Method for purifying adipic acid by crystallization

C - Chemistry – Metallurgy – 07 – C

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C07C 55/14 (2006.01) C07C 51/43 (2006.01)

Patent

CA 2257348

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.

La présente invention concerne un procédé de purification de l'acide adipique par cristallisation ou recristallisation dans au moins un acide carboxylique. Plus précisément elle concerne un perfectionnement à la cristallisation ou à la recristallisation de l'acide adipique, caractérisé en ce que ladite cristallisation ou recristallisation est effectuée dans au moins un acide carboxylique ayant un point de fusion inférieur à 20 ~C. La présence de monoxyde de carbone pendant la cristallisation ou la recristallisation peut avoir un effet avantageux sur la pureté de l'acide adipique, en particulier pour réduire la teneur de l'acide adipique en traces de catalyseur métallique. La pureté de l'acide adipique peut aussi être améliorée lorsque la cristallisation ou la recristallisation est effectuée en présence d'un acide protonique fort.

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