Method for purifying adipic acid by crystallization
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United States of America Patent
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Mar 25, 2003
Grant Date -
N/A
app pub date -
Dec 4, 1998
filing date -
Jun 4, 1996
priority date (Note) -
Expired
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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.degree. 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.
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