Process for the production and the recovery of terephthalic acid

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

1980-09-11

1982-11-02

Siegel, Alan

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

Organic compounds

Carboxylic acids and salts thereof

562412, 562486, C07C 5116, C07C 5142

Patent

active

043574750

ABSTRACT:
The reaction mixture obtained by oxidizing p-xylene in the presence of water as diluent, at a temperature comprised between 140.degree. and 220.degree. C., and consisting of terephthalic acid crystals in suspension in an aqueous solution comprising unreacted p-xylene, intermediate oxidation products thereof, the heavy-metal catalyst and water is introduced in the upper part of a sedimentation column wherein the acid is separated by gravity and is washed with a counter current of water introduced near the bottom of said column, the temperature of the washing zone being higher than the minimum value T.sub.w given by the equation T.sub.w =144+0.225 T.sub.R, wherein T.sub.R is the oxidation temperature.

REFERENCES:
patent: 3637829 (1972-01-01), Kerr
patent: 3850983 (1974-11-01), Park
patent: 3865870 (1975-02-01), Cronauer et al.
patent: 4268690 (1981-05-01), Komatsu et al.

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