发明名称 |
Production process of glycolide |
摘要 |
The invention provides a production process of glycolide comprising the respective steps of: Step 1 of heating a mixture containing a glycolic acid oligomer and a high boiling polar organic under normal or reduced pressure to reflux the mixture and at that time, conducting a total reflux operation in a reflux time within a range of 0.1 to 20 hours under conditions that substantially the whole amount of a distillate distilled out of a reflux system containing the mixture is refluxed into the reflux system; Step 2 of heating the mixture after the total reflux operation or a mixture obtained by adding the high boiling polar organic solvent to a glycolic acid oligomer component recovered from the mixture after the total reflux operation to conduct depolymerization; and Step 3 of collecting glycolide from a co-distillate. |
申请公布号 |
US8722907(B2) |
申请公布日期 |
2014.05.13 |
申请号 |
US200913142012 |
申请日期 |
2009.12.09 |
申请人 |
SUZUKI SHIGERU;YAMANE KAZUYUKI;ONO TOSHIHIKO;SUNAGAWA KAZUHIKO;KUREHA CORPORATION |
发明人 |
SUZUKI SHIGERU;YAMANE KAZUYUKI;ONO TOSHIHIKO;SUNAGAWA KAZUHIKO |
分类号 |
C07D319/00 |
主分类号 |
C07D319/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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