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 DEG 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.
申请公布号
WO9746510(A1)
申请公布日期
1997.12.11
申请号
WO1997FR00939
申请日期
1997.05.29
申请人
RHONE-POULENC FIBER AND RESIN INTERMEDIATES;HENRIET, ERIC, B.;LECONTE, PHILIPPE;PATOIS, CARL;PERRON, ROBERT
发明人
HENRIET, ERIC, B.;LECONTE, PHILIPPE;PATOIS, CARL;PERRON, ROBERT