发明授权
- 专利标题: Method for the removal and recovery of lactide from polylactide
- 专利标题(中): 从聚丙交酯去除和回收丙交酯的方法
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申请号: US09367381申请日: 1999-08-13
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公开(公告)号: US06187901B1公开(公告)日: 2001-02-13
- 发明人: Jukka Koskinen , Johan-Fredrik Selin , Nikitas Katsaras , Kari Kaariainen
- 申请人: Jukka Koskinen , Johan-Fredrik Selin , Nikitas Katsaras , Kari Kaariainen
- 优先权: FI970649 19970214; FI970650 19970214
- 主分类号: C08G6308
- IPC分类号: C08G6308
摘要:
The invention relates to a method for the removal of lactide from polylactide and recovery of lactide from a lactide-containing gas by cooling the hot lactide-containing gas, wherein a polymer melt traveling through a nozzle forms thin threads the surface area of which is so large that in a normal-pressure or vacuum evaporator the lactide evaporates from the polymer rapidly into a hot carrier-gas flow and the polymer settles under gravity onto a collecting device. A hot lactide-containing gas is cooled rapidly to a temperature below 100° C., whereupon the lactide crystallizes from gas, forming lactide crystals, which are separated from the gas.
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