Process for the production of terephalic acid

Details Process for the production of terephalic acid Process for the production of terephalic acid

1996-07-17

1997-10-21

Barts, Samuel

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5143

Patent

active

056798466

ABSTRACT:
A terephthalic acid slurry in acetic acid is produced by oxidizing p-xylene in acetic acid, removing water by evaporation of a stream of water and acetic acid, and returning acetic acid to the oxidation step. The terephthalic acid is separated from the reaction medium in a first zone to leave a deposit on a band, the deposit is washed with a first aqueous medium in a second zone, removed from the band in a third zone, and admixed with a second aqueous medium. Reaction medium is passed from the first zone to the oxidation step and terephthalic acid is recovered, preferably after further purification.

REFERENCES:
patent: 4038193 (1977-07-01), Oosten
patent: 4782181 (1988-11-01), James
patent: 4786753 (1988-11-01), Partenheimer et al.
patent: 4939297 (1990-07-01), Browder
patent: 5008450 (1991-04-01), Yamamoto
patent: 5093001 (1992-03-01), Ueda
patent: 5175355 (1992-12-01), Streich
patent: 5200557 (1993-04-01), Gee

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