with a part of the cooling water.

The upper layer of the oil stock solution D of the terephthalic acid sedimentation trap 5 is connected to the oil storage tank 6 via the pipe 35B, and the supernatant of the oil stock solution D flows and is stored in the oil storage tank 6. On the other hand, the decomposition gas G3 is a gas that is not condensed even when cooled by the terephthalic acid sedimentation trap 5. A pipe 35A is connected to the layer of the decomposed gas G3 and is sent to the oil storage tank 6 via the pipe 35A.

In the terephthalic acid sedimentation trap 5, a pipe 27D is connected near the center of the layer of the cooling water W in the height direction, the cooling water W is cooled to a predetermined temperature by the cooler 10, and the terephthalic acid crystallization unit 4 and the pump 11 are used to cool the cooling water W to a predetermined temperature. It circulates between the terephthalic acid sedimentation traps 5. When the flow rate of the circulating cooling water W is insufficient, an independent water storage tank 34 can be prepared and connected to the pipe 27D to replenish the cooling water W. The cooler 10 is provided with a filter (not shown), and the filter is removed when the terephthalic acid crystals T are mixed in the cooling water W sent from the terephthalic acid settling trap 5. It prevents the pump 11 and the pipe 27D downstream from the pump 11 from being clogged by the terephthalic acid crystals T. Therefore, the filter may be provided near the cooling water outlet of the terephthalic acid sedimentation trap 5, and may be provided at a plurality of places. The oil stock solution D is sent to the oil storage tank 6 via the pipe 35B, cooled together with the decomposition gas G3 at a predetermined temperature, and the decomposition gas G3 is condensed to become oil having a required component.

The oil storage tank 6 is connected to the terephthalic acid settling trap 5 by a pipe 35B. The oil storage tank 6 is a cylindrical tank having a conical bottom, and is divided into two in the radial direction by a separation wall 43 extending from substantially the center of the bottom to a predetermined height in the height direction. It is divided into a water storage unit 44, which is a chamber, and an oil stock solution storage unit 45, which is the other compartment. The oil stock solution D and the decomposition gas G3 separated by the terephthalic acid sedimentation trap 5 are introduced into the water storage unit 44. The oil stock solution D and the decomposition gas G3 contain water (water vapor). Since the cooling water and the decomposition gas G0 are mixed in the terephthalic acid sedimentation trap 5, the temperature is below the sublimation point of the terephthalic acid, but it is not stable. A cooling pipe 46 is wound around the outer periphery of the oil storage tank 6 to cool the oil stock solution D and the decomposition gas G3 in the oil storage tank 6 to a predetermined temperature. Oil components having a boiling point of a predetermined temperature or higher are condensed into an oil stock solution D, which is temporarily stored in the water storage unit 44 in a state of being mixed with water. In the water storage unit 44, the lower layer is separated into water and the upper layer is separated into the oil stock solution D by the difference in specific gravity between the oil stock solution D and the water. The amount of the oil stock solution D is much larger than that of water, overflows the separation wall 43, and flows into the oil stock solution storage unit 45. On-off valves 47 and 48 are attached to each of the water storage unit 44 and the oil stock solution storage unit 45, and after a predetermined time elapses, the on-off valve 47 is released to discharge water, and the oil stock solution D uses the on-off valve 48. It is released and recovered as an oil component having the required composition.

In the oil storage tank 6, the decomposition gas G4 having a boiling point of a predetermined temperature or lower is introduced into the exhaust gas decomposition treatment unit 9 via the pipe 35C. The exhaust gas decomposition treatment unit 9 decomposes the decomposition gas G4 into carbon dioxide gas and water (steam) using a catalyst and discharges the decomposition gas Gh to the outside as exhaust gas Gh. Examples of the catalyst include oxide semiconductors (metal oxide semiconductors) such as TiO ₂ , Cr ₂ O ₃ , NiO, SnO ₂ , and ZnO, or precious metal particles such as Ag, Ru, Rh, Pd, In, Os, Ir, and Pt. And noble metal oxide particles are used. The oxide semiconductor decomposes the decomposition gas G4 into carbon dioxide and water by a radical reaction and an oxidation reaction in the true body region (for example, 300 ° C.) and in an oxygen environment. On the other hand, when the noble metal particles and the noble metal oxide particles are used as catalysts, the decomposition gas G4 is decomposed into carbon dioxide gas and water by a catalytic thermal reaction and discharged as exhaust gas Gh.

