Process for crystallizing trimellitic acid

Details Process for crystallizing trimellitic acid Process for crystallizing trimellitic acid

1982-12-30

1984-12-25

Trousof, Natalie

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

Organic compounds

Carboxylic acids and salts thereof

562416, 562417, C07C 5143

Patent

active

044905548

ABSTRACT:
In crystallizing and separating trimellitic acid obtained by the oxidation of dimethylbenzaldehyde or its oxidation derivative with a molecular oxygen-containing gas in an aqueous solvent in the presence of a bromine ion or a bromine ion and a heavy metallic ion catalyst, a process for crystallizing trimellitic acid wherein the crystallization is carried out with at least two crystallization vessels connected in series, of which the first vessel is kept at a temperature of 40.degree. to 130.degree. C. and at a concentration of trimellitic acid of 20 to 60 wt. %.

REFERENCES:
patent: 3033899 (1957-12-01), Knobloch et al.
patent: 3708532 (1973-01-01), Ichikawa et al.
patent: 4346232 (1982-08-01), Komatsu et al.

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