Apparatus for regenerating poly(METH)acrylic acid ester, method for regenerating poly(METH)acrylic acid ester, and method for producing (METH)acrylic acid ester

Abstract

To provide an apparatus for regenerating a poly(meth)acrylic acid ester, with which water can be efficiently removed when a poly(meth)acrylic acid ester is regenerated; a method for regenerating a poly(meth)acrylic acid ester; and a method for producing a (meth)acrylic acid ester.SOLUTION: An apparatus 100 for regenerating a poly(meth)acrylic acid ester includes: a pyrolysis unit 10 that performs pyrolysis of a poly(meth)acrylic acid ester to obtain a gaseous pyrolysis product; a first cooling unit 20 that cools the gaseous pyrolysis product to obtain a liquid pyrolysis product; a refining unit 30 that performs refining of the liquid pyrolysis product to obtain a gaseous refined product; a second cooling unit 40 that cools the gaseous refined product to obtain a liquid refined product; and a dehydration unit 50 that removes water contained in at least one of the liquid pyrolysis product and the liquid refined product.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a regeneration treatment apparatus for poly(meth)acrylate, a regeneration treatment method for poly(meth)acrylate, and a production method for (meth)acrylate.

Background Art

[0002] (Meth)acrylate obtained by polymerizing (meth)acrylate has excellent transparency and further excellent weather resistance. Therefore, poly(meth)acrylate is widely used as a material for members constituting parts for automobiles, signboards, display devices, and the like.

[0003] On the other hand, with the recent rise in resource prices and the increasing awareness of environmental issues, the movement to recover and recycle (reuse as resources) molded bodies containing poly(meth)acrylate has been spreading.

[0004] As one of the recycling methods for molded bodies containing poly(meth)acrylate, a method of recovering a monomer obtained by thermal decomposition (depolymerization) of poly(meth)acrylate and using this monomer to produce a new molded body (hereinafter also referred to as chemical recycling) is known. Since poly(meth)acrylate can recover the monomer, which is a thermal decomposition product, in a high yield by heating at a relatively low temperature of about 300°C to 500°C, it is suitable for regeneration treatment by chemical recycling.

[0005] For example, Patent Document 1 describes a method of cooling and liquefying a gaseous thermal decomposition product obtained by heating a resin product containing poly(meth)acrylate in a heating furnace, and then purifying the liquefied thermal decomposition product by distillation to recover (meth)acrylate.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Since poly(meth)acrylate has the property of absorbing water, there is a risk that water may mix into the regeneration processing apparatus for poly(meth)acrylate. As a method for removing water mixed into the regeneration processing apparatus together with poly(meth)acrylate, there is a method of removing it in a purification step for removing impurities contained in the pyrolyzate. However, if the object to be purified contains water, the energy consumption required for the purification step may increase compared to the case where the object does not contain water. In view of the above circumstances, an embodiment of the present disclosure aims to provide a regeneration processing apparatus for poly(meth)acrylate that can efficiently remove water in the regeneration processing of poly(meth)acrylate, a regeneration processing method for poly(meth)acrylate, and a production method for (meth)acrylate.

