Title:
PROCESS AND SYSTEM FOR IMPLEMENTING CONTINUOUS PREPARATION OF HIGH-PURITY BHET MONOMER FROM WASTE POLYESTER
Document Type and Number:
WIPO Patent Application WO/2023/231628
Kind Code:
A1
Abstract:
A process and system for implementing the continuous preparation of a high-purity BHET monomer from waste polyester. The process comprises: first, carrying out screw extrusion melting and pre-alcoholysis on waste polyester in a screw extruder; then carrying out a primary alcoholysis reaction and a secondary alcoholysis reaction; then carrying out two thin film evaporation treatments on the alcoholysis product, and subsequently carrying out molecular distillation, so as to obtain a high-purity BHET monomer melt. The system comprises a screw extruder, a first alcoholysis kettle, a second alcoholysis kettle, an activated carbon adsorption device, a first thin film evaporator, a second thin film evaporator, a molecular distiller, a first melt filter, and a second melt filter. The process and the system can implement continuous preparation of a high-purity BHET monomer from waste polyester, have the advantages of being easy to operate and easy to be automated, require a small amount of ethylene glycol solvent, can achieve closed-loop recycling, and have the advantages of low energy consumption and remarkably reduced cost.
Inventors:
TANG GEN (CN)
XU HANSONG (CN)
ZHAO YONGBIN (CN)
XIE XIN (CN)
ZHOU SIWEI (CN)
XU HANSONG (CN)
ZHAO YONGBIN (CN)
XIE XIN (CN)
ZHOU SIWEI (CN)
Application Number:
PCT/CN2023/089358
Publication Date:
December 07, 2023
Filing Date:
April 19, 2023
Export Citation:
Assignee:
KOZA NOVEL MAT CO LTD (CN)
International Classes:
C08J11/10; C07C67/52; C07C69/82; C08L67/02
Domestic Patent References:
| WO2022003084A1 | 2022-01-06 |
Foreign References:
| JP2004346229A | 2004-12-09 | |||
| CN110527138A | 2019-12-03 | |||
| CN102532591A | 2012-07-04 | |||
| CN108641120A | 2018-10-12 | |||
| CN112646135A | 2021-04-13 | |||
| US20040182782A1 | 2004-09-23 |
Attorney, Agent or Firm:
SHANGHAI HISONG IP LAW FIRM (GENERAL PARTNERSHIP) (CN)
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