The extruder 7 is a so-called screw type extruder composed of a heating cylinder 50 having a heater arranged on the outer periphery thereof and a screw 51 rotating inside the heating cylinder 50. The waste plastic P charged from the hopper 52 is heated and melted in the heating cylinder 50 to the fluidization temperature and sent to the pyrolysis tank 2 by the screw 51. The screw 51 is rotated in one direction by a motor 53 provided outside. The drive wheel 54 is pivotally stopped on the motor 53, the driven wheel 55 is pivotally stopped on the screw 51, the belt 56 is suspended on the drive wheel 54 and the driven wheel 55, and the rotation of the motor 53 is transmitted to the screw 51. Will be done. The hopper 52 is provided with a throwing assist tool 57 for preventing clogging. The loading aid 57 constantly or periodically vibrates the waste plastic P in the hopper 52. The extruder 7 and the motor 53 are attached to the support base 58. By heating and melting the waste plastic P to the fluidization temperature by the extruder 7 and supplying it to the pyrolysis tank 2, the waste plastic P is continuously supplied and thermally decomposed without lowering the temperature in the pyrolysis tank 2. It will be possible to do. Subsequently, a method of oiling the waste plastic P using the oiling device 1 will be described with reference to FIGS. 1 to 3.

FIG. 3 is a process flow chart showing a main process of a method for oiling waste plastic P using the waste plastic oiling device 1 according to the first embodiment. The main component of the decomposition gas obtained by thermally decomposing the waste plastic P is a hydrocarbon, and the hydrocarbon is represented by the molecular formula CnHm (n, m is an integer of 1 or more), and the smaller the value of n, the lower the boiling point. The larger the value of n, the higher the boiling point. First, the waste plastic P is put into the extruder 7 from the hopper 52, and the waste plastic P is sent to the pyrolysis tank 2 while being heated and melted (step S1). The extruder 7 shears and fluidizes the waste plastic P1 by rotating the screw 51 while heating. The waste plastic P is subjected to pretreatment such as cleaning according to the state of the raw material, crushing into a size and form that can be put into the extruder 7, and compressing Styrofoam and sheets.

The thermal decomposition tank 2 thermally decomposes the waste plastic P1 supplied from the extruder 7 at 350 ° C. to 450 ° C. to generate a decomposition gas G0 (step S2). At a heating temperature of 350 ° C to 450 ° C, most of the thermoplastic is thermally decomposed to generate a decomposition gas G0.

The decomposition gas G0 is sent to the distillation cylinder portion 3. When there is a temperature drop in the pipe 27A, the distillation tube portion 3 is heated above the sublimation point of terephthalic acid (step S3). Terephthalic acid is a main component of polyethylene terephthalate (PET) and has sublimation properties, and has a sublimation point of 300 ° C. Therefore, if the heating temperature of the distillation cylinder 3 is set to 330 ° C., terephthalic acid does not crystallize in the distillation cylinder 3. If the decomposition gas G0 introduced from the thermal decomposition tank 2 into the distillation cylinder 3 can be maintained above the sublimation point of terephthalic acid, the distillation cylinder 3 does not have to be heated. In the distillation cylinder 3, the decomposition gas G0 having a boiling point of 330 ° C. or higher is condensed and returned to the thermal decomposition tank 2 and thermally decomposed together with the waste plastic P1. The decomposition gas G0 having a boiling point of 330 ° C. or lower is cooled by the terephthalic acid crystallization unit 4. The decomposition gas having a boiling point of 330 ° C. or lower contains an oil component having n of 19 or less in the molecular formula, that is, a heavy oil to a solvent or a fuel gas when condensed. The oil component having a boiling point of 330 ° C. or higher is a lubricating oil or petrolatum that solidifies at room temperature with n of 20 or higher in the molecular formula.

