Title:
CONTINUOUS ALCOHOLYSIS RECOVERY METHOD FOR WASTE POLYESTER
Document Type and Number:
WIPO Patent Application WO/2021/004068
Kind Code:
A1
Abstract:
The present invention relates to a recovery method for waste polyester material, particularly to a method for preparing dimethyl terephthalate DMT by means of the recovery of waste polyester using a chemical method, and relating to the technical field of waste polyester recycling; continuous feeding and continuous alcoholysis processes are used to subject the material in a molten state to homogeneous alcoholysis; the required alcoholysis time is short, more than two alcoholysis kettles are used in series to implement continuous alcoholysis, and the product quality of the alcoholysis product is stable; in addition, as the amount of EG used in the alcoholysis process is optimised, there is no need for distillation and concentration after the alcoholysis step is complete, and the alcoholysis product directly enters a transesterification kettle to undergo a transesterification reaction, in order to generate a pure DMT product.
Inventors:
FANG HUAYU (CN)
LI TIAN YUAN (CN)
ZHU ENBIN (CN)
WANG DUBIN (CN)
YU GUOQING (CN)
CHEN JINCHENG (CN)
WU JIANTONG (CN)
CHEN JIANHUA (CN)
LIN SHENGYAO (CN)
LI TIAN YUAN (CN)
ZHU ENBIN (CN)
WANG DUBIN (CN)
YU GUOQING (CN)
CHEN JINCHENG (CN)
WU JIANTONG (CN)
CHEN JIANHUA (CN)
LIN SHENGYAO (CN)
Application Number:
PCT/CN2020/076451
Publication Date:
January 14, 2021
Filing Date:
February 24, 2020
Export Citation:
Assignee:
AVANTGARDE SHANGHAI ENVIRONMENTAL TECH CO LTD (CN)
International Classes:
C08J11/10
Foreign References:
| CN110527138A | 2019-12-03 | |||
| KR20150105781A | 2015-09-18 | |||
| KR101347906B1 | 2014-01-08 | |||
| CN108003380A | 2018-05-08 | |||
| CN108727630A | 2018-11-02 | |||
| US6706843B1 | 2004-03-16 |
Other References:
See also references of EP 3786225A4
Attorney, Agent or Firm:
FUZHOU GEMHOPE PATENT AGENCY (CN)
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