Separation of cobalt and manganese from trimellitic acid process

Details Separation of cobalt and manganese from trimellitic acid process Separation of cobalt and manganese from trimellitic acid process

1980-12-19

1981-11-03

Siegel, Alan

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

Organic compounds

Carboxylic acids and salts thereof

252415, 252420, 423 49, 423139, 423140, 423151, C07C 5142, B01J 3700, C01G 4500, C01G 4900

Patent

active

042987598

ABSTRACT:
A unique method of separating cobalt and manganese from residue obtained from the manufacture of trimellitic acid by the oxidation of pseudocumene in the presence of cobalt and manganese as metal oxidation catalysts and from each other without contributing to the problem of solids disposal. Said unique method comprises extracting the residues with water, removing cobalt and mangangese from the extract solution with a cation exchanger thereby producing a metal-free solution of trimellitic acid, regenerating the cation exchanger with a strong inorganic acid, adjusting the pH of the spent regenerating acid to pH of 3 to 4 if iron is present to precipitate it as its hydroxide but at least to pH of 6 while also adding powdered manganese to precipitate metallic cobalt.

REFERENCES:
patent: 3071614 (1963-01-01), Knobloch

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