In the terephthalic acid crystallization section 4, the terephthalic acid is condensed and crystallized by injecting cooling water W from the distillation cylinder section 3 to the decomposition gas G0 flowing to the decomposition gas cooling tube section 30 and cooling it below the sublimation point (the terephthalic acid is condensed and crystallized. Step S4). In the cooling pipe 30, the decomposition gas G0 is in the process of being condensed (decomposition gas G1) and is introduced into the terephthalic acid sedimentation trap 5. The decomposition gas G1 is cooled by the terephthalic acid sedimentation trap 5 and temporarily stored in the terephthalic acid sedimentation trap 5 as the turbid liquid K. The terephthalic acid crystallization unit 4 starts injecting the cooling water W into the decomposition gas cooling pipe unit 30 in accordance with the start of the extruder 7 and the thermal decomposition tank 2, and the terephthalic acid sedimentation trap 5 starts the stirrer 39. In the terephthalic acid sedimentation trap 5, the turbid liquid K is layer-separated into terephthalic acid crystals T, cooling water W, and oil stock solution D by utilizing the difference in specific gravity (step S5). When the terephthalic acid crystal T has settled in a predetermined amount (or a predetermined time), the on-off valve 36 is released to discharge the terephthalic acid crystal T.

The decomposed gas G3 that does not condense in the terephthalic acid settling trap 5 is sent to the oil storage tank 6 and cooled to 50 ° C. to room temperature, and stored as the oil stock solution D together with the oil stock solution D sent from the terephthalic acid settling trap 5 (step S6). The composition of the decomposed gas having a boiling point of 50 ° C. or higher is represented by the molecular formulas C ₆ H ₁₄ to C ₁₉ H ₄₀ , and the condensed oil component includes gasoline to heavy oil. The decomposition gas G4 having a boiling point of 50 ° C. or lower is pentane (solvent) to methane (fuel gas) represented by C ₅ H ₁₂ to CH ₄ . In the oil storage tank 6, layer separation is performed using the difference in specific gravity between water and the oil stock solution D (step S7), and the oil stock solution D overflows the separation wall 43 and flows into the oil stock solution storage unit 45 to release the on-off valve 48. Then, it is recovered as a required oil component (step S8). The water remaining in the water storage unit 44 is discharged by releasing the on-off valve 47 (step S9). The decomposed gas G4 that does not condense in the oil storage tank 6 is decomposed into carbon dioxide gas and water (water vapor) by a catalytic reaction in the exhaust gas decomposition treatment unit 9, detoxified, and discharged to the outside.

The waste plastic oiling device 1A described above includes a thermal decomposition tank 2 that heats and thermally decomposes the waste plastic P, and a distillation cylinder that heats the decomposition gas G0 generated in the thermal decomposition tank 2 above the sublimation point of terephthalic acid. Part 3, the terephthalic acid crystallization unit 4 that injects cooling water W onto the heated decomposition gas G0 to condense into the oil stock solution D and crystallize terephthalic acid, and the decomposition gas G0 and the terephthalic acid crystal T to be cooled. The turbid liquid K of the water W and the oil stock solution D is stored, and the terephthalic acid crystal T, the cooling water W, the oil stock solution D, and the decomposition gas G3 which is not condensed among the decomposition gas G0 are separated by utilizing the difference in specific gravity. It has a terephthalic acid settling trap 5 and an oil storage tank 6 which is connected to the terephthalic acid settling trap 5 and stores the supernatant of the oil stock solution D in the terephthalic acid settling trap 5 and further condenses the uncondensed decomposition gas G3. is doing.