Means for Solving the Problems

[0008] Means for solving the above problems include the following embodiments. <1>A pyrolysis unit that pyrolyzes poly(meth)acrylate to obtain a gaseous pyrolyzate, A first cooling unit that cools the gaseous pyrolyzate to obtain a liquid pyrolyzate, A purification unit that purifies the liquid pyrolyzate to obtain a gaseous purified product, A second cooling unit that cools the gaseous purified product to obtain a liquid purified product, A dehydration unit that removes water contained in at least one of the liquid pyrolyzate and the liquid purified product, and a regeneration processing apparatus for poly(meth)acrylate. <2>The regeneration processing apparatus according to <1>, wherein the dehydration unit includes a dehydration unit disposed upstream of the purification unit. <3>The dehydration unit includes a dehydration unit disposed on the downstream side of the purification unit, and the regeneration processing apparatus according to <1> or <2>. <4>The regeneration processing apparatus according to any one of <1> to <3>, further comprising a first storage unit for storing a liquid pyrolyzate. <5>The regeneration processing apparatus according to any one of <1> to <4>, further comprising a second storage unit for storing a liquid purified product. <6>The regeneration processing apparatus according to any one of <1> to <5>, wherein the purified product contains methyl (meth) acrylate. <7>A pyrolysis step of pyrolyzing a poly (meth) acrylate ester to obtain a gaseous pyrolyzate, A first cooling step of cooling the gaseous pyrolyzate to obtain a liquid pyrolyzate, A purification step of purifying the liquid pyrolyzate to obtain a gaseous purified product, A second cooling step of cooling the gaseous purified product to obtain a liquid purified product, A dehydration step of removing water contained in at least one of the liquid pyrolyzate and the liquid purified product, and a regeneration processing method of a poly (meth) acrylate ester. <8>A pyrolysis step of pyrolyzing a poly (meth) acrylate ester to obtain a gaseous pyrolyzate, A first cooling step of cooling the gaseous pyrolyzate to obtain a liquid pyrolyzate, A purification step of purifying the liquid pyrolyzate to obtain a gaseous purified product, A second cooling step of cooling the gaseous purified product to obtain a liquid purified product, A dehydration step of removing water contained in at least one of the liquid pyrolyzate and the liquid purified product, and a method for producing a (meth) acrylate ester.

Advantages of the Invention

[0009] According to an embodiment of the present disclosure, there are provided a regeneration processing apparatus for a poly (meth) acrylate ester capable of efficiently removing water in the regeneration processing of a poly (meth) acrylate ester, a regeneration processing method of a poly (meth) acrylate ester, and a method for producing a (meth) acrylate ester.

Brief Description of the Drawings

[0010]

Figure 1

Mode for Carrying Out the Invention

[0011] <First Embodiment> The first embodiment of the present disclosure is a pyrolysis unit that pyrolyzes poly(meth)acrylate to obtain a gaseous pyrolyzate, a first cooling unit that cools the gaseous pyrolyzate to obtain a liquid pyrolyzate, a purification unit that purifies the liquid pyrolyzate to obtain a gaseous purified product, a second cooling unit that cools the gaseous purified product to obtain a liquid purified product, and a dehydration unit that removes water contained in at least one of the liquid pyrolyzate and the liquid purified product, and is a reproduction processing apparatus for poly(meth)acrylate.

[0012] In the reproduction processing apparatus of the present embodiment, poly(meth)acrylate is pyrolyzed in the pyrolysis unit to obtain a gaseous pyrolyzate. The gaseous pyrolyzate may contain substances other than (meth)acrylate as impurities in addition to the (meth)acrylate to be recovered. Therefore, in the reproduction processing apparatus of the present embodiment, the pyrolyzate is purified in the purification unit in order to remove impurities contained in the pyrolyzate.

[0013] The pyrolyzate of poly(meth)acrylate may contain water as an impurity. The boiling point of water is 100°C, and the difference from the boiling point of methyl methacrylate, which is 101°C, is small. For this reason, if an attempt is made to separate methyl methacrylate and water in the purification unit, the energy consumption may increase due to an increase in the number of distillations or the like. Therefore, the playback processing apparatus of the present embodiment includes a first cooling unit that cools the gaseous pyrolysis product obtained in the pyrolysis unit to obtain a liquid pyrolysis product, a second cooling unit that cools the gaseous purified product obtained in the purification unit to obtain a liquid purified product, and a dehydration unit that removes water contained in at least one of the liquid pyrolysis product obtained in the first cooling unit and the liquid purified product obtained in the second cooling unit. That is, in the playback processing apparatus of the present embodiment, the removal of water in the regeneration processing of poly(meth)acrylate is mainly performed by the dehydration unit. Therefore, compared with the case where water is removed in the purification unit, the load on the purification process is effectively reduced. Hereinafter, the components included in the playback processing apparatus of the present embodiment will be described.

