发明名称 |
Process For Purifying Hydroxycarboxylic Acid, Process For Producing Cyclic Ester, and Process For Producing Polyhydroxycarboxylic Acid |
摘要 |
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.
|
申请公布号 |
US2008214842(A1) |
申请公布日期 |
2008.09.04 |
申请号 |
US20050792234 |
申请日期 |
2005.10.17 |
申请人 |
OGAWA TOMOYUKI;HOSHI TOMOHIRO;KUSHIDA TSUTOMU;OTAWARA KENTARO |
发明人 |
OGAWA TOMOYUKI;HOSHI TOMOHIRO;KUSHIDA TSUTOMU;OTAWARA KENTARO |
分类号 |
C07D305/02;C07C53/00 |
主分类号 |
C07D305/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|