Waste plastic P containing PET is thermally decomposed and condensed by injecting cooling water into the generated decomposition gas G0 to generate terephthalic acid crystals T and oil stock solution D, and then terephthalic acid crystals T and cooling water W. And the oil stock solution D are layer-separated using the difference in specific gravity, and the terephthalic acid crystal T is discharged to the outside. By doing so, clogging of pipes due to terephthalic acid crystals T is eliminated, and the decomposition gas generated by thermal decomposition of waste plastic P containing PET is oiled to efficiently obtain an oil component having a required composition. It becomes possible. Further, since the terephthalic acid crystal T can be discharged together with a part of the cooling water, the terephthalic acid crystal and the circulating oil are separated by a centrifuge as in the oil liquefaction apparatus described in Patent Document 2. You don't have to. In the oil storage tank, the decomposition gas G3 that has not been condensed by the terephthalic acid sedimentation trap 5 can be condensed at a predetermined temperature to generate an oil component having a required composition.

Inside the terephthalic acid sedimentation trap 5, a stirrer 14 for stirring the dispersed decomposition gases G0 and G1, the terephthalic acid crystals T, the cooling water W, and the oil stock solution D is arranged. By stirring with the stirrer 14, the terephthalic acid crystal T, the cooling water W, the oil stock solution D and the decomposition gas G0 can be further dispersed to promote cooling and condensation, and the terephthalic acid crystal T and the oil stock solution can be promoted. D, it becomes possible to promote the separation of the cooling water W.

It is predicted that the waste plastic P contains PVC (polyvinyl chloride, commonly known as vinyl chloride). When PVC is thermally decomposed, chlorine gas is generated in the decomposed gas. Since chlorine gas is water-soluble, it dissolves in the cooling water W to become hydrochloric acid. Therefore, it is possible to neutralize the cooling water discharged from the terephthalic acid sedimentation trap 5 with a neutralizing agent (base). Alternatively, the neutralizing agent may be charged from the outside into the cooling water W that settles at the bottom of the terephthalic acid settling trap 5. By doing so, even if PET and PVC are mixed in the waste plastic P, it is possible to suppress the exhaust of gas harmful to the environment.

Further, in the waste plastic oiling device 1A, the cooling water W layer-separated in the terephthalic acid settling trap 5 is circulated to the terephthalic acid crystallization unit 4 and the terephthalic acid settling trap 5, and the terephthalic acid settling trap and the above are mentioned. A cooler 10 is provided between the distillation cylinders. By doing so, the amount of the cooling water W that cools and condenses the decomposition gas G0 can be suppressed, the cost can be reduced, and the environment-friendly waste plastic oiling device 1A can be realized. Although the temperature of the cooling water W after being sent to the terephthalic acid crystallization unit 4 rises, it is possible to control the cooling water W to an appropriate temperature by providing the cooler 10.

Further, the waste plastic oil liquefaction device 1 has an exhaust gas decomposition treatment unit 9 that decomposes the gas component that is not condensed in the oil storage tank 6 into carbon dioxide gas and steam by a catalytic reaction and discharges the gas component. The oil stock solution D sent from the terephthalic acid sedimentation trap 5 is stored in the oil storage tank 6 and maintained at a predetermined temperature. A gas having a boiling point equal to or lower than the predetermined temperature is a decomposed gas G4 in a gas state without being condensed. If the decomposed gas D4 is decomposed into carbon dioxide gas and water (water vapor) by a catalytic reaction in the exhaust gas decomposition treatment unit 9 and discharged, the exhaust gas Gh can be detoxified and deodorized and discharged. If a base is used as a catalyst, chlorine gas generated when PVC is thermally decomposed can be neutralized and discharged.

Further, the oil storage tank 6 is provided with a separation wall 43 that is divided into two in the radial direction, and the oil stock solution D is temporarily stored in the oil stock solution storage section 45, which is one of the compartments partitioned by the separation wall 43, to temporarily store the oil stock solution D. The oil stock solution D is separated into the oil stock solution D and the water contained in the oil stock solution D, and the oil stock solution D having a smaller specific gravity than the water overflows the separation wall 43 and flows into the oil stock solution storage section 45 which is the other compartment. At the bottom of the oil storage tank 6, there is an on-off valve 47 for discharging the water remaining in the lower layer of the water storage unit 44, and an on-off valve 48 for discharging the oil stock solution D having a required composition stored in the oil stock solution storage unit 45. Are arranged.