[0014] (Pyrolysis Unit) The playback processing apparatus of the present embodiment includes a pyrolysis unit. The pyrolysis unit performs pyrolysis of poly(meth)acrylate to obtain a gaseous pyrolysis product (hereinafter also referred to as a pyrolysis gas). As the pyrolysis unit, an apparatus having any conventionally known and suitable configuration capable of pyrolyzing poly(meth)acrylate can be applied. Examples of the pyrolysis unit include an extruder, a kneader, and a fluidized bed heater.

[0015] From the viewpoint of efficiently performing the pyrolysis treatment of poly(meth)acrylate, the pyrolysis unit preferably includes an extruder. Suitable examples of the extruder that can be included in the pyrolysis unit include twin-screw extruders such as a co-rotating twin-screw extruder and a counter-rotating twin-screw extruder. An extruder includes a raw material inlet, a cylinder, and a screw disposed inside the cylinder, and is a device capable of conveying the raw material introduced from the inlet in a predetermined direction while heating the raw material.

[0016] Examples of the kneader that can be included in the pyrolysis unit include, for example, the apparatus described in U.S. Patent No. 10301235.

[0017] Examples of the fluidized bed heater that may be included in the thermal decomposition section include, for example, the apparatus described in JP-A-2009-112902.

[0018] The temperature at which thermal decomposition of the poly(meth)acrylate occurs in the thermal decomposition section may be selected, for example, from the range of 300°C to 500°C, 400°C to 500°C, or 450°C to 500°C.

[0019] The poly(meth)acrylate supplied to the thermal decomposition section may be, for example, in the form of a molded article containing the poly(meth)acrylate. Examples of the molded article containing the poly(meth)acrylate include a cast molded article and an extruded molded article. From the viewpoint of affinity with chemical recycling treatment, a cast molded article is preferred as the molded article containing the poly(meth)acrylate. The molded article containing the poly(meth)acrylate may be a molded article recovered as waste after being used for a predetermined application. The size of the molded article containing the poly(meth)acrylate may be adjusted by cutting, pulverizing, etc.

[0020] The molded article containing the poly(meth)acrylate supplied to the thermal decomposition section may contain components other than the poly(meth)acrylate. Examples of the components other than the poly(meth)acrylate include, in addition to the water described above, additives such as a release agent, a polymerization regulator, a polymerization initiator, an ultraviolet absorber, a colorant, and substances derived from parts attached to the molded article containing the poly(meth)acrylate.

[0021] The poly(meth)acrylate supplied to the thermal decomposition section may contain polymethyl methacrylate (PMMA) or poly(methyl acrylate) (PMA), which is a polymer mainly composed of methyl methacrylate (MMA) or methyl acrylate (MA).

[0022] In the present disclosure, "(meth)acryl" includes acryl, methacryl, and combinations thereof.

[0023] In the present disclosure, "poly(meth)acrylate" means a polymer having a structural unit derived from a (meth)acrylate monomer having a (meth)acryloyl group. Preferred examples of the poly(meth)acrylate include a homopolymer composed only of a structural unit derived from a (meth)acrylate having an alkyl group with 1 to 4 carbon atoms, and a copolymer composed of a structural unit derived from a (meth)acrylate having an alkyl group with 1 to 4 carbon atoms and a structural unit derived from a vinyl monomer copolymerizable with the (meth)acrylate having an alkyl group with 1 to 4 carbon atoms (hereinafter also referred to as another vinyl monomer). The proportion of the monomer unit derived from another vinyl monomer in the copolymer is preferably more than 0% by mass and 15% by mass or less.

[0024] Specific examples of the (meth)acrylate having an alkyl group with 1 to 4 carbon atoms include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, tert-butyl (meth)acrylate, sec-butyl (meth)acrylate, and isobutyl methacrylate. Among these, methyl (meth)acrylate is more preferred.

