Method for recycling waste polyester

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United States of America Patent

PATENT NO 11926709
APP PUB NO 20210024718A1
SERIAL NO

17013674

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Abstract

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A method for recycling waste polyester, in particular to a method for recycling waste polyester by a modified alcoholysis method to recycle waste polyester to prepare dimethyl terephthalate (DMT), is provided and belongs to waste polyester recycling technology field. The waste polyester after dewatering and deoxygenation treatment is used as a raw material, in the step of feeding in melted state the alcoholysis agent is added in the melted waste polyester for preliminary alcoholysis, and the alcoholysis agent is ethylene glycol. On one hand, alcoholysis reaction occurs when the waste polyester raw material are melted, and at the same time, the viscosity of the melted material is reduced. Thus, the melted material remains melted at the alcoholysis temperature and is not easy to solidify again after entering the alcoholysis tank, ensuring that the alcoholysis is carried out under homogeneous conditions.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Jianhua Shanghai, CN 137 1945
Chen, Jincheng Shanghai, CN 17 70
Fang, Huayu Shanghai, CN 17 27
Li, Tianyuan Shanghai, CN 17 61
Lin, Shengyao Shanghai, CN 3 7
Wang, Dubin Shanghai, CN 4 8
Wu, Jiantong Shanghai, CN 7 8
Yu, Guoqing Shanghai, CN 23 152
Zhu, Enbin Shanghai, CN 3 7

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