Process for the preparation of pharmaceutical benzoic acid

Details Process for the preparation of pharmaceutical benzoic acid Process for the preparation of pharmaceutical benzoic acid

1983-12-22

1985-10-15

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

562412, 562415, C07C 5142

Patent

active

045475873

ABSTRACT:
Pharmaceutical benzoic acid is prepared from raw benzoic acid made of oxidation of toluene with an oxygen containing gas, the process is characterized in that the oxidation reaction product is contacted with at least 1 m.sup.3 per kg of benzoic acid of a gas with a critical temperature lower than 435 K by passing this gas through the oxidation reaction product at a flow rate of at least 1 m.sup.3 per hour per kg of benzoic acid at a temperature of 340-600 K. and a pressure of at least 3 MPa. The pharmaceutical benzoic acid is separated from the mixture by cooling it to 315-370 K. at a pressure of 3-300 MPa.

REFERENCES:
patent: 1380277 (1921-05-01), Weiss et al.
patent: 1686913 (1927-10-01), Jaeger
patent: 1851361 (1932-03-01), Jaeger et al.

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