[0025] Specific examples of the vinyl monomer copolymerizable with the (meth)acrylate having an alkyl group with 1 to 4 carbon atoms include (meth)acrylate esters other than (meth)acrylate esters having an alkyl group with 1 to 4 carbon atoms, such as cyclohexyl (meth)acrylate, benzyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, and monoglycerol (meth)acrylate; unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, maleic anhydride, and itaconic anhydride, or acid anhydrides thereof; nitrogen-containing monomers such as acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, diacetone acrylamide, and dimethylaminoethyl methacrylate; epoxy group-containing monomers such as allyl glycidyl ether, glycidyl acrylate, and glycidyl methacrylate; and styrene-based monomers such as styrene and α-methylstyrene.

[0026] (First cooling section) The regeneration treatment apparatus of this embodiment includes a first cooling section. The first cooling section cools the gaseous pyrolyzate obtained in the pyrolysis section to liquefy it. The temperature for cooling the gaseous pyrolyzate is preferably lower than the boiling point of the substance contained in the gaseous pyrolyzate as the target for recovery. When the gaseous pyrolyzate contains methyl methacrylate or methyl acrylate as the target for recovery, it is preferable to cool the gaseous pyrolyzate at a temperature lower than 101°C, which is the boiling point of methyl methacrylate, or lower than 80°C, which is the boiling point of methyl acrylate. The configuration of the first cooling section is not particularly limited, and known devices such as a condenser can be applied.

[0027] (Purification section) The regeneration treatment apparatus of this embodiment includes a purification section. The purification section purifies the liquid pyrolyzate obtained in the first cooling section to obtain a gaseous purified product. In the present disclosure, "purification of pyrolyzate" means increasing the proportion of the component to be recovered among the components contained in the pyrolyzate.

[0028] The liquid pyrolyzate introduced into the purification section may or may not contain water. When the liquid pyrolyzate introduced into the purification section contains water, water removal may or may not be performed in the purification section. The configuration of the purification section is not particularly limited, and known purification apparatuses such as a purification column can be applied.

[0029] (Second cooling section) The regeneration processing apparatus of the present embodiment includes a second cooling section. The second cooling section cools and liquefies the gaseous purified product obtained in the purification section. The temperature for cooling the gaseous purified product is preferably lower than the boiling point of the substance contained as the recovery target in the gaseous purified product. When the gaseous purified product contains methyl methacrylate or methyl acrylate as the recovery target, it is preferable to cool the gaseous purified product at a temperature lower than 101°C, which is the boiling point of methyl methacrylate, or lower than 80°C, which is the boiling point of methyl acrylate. The configuration of the second cooling section is not particularly limited, and known apparatuses such as a condenser can be applied.

[0030] (Dehydration section) The regeneration processing apparatus of the present embodiment includes a dehydration section. The dehydration section removes water contained in at least one of the liquid pyrolyzate obtained in the first cooling section and the liquid purified product obtained in the second cooling section. In the present disclosure, "water removal" includes both the case of completely removing the water contained in the pyrolyzate or the purified product and the case of reducing the amount of water contained in the pyrolyzate or the purified product to an acceptable level.

[0031] By including the dehydration section in the regeneration processing apparatus, the necessity of removing water from the pyrolyzate in the purification section is reduced, and the load related to the purification process is reduced. As a result, the regeneration process of poly(meth)acrylate can be carried out with less energy. Alternatively, effects such as suppression of the polymerization reaction of (meth)acrylate in the purification section can be expected.

[0032] In the regeneration processing device, the position where the dehydration unit is arranged is not particularly limited, and it may be upstream of the purification unit, downstream of the purification unit, or both upstream and downstream of the purification unit. From the viewpoint of effectively reducing the load of the purification process in the purification unit, it is preferable that the dehydration unit is at least arranged upstream of the purification unit.

