发明名称 |
Method for purifying hydroxycarboxylic acid, method for producing cyclic ester, and method for producing polyhydroxycarboxylic acid |
摘要 |
A process for purification of a hydroxycarboxylic acid by distillation, comprising: distilling a hydroxycarboxylic acid solution containing a high-boiling point hydroxy compound comprising at least one species selected from the group consisting of alcohols and phenols having a higher boiling point than the hydroxycarboxylic acid. As a result, a hydroxycarboxylic acid suitable as a starting material for production of a polyhydroxycarboxylic acid can be obtained. The purified hydroxycarboxylic acid is further polycondensed to provide a hydroxycarboxylic acid oligomer, which is de-polymerized to provide a cyclic ester comprising a dimer of the hydroxycarboxylic acid, and the cyclic ester is converted into a polyhydroxycarboxylic acid by ring-opening polymerization thereof.
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申请公布号 |
US8039548(B2) |
申请公布日期 |
2011.10.18 |
申请号 |
US20070309872 |
申请日期 |
2007.07.10 |
申请人 |
KUREHA CORPORATION |
发明人 |
OGAWA TOMOYUKI;KIKUCHI MICHIO |
分类号 |
C08G63/06;C07C51/42;C07C59/00;C07D307/00;C08G73/10 |
主分类号 |
C08G63/06 |
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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