With this configuration, if the crude oil D produced by thermally decomposing waste plastic is condensed at a predetermined temperature, it is recovered as an oil component having a required composition, for example, an oil component such as gasoline, kerosene, light oil, and heavy oil. It becomes possible.

[Second Embodiment]
Subsequently, the waste plastic oiling device 1B according to the second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the oil stock solution D obtained by thermal decomposition in the oil liquefaction apparatus 1A according to the first embodiment is further fractionated into oil components having a required composition, for example, gasoline, kerosene, light oil, heavy oil, or the like. It is characterized by including a plurality of fractional distillation portions 61.

FIG. 4 is a configuration explanatory view showing a simplified configuration of the fractional distillation portion 61 of the waste plastic oiling apparatus 1A according to the second embodiment. In the following description, the waste plastic oiling device 1B may be simply referred to as an oiling device 1B. As described in the first embodiment, in the oil liquefaction apparatus 1A, the waste plastic P is thermally decomposed and the oil stock solution D is stored in the oil storage tank 6. When the cooling temperature of the oil storage tank 6 is 50 ° C., light oil such as gasoline represented by the molecular formulas C6H14 to C19H40 to heavy oil such as heavy oil are stored in the oil storage tank 6. The fractional distillation unit 61 is composed of a plurality of fractional distillation heating tanks 62A, 62B, 62C, 62D, a plurality of capacitors 63A, 63B, 63C, 63D, and a plurality of oil storage tanks 64A, 64B, 64C, 64D. .. A heater 21 is provided in the fractional distillation heating tanks 62A, 62B, 62C, and 62D, and the heating temperature is set for each fractional distillation heating tank. The configuration of the distilling unit 61 described below is an example, and the temperature of each distilling heating tank and the number of distilling heating tanks are not limited.

The oil stock solution D temporarily stored in the oil storage tank 6 is sent to the distilling heating tank 62A via the pipe 65A and heated. In the distilling heating tank 62A, the oil stock solution D is heated to 175 ° C. to gasify the components having a boiling point of 175 ° C. or lower. The gas component vaporized at this temperature is a component whose molecular formula n is represented by 10 or less and becomes gasoline or fuel gas, and is sent to the condenser 63A via the pipe 66A and cooled to 50 ° C. or lower. To. Cooling water is sent to the condenser 63A by the pipe 67A. The decomposed gas condensed by the condenser 63A is stored in the oil storage tank 64A as gasoline.

The oil stock solution D1 that remains as a liquid without being vaporized in the distilling heating tank 62A is sent to the distilling heating tank 62B via the pipe 65B and heated. In the distilling heating tank 62B, the oil stock solution D1 is heated to 260 ° C. to gasify the components having a boiling point of 260 ° C. or lower. The decomposition gas vaporized at this temperature has n represented by 11 to 14 in the molecular formula, and the main component is kerosene, which is sent to the condenser 63B via the pipe 66B and cooled to 50 ° C. or lower. Cooling water is sent to the condenser 63B by the pipe 67A. The decomposed gas condensed by the condenser 63B is stored in the oil storage tank 64B as kerosene.

The oil stock solution D2 that remains as a liquid without being gasified in the distilling heating tank 62B is sent to the distilling heating tank 62C via the pipe 65C and heated. In the distilling heating tank 62C, the oil stock solution D2 is heated to 280 ° C. to vaporize the components having a boiling point of 280 ° C. or lower. The gas component vaporized at this temperature has n represented by 15 and 16 in the molecular formula, and the main component is light oil, which is sent to the capacitor 63C via the pipe 66C and cooled to 50 ° C. or lower. Cooling water is sent to the condenser 63C by the pipe 67A. The decomposed gas condensed by the condenser 63C is stored in the oil storage tank 64C as light oil.