[0033] The method for removing water contained in the liquid pyrolyzate or liquid purified product in the dehydration unit (hereinafter also referred to as the dehydration process) is not particularly limited. Specific examples of the dehydration process include liquid-liquid separation, freeze concentration separation, distillation separation, membrane separation, adsorption separation, absorption separation, ultrasonic atomization separation, chromatography, and the like.

[0034] From the viewpoint of the efficiency of the dehydration process, it is preferable that the dehydration process is carried out by bringing a substance having a dehydration function into contact with the liquid pyrolyzate or liquid purified product. Examples of the dehydration function include the function of adsorbing or absorbing water.

[0035] The dehydration process may be carried out in a state where the liquid pyrolyzate or liquid purified product is flowing or in a stationary state. From the viewpoint of the efficiency of the dehydration process, it is preferable that the dehydration process is carried out in a state where the liquid pyrolyzate or liquid purified product is flowing.

[0036] The amount of water removed from the liquid pyrolyzate or liquid purified product in the dehydration unit is not particularly limited. For example, the amount of water removed in the dehydration unit is preferably such that the moisture content of the liquid pyrolyzate or liquid purified product after the dehydration process is preferably 1% by mass or less, more preferably 0.5% by mass or less, still more preferably 0.1% by mass or less, and even more preferably 0.05% by mass or less.

[0037] The temperature at which the dehydration process is carried out may be a temperature at which the liquid pyrolyzate or liquid purified product does not gasify. When the liquid pyrolyzate or the liquid purified product contains methyl methacrylate or methyl acrylate, it is preferable to perform a dehydration treatment at a temperature lower than 101 °C, which is the boiling point of methyl methacrylate, or at a temperature lower than 80 °C, which is the boiling point of methyl acrylate.

[0038] (First storage section) The regeneration treatment apparatus of the present embodiment may include a first storage section for storing a liquid pyrolyzate. The first storage section is provided, for example, between the first cooling section and the purification section, stores the liquid pyrolyzate supplied from the first cooling section, and supplies the liquid pyrolyzate to the purification section. A dehydration section may be arranged inside the first storage section. The configuration of the first storage section is not particularly limited, and a known apparatus such as a tank can be applied.

[0039] (Second storage section) The regeneration treatment apparatus of the present embodiment may include a second storage section for storing a liquid purified product. The second storage section is provided, for example, on the downstream side of the second cooling section, and stores the liquid purified product supplied from the second cooling section. A dehydration section may be arranged inside the second storage section. The configuration of the second storage section is not particularly limited, and a known apparatus such as a tank can be applied.

[0040] (Partial condenser) The regeneration treatment apparatus of the present embodiment may include a partial condenser. The partial condenser condenses (liquefies) and removes a substance having a boiling point higher than that of the substance to be recovered (hereinafter also referred to as a high-boiling impurity) contained in the gaseous pyrolyzate obtained in the pyrolysis section. By arranging the partial condenser on the downstream side of the pyrolysis section, high-boiling impurities contained in the gaseous pyrolyzate can be removed, and the load of the purification treatment in the purification section can be further reduced.

[0041] Removal of high-boiling impurities by a fractionator is carried out, for example, at a temperature that is equal to or higher than the boiling point and lower than the ignition point of the substance to be recovered in the pyrolyzate, and lower than the boiling point and equal to or higher than the melting point of the high-boiling impurities. That is, the high-boiling impurities are removed while the pyrolyzate as a whole remains in a gaseous state. Examples of the high-boiling impurities removed by the fractionator include colorants that may be contained in the molded article together with the (meth)acrylic acid ester.

[0042] The regeneration processing apparatus of the present embodiment can include, without particular limitation, components other than the above-described components. For example, the regeneration processing apparatus of the present embodiment may include a pump, various measuring instruments, and the like. The means for connecting the components constituting the regeneration processing apparatus of the present embodiment is not particularly limited, and known piping can be applied.

