发明授权
US08674056B2 Methods for producing lactide with recycle of meso-lactide 有权
用内消旋丙交酯循环生产丙交酯的方法

  • 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
  • 申请号: US13203211
    申请日: 2010-03-12
  • 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
Methods for producing lactide with recycle of meso-lactide
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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