Method of preparing pure benzoic acid

Details Method of preparing pure benzoic acid Method of preparing pure benzoic acid

1984-03-09

1986-03-25

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

562493, 562412, 562413, 562414, C07C 5142

Patent

active

045785112

ABSTRACT:
The invention is concerned with a method of purifying benzoic acid, as obtained by catalytic oxidation of toluene and purification by rectification with the secondary streams being cycled back into the oxidation reactor, characterized in that the secondary streams flowing out of the stripping column undergo the following sequential steps: (a) at least one distillation and at least one crystallization in an organic solvent; (b) scrubbing of the crystals obtained from (a) with the same solvent as in (a); (c) cycling of the mother liquors from crystallization in (a) plus the scrubbing liquors as in (b) back into the dissolver; (d) further scrubbing of the crystals from (b) with the same solvent as in (a) and cycling back of the scrubbing liquors, the crystals scrubbed as in (d) being optionally (d1) further scrubbed with water.

REFERENCES:
patent: 3235588 (1966-02-01), Weaver
patent: 3660478 (1972-05-01), Nasser
patent: 3931305 (1976-01-01), Fisher

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