Terephthalic acid recovery by continuous flash crystallization

Details Terephthalic acid recovery by continuous flash crystallization Terephthalic acid recovery by continuous flash crystallization

1973-08-20

1976-01-06

Weinberger, Lorraine A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260515P, C07C 5146, C07C 5144, C07C 6326

Patent

active

039313050

ABSTRACT:
Inordinately slow crystallization at rate controlled evaporative cooling of terephthalic acid from liquid phase aqueous solutions also containing from 500 to 6,000 ppm p-toluic acid based on dissolved terephthalic acid at temperatures in the range of 400.degree. to 550.degree.F. can be overcome by more rapid continuous flash evaporation of solvent in two or more stirred crystallization zones to obtain a terephthalic acid product having 150 ppm or less p-toluic acid. Such product is readily separated from mother liquor by continuous centrifuge.

REFERENCES:
patent: 3639465 (1972-02-01), Olsen et al.
patent: 3708532 (1973-01-01), Ichikawa

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