The oil stock solution D3 that remains as a liquid without being vaporized in the distilling heating tank 62C is sent to the distilling heating tank 62D via the pipe 65D and heated. In the distilling heating tank 62D, the oil stock solution D3 is heated to 330 ° C. to vaporize the components having a boiling point of 330 ° C. or lower. The gas component vaporized at this temperature has n represented by 17, 18, and 19 in the molecular formula, and the main component is heavy oil, which is sent to the minute capacitor 63D via the pipe 66D and cooled to 50 ° C. or lower. Will be done. Cooling water is sent to the condenser 63D by the pipe 67A. The gas condensed by the condenser 63D is stored in the oil storage tank 64D as heavy oil. Vaseline and candle components having a molecular formula of 20 to 40 and having n of 20 to 40 remain in the oil storage tank 64D as fractional distillation residues, and these are later artificially discharged.

The cooling water sent from the water tank 68 to the capacitors 63A, 63B, 63C, 63D by the pump 69 is connected to the steam turbine generator 70 via the pipe 67B. The steam turbine generator 70 includes a boiler that converts cooling water into high-pressure steam, and a turbine and a generator that rotate with high-pressure steam. The electric power generated by the steam turbine generator 70 is supplied to a motor, a heater, and the like driven by the oil liquefaction device 1A or the oil liquefaction device 1B. The high-pressure steam used in the steam turbine generator 70 is cooled by the cooling device 71, stepped down, and returned to the water tank 68. As the fuel for driving the turbine generator 70, it is possible to use an oil component having a required composition generated and recovered by the oil liquefaction device 1A or the oil liquefaction device 1B.

As described above, the decomposed gas G4 that is not condensed in the oil storage tank 6 is introduced into the exhaust gas decomposition treatment unit 9 via the pipe 35C, decomposed into carbon dioxide gas and water (water vapor) using a catalyst, and is used as exhaust gas Gh to the outside. It is discharged. Similarly, fuel gas such as pentane, ethane, and methane having a molecular formula that is not condensed by the condenser 63A and having n of 5 or less is sent to the exhaust gas decomposition treatment unit 9 and decomposed into carbon dioxide and water (water vapor) by a catalytic reaction and discharged. Will be done.

The oil storage tanks 64A, 64B, 64C, and 64D are provided with vents (not shown), and when the internal pressure of each of these oil storage tanks reaches a predetermined pressure or higher, the pressure is released by the vents. Further, it is preferable that the gas released from the vent is collected in the exhaust gas decomposition treatment unit 9 and decomposed by a catalyst to be discharged.

In the oil liquefaction apparatus 1B according to the second embodiment described above, the oil stock solution D stored in the oil storage tank 6 is sequentially introduced to the downstream side of the oil storage tank 6 from the one with the higher storage temperature to the one with the lower storage temperature. A plurality of distilling heating tanks 62A to 62D that heat with different temperatures, a plurality of capacitors 63A to 63D that condense each of the decomposition gases generated in each distilling heating tank, and condensed oil components having a required composition. Each has a plurality of oil storage tanks 64A to 64D for storing.

By providing the fractional distillation portion 61 in this way, the oil stock solution D in which the decomposition gas G0 generated by thermally decomposing the waste plastic P is condensed is recovered as an oil component having a composition such as gasoline, kerosene, light oil or heavy oil. Can be done. The generated oil component having a required composition is an example, and the oil component can be further subdivided by subdividing the heating temperature. For example, if the heating temperature of the distilling heating tank 62A is 174 ° C, 151 ° C, 126 ° C, 98 ° C, and 69 ° C, the gasoline generally referred to as C ₁₀ H ₂₂ (decane) and C ₉ H ₂₀ , respectively, are used. It can be recovered as an oil component such as (nonane), C ₈ H ₁₈ (octane), C ₆ H ₁₄ (heptane), and C ₄ H ₁₀ (hexane).