[0043] Hereinafter, the regeneration processing apparatus of the present embodiment will be described with reference to the drawings. Note that in the drawings, only the shapes, sizes, and arrangements of the components are schematically shown to the extent that the present disclosure can be understood. The present disclosure is not limited by the following description, and each component can be modified without departing from the gist of the present disclosure.

[0044] FIG. 1 is a schematic diagram showing an example of the configuration of the regeneration processing apparatus of the present embodiment. The regeneration processing apparatus 100 shown in FIG. 1 includes a pyrolysis unit 10 that pyrolyzes poly(meth)acrylic acid ester to obtain a gaseous pyrolyzate, a first cooling unit 20 that cools the gaseous pyrolyzate to obtain a liquid pyrolyzate, a purification unit 30 that purifies the liquid pyrolyzate to obtain a gaseous purified product, a second cooling unit 40 that cools the gaseous purified product to obtain a liquid purified product, and a dehydration unit 50 that removes water contained in at least one of the liquid pyrolyzate and the liquid purified product. The regeneration processing apparatus 100 shown in FIG. 1 may include, as optional components, a first storage unit 60 that stores the liquid pyrolyzate and a second storage unit 70 that stores the liquid purified product. The reproduction processing apparatus 100 shown in FIG. 1 may include, as an optional component, a partial condenser 80 for removing high-boiling impurities in the pyrolysis product between the pyrolysis unit 10 and the first cooling unit 20.

[0045] The position of the dehydration unit 50 in the reproduction processing apparatus 100 is not particularly limited as long as it can remove water contained in the liquid pyrolysis product or the liquid purified product. The position where the dehydration unit 50 is disposed in the reproduction processing apparatus 100 may be one location or two or more locations.

[0046] When removing water contained in the liquid pyrolysis product by the dehydration unit 50, specific examples of the dehydration unit 50 included in the reproduction processing apparatus 100 include a dehydration unit 50a disposed between the first cooling unit 20 and the purification unit 30; a dehydration unit 50b disposed between the first cooling unit 20 and the first storage unit 60; a dehydration unit 50c disposed between the first storage tank 60 and the purification unit 30; and a dehydration unit 50d disposed inside the first storage tank 60.

[0047] When removing water contained in the liquid purified product by the dehydration unit 50, specific examples of the dehydration unit 50 included in the reproduction processing apparatus 100 include a dehydration unit 50e disposed between the second cooling unit 40 and the second storage unit 70; and a dehydration unit 50f disposed inside the second storage tank 70.

[0048] <Second Embodiment> The second embodiment of the present disclosure is a pyrolysis step of pyrolyzing poly(meth)acrylate to obtain a gaseous pyrolysis product, a first cooling step of cooling the gaseous pyrolysis product to obtain a liquid pyrolysis product, a purification step of purifying the liquid pyrolysis product to obtain a gaseous purified product, a second cooling step of cooling the gaseous purified product to obtain a liquid purified product, A dehydration step of removing water contained in at least one of the liquid pyrolyzate or the liquid purified product, and a method for regenerating a poly(meth)acrylate ester, including this step.

[0049] According to the method of this embodiment, the (meth)acrylate ester obtained by pyrolyzing the poly(meth)acrylate ester as a raw material can be recovered.

[0050] The method of this embodiment includes a dehydration step of removing water contained in at least one of the liquid pyrolyzate obtained in the first cooling step or the liquid purified product obtained in the second cooling step. By including the dehydration step, the load of the purification treatment in the purification step is effectively reduced. As a result, the regeneration treatment of the poly(meth)acrylate ester can be carried out with less energy. Alternatively, effects such as suppression of the polymerization reaction of the (meth)acrylate ester in the purification section can be expected.

[0051] The dehydration step may be carried out before the purification step, after the purification step, or both before and after the purification step. From the viewpoint of effectively reducing the load of the purification treatment in the purification step, it is preferable to carry out the dehydration step at least before the purification step.

[0052] The method of this embodiment can be carried out, for example, using the above-described poly(meth)acrylate ester regeneration treatment apparatus.

