发明名称 |
METHOD FOR PURIFYING ADIPIC ACID BY CRYSTALLIZATION |
摘要 |
The invention discloses a method for purifying adipic acid by crystallization or recrystallization in at least one carbolyxic acid. More precisely, it discloses an improvement in adipic acid crystallization or recrystallization, characterised in that the said crystallization or recrystallization is effected in at least one carboxylic acid with a melting point below 20 C. The presence of carbon monoxide during crystallization or recrystallization can have a favourable effect on the adipic acid purity, in particular by reducing the content of metal catalyst traces of the adipic acid. The adipic acid purity can also be improved when the crystallization or recrystallization is effected in presence of a strong proton acid. Adipic acid is one of two basic raw materials for production of 6-6 polyamide.
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申请公布号 |
SK166398(A3) |
申请公布日期 |
1999.06.11 |
申请号 |
SK19980001663 |
申请日期 |
1997.05.29 |
申请人 |
RHODIA FIBER AND RESIN INTERMEDIATES |
发明人 |
HENRIET ERIC B.;LECONTE PHILIPPE;PATOIS CARL;PERRON ROBERT |
分类号 |
C07C51/43;C07C55/14;(IPC1-7):C07C55/14 |
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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