发明名称 |
PROCESS FOR PURIFYING HYDROXYCARBOXYLIC ACID, PROCESS FOR PRODUCING CYCLIC ESTER, AND PROCESS FOR PRODUCING POLYLHYDROXYCABOXYLIC ACID |
摘要 |
<p>Disclosed is a process for purifying a hydroxycarboxylic acid, comprising: a crystallization step of subjecting a hydroxycarboxylic acid aqueous solution to crystallization for purification, a separation step of separating a hydroxycarboxylic acid crystal from a mother liquid, and a washing step of washing the hydroxycarboxylic acid crystal for further purification with a washing liquid, wherein the washing liquid is a hydroxycarboxylic acid aqueous solution. The purified or refined hydroxycarboxylic acid obtained through the above process is suitably used as a starting material for production of a polyhydroxycarboxylic acid. The above process is suitably included in a process for producing a cyclic ester and a process for producing a polyhydroxycarboxylic acid.</p> |
申请公布号 |
EP1824808(A1) |
申请公布日期 |
2007.08.29 |
申请号 |
EP20050795776 |
申请日期 |
2005.10.17 |
申请人 |
KUREHA CORPORATION |
发明人 |
OGAWA, TOMOYUKI;HOSHI, TOMOHIRO;KUSHIDA, TSUTOMU;OTAWARA, KENTARO |
分类号 |
C07C51/43;C07C59/06;C07D319/12;C08G63/78;C08L101/16 |
主分类号 |
C07C51/43 |
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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