[0053] <Third Embodiment> The third embodiment of the present disclosure is A pyrolysis step of pyrolyzing a poly(meth)acrylate ester to obtain a gaseous pyrolyzate, A first cooling step of cooling the gaseous pyrolyzate to obtain a liquid pyrolyzate, A purification step of purifying the liquid pyrolyzate to obtain a gaseous purified product, A second cooling step of cooling the gaseous purified product to obtain a liquid purified product, A method for producing a (meth)acrylic acid ester, comprising a dehydration step of removing water contained in at least one of a liquid pyrolyzate or a liquid purified product.

[0054] According to the method of the present embodiment, a (meth)acrylic acid ester that can be a raw material for a poly(meth)acrylic acid ester can be produced.

[0055] The method of the present embodiment includes a dehydration step of removing water contained in at least one of a liquid pyrolyzate obtained in the first cooling step or a liquid purified product obtained in the second cooling step. By including the dehydration step, the load of the purification treatment in the purification step is effectively reduced. As a result, the regeneration treatment of the poly(meth)acrylic acid ester can be carried out with less energy. Alternatively, effects such as suppression of the polymerization reaction of the (meth)acrylic acid ester in the purification section can be expected.

[0056] The dehydration step may be carried out before the purification step, after the purification step, or both before and after the purification step. From the viewpoint of effectively reducing the load of the purification treatment in the purification step, it is preferable to carry out the dehydration step at least before the purification step.

[0057] The method of the present embodiment can be carried out, for example, using the above-described regeneration treatment apparatus for poly(meth)acrylic acid ester.

Explanation of Reference Numerals

[0058] 10 Pyrolysis section 20 First cooling section 30 Purification section 40 Second cooling section 50 Dehydration section 60 First storage section 70 Second storage section 80 Partial condenser 100 Regeneration treatment apparatus

Claims

1. A pyrolysis section that pyrolyzes a poly(meth)acrylate to obtain a gaseous pyrolyzate, A first cooling section that cools the gaseous pyrolyzate to obtain a liquid pyrolyzate, A purification section that purifies the liquid pyrolyzate to obtain a gaseous purified product, A second cooling section that cools the gaseous purified product to obtain a liquid purified product, A dehydration section that removes water contained in at least one of the liquid pyrolyzate and the liquid purified product, and a regeneration processing apparatus for poly(meth)acrylate.

2. The regeneration processing apparatus according to claim 1, wherein the dehydration section includes a dehydration section disposed upstream of the purification section.

3. The regeneration processing apparatus according to claim 1, wherein the dehydration section includes a dehydration section disposed downstream of the purification section.

4. The regeneration processing apparatus according to claim 1, further comprising a first storage section for storing the liquid pyrolyzate.

5. The regeneration processing apparatus according to claim 1, further comprising a second storage section for storing the liquid purified product.

6. The regeneration processing apparatus according to claim 1, wherein the purified product contains methyl (meth)acrylate.

7. A pyrolysis step of pyrolyzing a poly(meth)acrylate to obtain a gaseous pyrolyzate, A first cooling step of cooling the gaseous pyrolyzate to obtain a liquid pyrolyzate, A purification step of purifying the liquid pyrolyzate to obtain a gaseous purified product, A second cooling step of cooling the gaseous purified product to obtain a liquid purified product, A dehydration step of removing water contained in at least one of the liquid pyrolyzate and the liquid purified product, and a regeneration processing method for poly(meth)acrylate.

8. A pyrolysis step of pyrolyzing a poly(meth)acrylate ester to obtain a gaseous pyrolyzate, a first cooling step of cooling the gaseous pyrolyzate to obtain a liquid pyrolyzate, a purification step of purifying the liquid pyrolyzate to obtain a gaseous purified product, a second cooling step of cooling the gaseous purified product to obtain a liquid purified product, and a dehydration step of removing water contained in at least one of the liquid pyrolyzate and the liquid purified product. A method for producing a (meth)acrylate ester.

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