发明授权
- 专利标题: Methods for producing lactide with recycle of meso-lactide
- 专利标题(中): 用内消旋丙交酯循环生产丙交酯的方法
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申请号: US13203211申请日: 2010-03-12
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公开(公告)号: US08674056B2公开(公告)日: 2014-03-18
- 发明人: Richard Douglas Benson
- 申请人: Richard Douglas Benson
- 申请人地址: US MN Minnetonka
- 专利权人: NatureWorks LLC
- 当前专利权人: NatureWorks LLC
- 当前专利权人地址: US MN Minnetonka
- 代理机构: Gary C Cohn PLLC
- 国际申请: PCT/US2010/027119 WO 20100312
- 国际公布: WO2010/105143 WO 20100916
- 主分类号: C08G63/08
- IPC分类号: C08G63/08
摘要:
An S,S- and R,R-lactide stream suitable for polymerization is prepared by producing a low molecular weight poly(lactic acid), depolymerizing the low molecular weight poly(lactic acid) to form a mixture of S,S-, R,R- and meso-lactide, and separating meso-lactide from this mixture to form an S,S- and R,R-lactide stream. Meso-lactide is recycled into the process, and shifts the mole fractions of the lactides in the lactide mixture that is produced.
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