Title:
【発明の名称】結晶化によりアジピン酸を精製する方法
Document Type and Number:
Japanese Patent JP3263401
Kind Code:
B2
Abstract:
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.
Inventors:
Henriette, Eric Bae.
Lecomte, Philip
Karl, Patwais
Robert, Peron
Lecomte, Philip
Karl, Patwais
Robert, Peron
Application Number:
JP50026298A
Publication Date:
March 04, 2002
Filing Date:
May 29, 1997
Export Citation:
Assignee:
Rhodia Fiber and Resin Intermeet
International Classes:
C07C51/43; C07C55/14; (IPC1-7): C07C51/43; C07C55/14
Domestic Patent References:
| JP49812B1 | ||||
| JP388711B1 |
Other References:
【文献】仏国特許発明901841(FR,B1)
【文献】仏国特許発明1349134(FR,B1)
【文献】仏国特許発明1349134(FR,B1)
Attorney, Agent or Firm:
Motohiro Kurauchi (1 outside)