Title:
RECOVERY METHOD FOR WASTE POLYESTER MATERIAL PERFORMED BY MEANS OF CONTINUOUS ALCOHOLYSIS AND CONTINUOUS TRANSESTERIFICATION
Document Type and Number:
WIPO Patent Application WO/2021/004070
Kind Code:
A1
Abstract:
The invention relates to a recovery method for a waste polyester material, in particular to a method for preparing dimethyl terephthalate (DMT) by recycling using a chemical method, belonging to the technical field of recovering waste polyesters. The processes of continuous feeding, continuous alcoholysis and continuous transesterification are used to enable homogeneous alcoholysis of materials in the molten state, and the required alcoholysis time is short. Two or more alcoholysis kettles are used in series for continuous alcoholysis, the quality of the alcoholyzate product is stable, and the alcoholysis products continuously enter the transesterification kettles for a continuous transesterification reaction. EG produced by the transesterification reaction can also be recycled during the alcoholysis step, thereby avoiding the occurrence of side reactions and the unstable quality of the transesterification product, and greatly improving the purity and yield of the product recovered from the waste polyester.
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Inventors:
FANG HUAYU (CN)
ZHU ENBIN (CN)
WANG DUBIN (CN)
YU GUOQING (CN)
LI TIANYUAN (CN)
CHEN JINCHENG (CN)
WU JIANTONG (CN)
CHEN JIANHUA (CN)
LIN SHENGYAO (CN)
ZHU ENBIN (CN)
WANG DUBIN (CN)
YU GUOQING (CN)
LI TIANYUAN (CN)
CHEN JINCHENG (CN)
WU JIANTONG (CN)
CHEN JIANHUA (CN)
LIN SHENGYAO (CN)
Application Number:
PCT/CN2020/076455
Publication Date:
January 14, 2021
Filing Date:
February 24, 2020
Export Citation:
Assignee:
AVANTGARDE SHANGHAI ENVIRONMENTAL TECH CO LTD (CN)
International Classes:
C08J11/24; C07C67/03; C07C69/82
Foreign References:
| CN110511137A | 2019-11-29 | |||
| KR20150105781A | 2015-09-18 | |||
| KR101347906B1 | 2014-01-08 | |||
| GB2041916A | 1980-09-17 | |||
| CN102040468A | 2011-05-04 | |||
| CN1413178A | 2003-04-23 | |||
| JP2006083125A | 2006-03-30 | |||
| US6706843B1 | 2004-03-16 |
Other References:
KIM BO-KYUNG; KIM DONGPIL; CHO YOUNGMIN; HAN MYUNGWAN: "Chemical recycling of poly(ethylene terephthalate) using a new hybrid process.", JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, vol. 41, no. 9, 20 September 2008 (2008-09-20), pages 923 - 928, XP009525439, ISSN: 0021-9592, DOI: 10.1252/jcej.07WE304
KIM SEUNGKYOM , HAN MYUNGWAN: "Methanolysis process for recycling polyester oligomer waste.", KOREAN CHEMICAL ENGINEERING RESEARCH, vol. 42, no. 1, 1 February 2004 (2004-02-01), pages 53 - 58, XP009525438, ISSN: 0304-128X
KIM SEUNGKYOM , HAN MYUNGWAN: "Methanolysis process for recycling polyester oligomer waste.", KOREAN CHEMICAL ENGINEERING RESEARCH, vol. 42, no. 1, 1 February 2004 (2004-02-01), pages 53 - 58, XP009525438, ISSN: 0304-128X
Attorney, Agent or Firm:
FUZHOU GEMHOPE PATENT AGENCY (CN)
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