A purification process of crude terephthalic acid in a post...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/487 (2006.01) C07C 63/26 (2006.01)

Patent

CA 2522440

The present invention relates to a process for heating a secondary oxidizer with steam. More specifically, the present invention relates to a process for heating a secondary oxidizer with steam in a process for the production of a crystallized product. A process to produce a crystallized product comprises the following steps (a) oxidizing in an primary oxidation zone an aromatic feedstock to produce a crude carboxylic acid slurry; (b) oxidizing said crude carboxylic acid slurry in a post oxidation zone in the presence of steam to form a post oxidation product; (c) purifying said post oxidation product to a decolorized post oxidation product; and (d) crystallizing in a crystallization zone said post oxidation product to form a crystallized product.

L'invention concerne un procédé de chauffage à la vapeur d'un oxydant secondaire. L'invention porte plus spécifiquement sur un procédé de chauffage à la vapeur d'un oxydant secondaire dans un procédé de production d'un produit cristallisé. Un procédé de production d'un produit cristallisé consiste à: (a) oxyder dans une zone d'oxydation primaire une charge aromatique pour produire une suspension épaisse d'acide carboxylique cru; (b) oxyder ladite suspension épaisse d'acide carboxylique dans une zone de post-oxydation en présence de vapeur pour former un produit de post-oxydation; (c) purifier ledit produit de post-oxydation pour produire un produit de post-oxydation décoloré; et (c) cristalliser dans une zone de cristallisation ledit produit de post-oxydation pour former un produit cristallisé.

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