Process for the purification of benzoic acid by distillation wit

Details Process for the purification of benzoic acid by distillation wit Process for the purification of benzoic acid by distillation wit

1989-08-17

1991-08-06

Bascomb, Wilbur

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 51, 203 56, 203 59, 203 63, 203 71, 203 73, 203 77, 562494, 562863, B01D 334, C07C 5144, C07C 6306

Patent

active

050375121

ABSTRACT:
A process for the purification of crude benzoic acid obtained by the catalytic oxidation of toluene in the liquid phase, which is contaminated with impurities including phthalic acid and benzylbenzoate, the process involves distilling the crude benzoic acid in a first distillation in the presence of an aliphatic amine or a mixture of aliphatic amines of the formula

REFERENCES:
patent: 2283991 (1942-05-01), Hill
patent: 2568095 (1951-09-01), Smith et al.
patent: 2865959 (1958-12-01), Toland
patent: 3078303 (1963-02-01), Sweeney
patent: 3115521 (1963-12-01), Swakon
patent: 3159673 (1964-12-01), Weil
patent: 4092353 (1978-05-01), Wolf
patent: 4430181 (1984-02-01), Neumann et al.

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