Method for preparing refined lactide from recovered polylactic acid

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United States of America Patent

PATENT NO 9475790
APP PUB NO 20150065732A1
SERIAL NO

14534151

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Abstract

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A method for preparing lactide from recovered polylactic acid, the method including the following steps: A. pretreating the recovered polylactic acid; B. extruding the treated polylactic acid from a twin screw extruder to yield a polylactic acid melt, and introducing the polylactic acid melt to a pre-depolymerization kettle; C. carrying out a chain scission reaction to break molecular chains in the polylactic acid melt and to decrease the number-average molecular weight of the polylactic acid melt to below 5000; D. conducting depolymerization reaction to yield a crude lactide; and E. purifying the crude lactide and crystallizing the purified lactide.

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Patent Owner(s)

Patent OwnerAddress
XIAOGAN ESUN NEW MATERIAL CO LTD432000 XINHUA ROAD XIAONAN ECONOMIC DEVELOPMENT ZONE XIAOGAN CITY HUBEI PROVINCE XIAOGAN CITY HUBEI PROVINCE 432000

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Xu, Jie Xiaogan, CN 345 2150
Yang, Yihu Xiaogan, CN 2 0

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