METHOD FOR PREPARING REFINED LACTIDE FROM RECOVERED POLYLACTIC ACID
    1.
    发明申请
    METHOD FOR PREPARING REFINED LACTIDE FROM RECOVERED POLYLACTIC ACID 有权
    从回收的聚乙烯酸制备精制乳液的方法

    公开(公告)号:US20150065732A1

    公开(公告)日:2015-03-05

    申请号:US14534151

    申请日:2014-11-05

    发明人: Yihu YANG Jie XU

    IPC分类号: C07D319/12

    摘要: 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 polylacitc acid from a twin screw extruder to yield a polylacitc acid melt, and introducing the polylacitc 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.

    摘要翻译: 从回收聚乳酸制备丙交酯的方法,其方法包括以下步骤:A.预处理回收的聚乳酸; B.从双螺杆挤出机挤出经处理的聚赖氨酸,得到聚赖氨酸熔体,并将聚赖氨酸熔体引入预解聚釜中; C.进行断链反应以破坏聚乳酸熔体中的分子链,并将聚乳酸熔体的数均分子量降至5000以下; D.进行解聚反应,得到粗丙交酯; 和E.纯化粗丙交酯并使纯化的丙交酯结晶。