Further, the oil liquefaction apparatus 1B has an exhaust gas decomposition treatment unit that decomposes the decomposition gas that is not condensed by at least one of the plurality of capacitors into carbon dioxide gas and steam by a catalytic reaction and discharges the gas. The exhaust gas decomposition treatment unit 9 can be used in common with the exhaust gas decomposition treatment unit 9 (see FIG. 1) described in the first embodiment. When the cooling temperature of the condenser 63A is 50 ° C., fuel gas such as methane or propane having a boiling point of 50 ° C. or lower is not condensed by the condenser 63A. If these decomposition gases are decomposed into carbon dioxide gas and water (steam) by the catalytic reaction of the exhaust gas decomposition treatment unit 9 and discharged, the exhaust gas can be detoxified and deodorized and discharged. In addition to the capacitor 63A, one or all of the capacitors 63B, 63C, 64D may be connected to the exhaust gas decomposition treatment unit 9.

Further, the oil conversion device 1B is a steam turbine type generator that uses an oil component having a required composition generated by thermally decomposing waste plastic P as fuel and converts the cooling water that recirculates in each of the capacitors into high-pressure steam to generate electricity. Have. By using the oil component thus obtained as fuel and using the power generated by the steam turbine generator as the operating power of the waste plastic oil liquefaction device 1B, it is possible to save energy in the oil smelter. .. Furthermore, it can be used as electric power for equipment other than the oil liquefaction device and lighting. In the oil conversion device 1A having no distilling portion 61, cooling water W water is introduced from the cooling pipe 38 provided in the terephthalic acid trap 5 to drive the steam turbine type generator 70 to generate electric power. You may use it.

The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like to the extent that the object of the present invention can be achieved are included in the present invention. For example, in the first embodiment described above, the screw type extruder 7 is adopted, but a melting tank is provided in place of the extruder 7, the waste plastic P is melted and fluidized, and the pyrolysis tank 2 is used with a gear pump or the like. You may send it to.

Further, in the first embodiment described above, the separation wall 43 is installed in the oil storage tank 6 to separate water (cooling water W) and the oil stock solution D. For example, water (cooling water W) and water (cooling water W) without installing the separation wall 43. The cooling water W) and the oil stock solution D may be separated by using the difference in specific gravity, or an oil storage tank for storing only the oil stock solution D may be provided in the oil storage tank 6.

Further, in the above-mentioned second embodiment, the heating tanks 62A, 62B, 62C, 62D for fractional distillation are provided for each oil component. For example, these are fractionated from an oil component having a high boiling point to an oil component having a low boiling point. It may be one of the fractional distillation towers.

Further, in the above-mentioned second embodiment, the steam turbine generator 70 is used as the power generation device, but the thermal power generation element is provided on the outer peripheral wall of the pyrolysis tank 2 and the heating tanks 62A, 62B, 62C, 62D for storage. It may be attached.

1A, 1B ... Waste plastic oil liquefier, 2 ... Thermal decomposition tank, 3 ... Distilling cylinder, 4 ... Telephthalic acid crystallizing part, 5 ... Telephthalic acid sedimentation trap, 6 ... Oil storage tank, 7 ... Extruder, 9 ... Exhaust gas decomposition treatment section, 10 ... Cooler, 12 ... Main body section, 14,39 ... Stirrer, 25A, 25B ... Section room, 26 ... Section wall, 43 ... Separation wall, 44 ... Water storage section (one section room) , 45 ... Oil stock solution storage unit (the other compartment), 47, 48 ... On-off valve, 62A-62D ... Dividing heating tank, 63A-63D ... Condenser, 64A-64D ... Oil storage tank, 70 ... Steam turbine generator , D ... oil stock solution, G0 ... decomposition gas, K ... turbid liquid, P ... waste plastic, P1 ... dissolved waste plastic, T ... terephthalic acid crystals, W ... cooling water

Claims (8)

