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    • 28. 发明授权
    • Method for purifying adipic acid by crystallization
    • 通过结晶纯化己二酸的方法
    • US06538156B1
    • 2003-03-25
    • US09194925
    • 1998-12-04
    • Eric B. HenrietPhilippe LeconteCarl PatoisRobert Perron
    • Eric B. HenrietPhilippe LeconteCarl PatoisRobert Perron
    • C07C5143
    • C07C51/43C07C55/14
    • 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.
    • 本发明公开了一种通过在至少一种碳酸中结晶或重结晶来纯化己二酸的方法。 更准确地说,它公开了己二酸结晶或重结晶的改进,其特征在于所述结晶或重结晶在至少一种熔点低于20℃的羧酸中进行。结晶或重结晶过程中一氧化碳的存在可以具有 特别是通过降低己二酸的金属催化剂痕量的含量,对己二酸的纯度有利的效果。 当在强质子酸存在下进行结晶或重结晶时,己二酸的纯度也得到改善。