Recovery of oxidation catalysts used for the production of trime

Details Recovery of oxidation catalysts used for the production of trime Recovery of oxidation catalysts used for the production of trime

1996-01-03

1998-11-24

Lewis, Michael

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Treating with a liquid or treating in a liquid phase,...

502 24, 502 28, 562414, B01J 7034

Patent

active

058406433

ABSTRACT:
A method for separating oxidation catalysts used for producing trimellitic acid, which comprises the steps of: adding water to a reactor effluent in a volume ratio of water to the reactor effluent of 0:1 to 11:1, the reactor effluent being in a slurry state and resulting from oxidizing pseudocumene with air in an acetic acid and in the presence of cobalt, manganese and bromine catalysts; heating the mixture of water and the reactor effluent to a temperature of 25.degree. to 140.degree. C. to make the slurry be a diluted reactor effluent in a liquid phase; passing the diluted reactor effluent through ion exchange resins, to adsorb cobalt, manganese and bromine ions on the resins; regenerating the resins with an eluting solution; and isolating the oxidation catalysts from an effluent, shows recoveries of at least 99 wt % for cobalt, at least 99 wt % for manganese and at least 90 wt % for bromine.

REFERENCES:
patent: 4680098 (1987-07-01), Chang

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