发明名称 |
METHOD FOR THE PURIFICATION OF AN alpha -HYDROXY ACID ON AN INDUSTRIAL SCALE |
摘要 |
The present invention relates to a method for the purification of an alpha -hydroxy acid on an industrial scale, in which the method involves: (a) subjecting an aqueous stream containing mainly alpha -hydroxy acid (1) to an extraction step, with the formation of an aqueous place containing mainly alpha -hydroxy acid (2), (b) concentrating the aqueous phase containing mainly alpha -hydroxy acid (2) by means of evaporation of water under reduced pressure, with the formation of a concentrated alpha -hydroxy acid solution in water (3), and (c) subjecting the concentrated alpha -hydroxy acid solution (3) to a crystallization, with formation of pure alpha -hydroxy acid (4), where (i) the concentrated alpha -hydroxy acid solution (3) is directly cooled in a melting crystallization device, and/or (ii) the concentrated alpha -hydroxy acid solution (3) is diluted with water and crystallization is brought about in one or more cooling crystallization devices and/or evaporative crystallization devices, and/or (iii) crystallization is brought about in one or more adiabatic crystallization devices.
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申请公布号 |
WO0222545(A1) |
申请公布日期 |
2002.03.21 |
申请号 |
WO2001NL00683 |
申请日期 |
2001.09.14 |
申请人 |
PURAC BIOCHEM B.V.;VAN KRIEKEN, JAN;VAN BREUGEL, JAN |
发明人 |
VAN KRIEKEN, JAN;VAN BREUGEL, JAN |
分类号 |
C07C51/43;C07C51/44;C07C51/48;C07C59/06;C07C59/08;(IPC1-7):C07C51/43;A61K31/19 |
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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