Process for the production of terephthalic acid

Details Process for the production of terephthalic acid Process for the production of terephthalic acid

C - Chemistry, Metallurgy

07

C

C07C 51/265 (2006.01) C07C 51/42 (2006.01) C07C 51/43 (2006.01) C07C 63/26 (2006.01)

Patent

CA 2062063

A terephthalic acid slurry in acetic acid is produced by oxidising 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.

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