Process and device for purifying benzoic acid

Details Process and device for purifying benzoic acid Process and device for purifying benzoic acid

1985-11-06

1987-03-24

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5142

Patent

active

046526757

ABSTRACT:
Process for purifying benzoic acid obtained by oxidation of toluene with a gas containing molecular oxygen, which purification is carried out at a pressure of at least 3 MPa by means of a supercritical extraction using a gas or gas mixture the critical temperature of which is lower than 435 K. The process being characterized in that the benzoic acid to be purified is supplied in a liquid state to a crystallizer in which the prevailing temperatures is below the solidification temperature of the benzoic acid and in which the benzoic acid is treated during and possibly after the crystallization process with the said gas or gas mixture.

REFERENCES:
patent: 2255421 (1941-09-01), Groll et al.
patent: 4227018 (1980-10-01), Wolf et al.
patent: 4539425 (1985-09-01), Kleintjens et al.
patent: 4547587 (1985-10-01), Kleintjens et al.

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