Process for the purification of a crude carboxylic acid slurry

Details Process for the purification of a crude carboxylic acid slurry Process for the purification of a crude carboxylic acid slurry

C - Chemistry, Metallurgy

07

C

C07C 51/47 (2006.01) C07C 51/265 (2006.01) C07C 51/43 (2006.01) C07C 51/487 (2006.01) C07C 63/26 (2006.01)

Patent

CA 2505976

Disclosed is a process to produce a purified carboxylic acid product. The process comprises removing impurities from a crude carboxylic acid slurry in a solid-liquid displacement zone to form a slurry product. The slurry product if further treated in a staged oxidation zone and a crystallization zone to from a crystallized product. The crystallized product is further cooled in a cooling zone and subsequently filtered and dried in a filtration and drying zone. The process produces purified carboxylic acid product having good color and low impurity levels without the use of purification steps like hydrogenation.

L'invention concerne un procédé de production d'un produit d'acide carboxylique purifié. Ce procédé consiste à décharger les impuretés d'une boue d'acide carboxylique brute dans une zone de déplacement solide-liquide afin de former une boue. Cette boue est ensuite traitée dans une zone d'oxydation étagée et une zone de cristallisation afin de former un produit cristallisé. Ce produit cristallisé est ensuite refroidi dans une zone de refroidissement, puis filtré et séché dans une zone de filtrage et de séchage. Le procédé produit un acide carboxylique purifié de couleur agréable et à niveaux d'impuretés faibles sans utiliser d'étape de purification telle que l'hydrogénation.

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