A pyrolysis tank that heats waste plastic and thermally decomposes it,
A distillation cylinder that heats the decomposition gas generated in the pyrolysis tank above the sublimation point of terephthalic acid, and
A terephthalic acid crystallization unit that injects cooling water into the heated decomposition gas to condense it in an oil stock solution and crystallize the terephthalic acid.
The decomposition gas, the terephthalic acid crystals, the cooling water, and the turbid liquid of the oil stock solution are stored, and the terephthalic acid crystals, the cooling water, and the oil stock solution are layer-separated by utilizing the difference in specific gravity. Terephthalic acid sedimentation trap and
An oil storage tank connected to the terephthalic acid sedimentation trap and storing the supernatant of the oil stock solution in the terephthalic acid sedimentation trap.
It is a waste plastic oil liquefaction device that has
The distillation cylinder portion includes a cylinder portion extending in the horizontal direction, a first pipe connecting the cylinder portion to the pyrolysis tank, and a second pipe connecting the cylinder portion to the terephthalic acid crystallization portion. The tubular portion is divided into a lower compartment and an upper compartment by a partition wall provided with a plurality of holes, and the first pipe is connected to the lower compartment of the cylinder. , The second pipe is connected to the upper section chamber of the cylinder portion.
The terephthalic acid crystallization unit has a decomposition gas cooling pipe portion provided between the second pipe and the terephthalic acid sedimentation trap, and a third pipe, and the second pipe and the decomposition gas cooling portion are provided. The third pipe for sending cooling water is connected to the intersection of the pipes, and a nozzle for showering the cooling water is provided at the tip of the third pipe.
It is a waste plastic oil liquefaction device. In the waste plastic oiling apparatus according to claim 1,
The terephthalic acid sedimentation trap is provided with a stirrer for stirring the decomposed gas, the crystals of the terephthalic acid, the cooling water, and the oil stock solution in a dispersed state.
It is a waste plastic oil liquefaction device. In the waste plastic oiling apparatus according to claim 1 or 2.
The cooling water layer-separated in the terephthalic acid sedimentation trap is circulated in the terephthalic acid crystallization unit and the terephthalic acid sedimentation trap.
Further having a cooler between the terephthalic acid sedimentation trap and the distillation cylinder.
It is a waste plastic oil liquefaction device. In the waste plastic oiling apparatus according to any one of claims 1 to 3.
It further has an exhaust gas decomposition treatment unit that decomposes the gas component that is not condensed in the oil storage tank into carbon dioxide gas and water vapor by a catalytic reaction and discharges the gas component.
It is a waste plastic oil liquefaction device. In the waste plastic oiling apparatus according to any one of claims 1 to 4.
The oil storage tank is provided with a separation wall that is divided into two in the radial direction.
The oil stock solution stored in one of the compartments partitioned by the separation wall is separated into the oil stock solution and water contained in the oil stock solution by using the difference in specific gravity, and the oil stock solution separates the separation wall. Overflowed and stored in the other compartment
At the bottom of the oil storage tank, an on-off valve for discharging the water remaining in the one compartment and an on-off valve for discharging the oil stock solution having a required composition stored in the other compartment are arranged. ing,
It is a waste plastic oil liquefaction device. In the waste plastic oiling apparatus according to any one of claims 1 to 5.
A plurality of distilling heating tanks arranged on the downstream side of the oil storage tank and sequentially introducing the oil stock solution stored in the oil storage tank from the one with the higher storage temperature to the one with a temperature difference to heat the oil stock solution. Has more,
A plurality of capacitors that condense each of the decomposition gases generated in each of the relevant reservoir heating tanks,
Multiple oil storage tanks that store each of the condensed oil components of the required composition,
Have more,
It is a waste plastic oil liquefaction device. In the waste plastic oiling apparatus according to claim 6.
It further has an exhaust gas decomposition treatment unit that decomposes the gas component that is not condensed by each of the distilling capacitors into carbon dioxide gas and water vapor by a catalytic reaction and discharges the gas component.
It is a waste plastic oil liquefaction device. In the waste plastic oiling apparatus according to claim 6 or 7.
Further having a steam turbine type generator that uses an oil component having a required composition generated by thermally decomposing the waste plastic as fuel and converts the cooling water refluxed from each of the capacitors into high-pressure steam to generate electricity.
It is a waste plastic oil liquefaction device.

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