Process for producing aromatic carboxylic acid

Details Process for producing aromatic carboxylic acid Process for producing aromatic carboxylic acid

1998-09-28

1999-09-28

Barts, Samuel

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C07C 5110

Patent

active

059591404

ABSTRACT:
There is disclosed a process for producing an aromatic carboxylic acid (e.g.iso-or-tere-phthalic acid) by liquid-phase oxidation of an alkyl-group-substituted aromatic compound (e.g. p-or-m-xylene) in acetic acid which comprises dehydrating water-containing acetic acid by azeotropic distillation in an azeotropic distillation dehydration tower to recycle the dehydrated acetic acid as the solvent, and suppressing the concentration of the alkyl-group-substituted aromatic compound in the entrainer (e.g. n-butyl acetate) which is fed at the top portion of the above tower, to at most 10% by weight by removing the above aromatic compound. The process makes it possible to proceed with efficient dehydration of water-containing acetic acid for a long period of time by preventing the separation efficiency between acetic acid and an azeotropic component from being deteriorated by the alkyl-group-substituted aromatic compound remaining in the azeotropic component.

REFERENCES:
patent: 2175879 (1939-10-01), Coutour
patent: 4204915 (1980-05-01), Kurata et al.
Chem Abstracts 1979:491377, Duelsen et al.

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