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1. JP2022022286 - METHOD FOR PRODUCING BIS-(2-HYDROXYETHYL)TEREPHTHALATE AND METHOD FOR PRODUCING RECYCLED POLYETHYLENE TEREPHTHALATE

Office
Japan
Application Number 2021191788
Application Date 26.11.2021
Publication Number 2022022286
Publication Date 03.02.2022
Publication Kind A
IPC
C07C 69/82
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
69Esters of carboxylic acids; Esters of carbonic or haloformic acids
76Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a six-membered aromatic ring
80Phthalic acid esters
82Terephthalic acid esters
C08J 11/24
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
11Recovery or working-up of waste materials
04of polymers
10by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
18by treatment with organic material
22by treatment with organic oxygen-containing compounds
24containing hydroxyl groups
C07C 67/54
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
67Preparation of carboxylic acid esters
48Separation; Purification; Stabilisation; Use of additives
52by change in the physical state, e.g. crystallisation
54by distillation
C08G 63/183
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
63Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
02Polyesters derived from hydroxy carboxylic acids or from polycarboxylic acids and polyhydroxy compounds
12derived from polycarboxylic acids and polyhydroxy compounds
16Dicarboxylic acids and dihydroxy compounds
18the acids or hydroxy compounds containing carbocyclic rings
181Acids containing aromatic rings
183Terephthalic acids
CPC
C07C 67/54
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
67Preparation of carboxylic acid esters
48Separation; Purification; Stabilisation; Use of additives
52by change in the physical state, e.g. crystallisation
54by distillation
C07C 67/52
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
67Preparation of carboxylic acid esters
48Separation; Purification; Stabilisation; Use of additives
52by change in the physical state, e.g. crystallisation
C07C 69/82
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
CACYCLIC OR CARBOCYCLIC COMPOUNDS
69Esters of carboxylic acids; Esters of carbonic or haloformic acids
76Esters of carboxylic acids having a carboxyl group bound to a carbon atom of a six-membered aromatic ring
80Phthalic acid esters
82Terephthalic acid esters
C08J 11/16
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
11Recovery or working-up of waste materials
04of polymers
10by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
16by treatment with inorganic material
C08J 11/08
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
11Recovery or working-up of waste materials
04of polymers
06without chemical reactions
08using selective solvents for polymer components
C08J 11/10
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
11Recovery or working-up of waste materials
04of polymers
10by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
Applicants SHINTEKKU:KK
株式会社シンテック
JAPAN ENVIRONMENT PLANNING CO LTD
日本環境設計株式会社
Inventors TAKAO MASAKI
▲高▼尾 正樹
SAKAI TORU
堺 通
YAMAHARA KEI
山原 慧
INADA SHUJI
稲田 修司
FUJITA HIROSHI
藤田 博
Agents 特許業務法人IPX
Priority Data 2020111719 29.06.2020 JP
Title
(EN) METHOD FOR PRODUCING BIS-(2-HYDROXYETHYL)TEREPHTHALATE AND METHOD FOR PRODUCING RECYCLED POLYETHYLENE TEREPHTHALATE
(JA) ビス-(2-ヒドロキシエチル)テレフタレートの製造方法および再生ポリエチレンテレフタレートの製造方法
Abstract
(EN)

PROBLEM TO BE SOLVED: To provide a method for producing bis-(2-hydroxyethyl)terephthalate (BHET), the method allowing simple production of a BHET with high purity from a colored polyester waste.

SOLUTION: A method for producing a BHET according to the present invention comprises: a depolymerization step for mixing a polyester waste colored by a pigment, with a monoethylene glycol and a depolymerization catalyst, and depolymerizing the polyester waste to obtain a depolymerization product containing a crude colored BHET; a pigment decomposition and removal step for adding a pigment decomposition agent to the depolymerization product and cooling and centrifuging the resultant mixture, thereby separating extracted solids and a decomposition product of the pigment and removing at least a portion of the decomposition product from the depolymerization product; a concentration step for removing a low boiling-point component containing monoethylene glycol from the depolymerization product from which at least a portion of the decomposition product has been removed, and concentrating the crude BHET; and a collection step for collecting, by distillation, BHET from the concentrated crude BHET to obtain a BHET having higher purity than the crude BHET.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT


(JA) 【課題】着色されたポリエステル廃棄物から高純度のビス-(2-ヒドロキシエチル)テレフタレート(BHET)を簡便に製造し得るBHETの製造方法を提供すること。
【解決手段】本発明のBHETの製造方法は、色素により着色されたポリエステル廃棄物と、モノエチレングリコールおよび解重合触媒とを混合し、ポリエステル廃棄物を解重合して、着色した粗製BHETを含む解重合物を得る解重合工程と、解重合物に色素分解剤を添加するとともに冷却し、遠心分離することにより、析出した固形分と色素の分解物とを分離し、解重合物から分解物の少なくとも一部を除去する色素分解除去工程と、分解物の少なくとも一部が除去された解重合物から、モノエチレングリコールを含有する低沸点成分を除去して、粗製BHETを濃縮する濃縮工程と、濃縮された粗製BHETから、BHETを蒸留により回収して、粗製BHETより純度の高いBHETを得る回収工程とを有する。
【選択図】図1