Method of regenerating a catalyst

Details Method of regenerating a catalyst Method of regenerating a catalyst

2005-11-10

2010-10-12

Johnson, Edward M (Department: 1793)

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,...

C502S028000, C502S514000

Reexamination Certificate

active

07811955

ABSTRACT:
Platinum is applied on a carrier such as graphite to form a platinum catalyst. The catalyst becomes poisoned with a metal as a result of use of the catalyst in preparation of hydroxylammonium salts. A method of regenerating the catalyst dissolves the platinum and the metal in an acid. The method also adds ammonium sulfate to the acid to precipitate the platinum. The ammonium sulfate is a by-product of a commercial process to synthesize a caprolactam. Also, the method precipitates the platinum onto the carrier for reuse in the preparation of the hydroxylammonium salts and in preparation of the caprolactam.

REFERENCES:
patent: 2787540 (1957-04-01), Appell
patent: 3060133 (1962-10-01), Jockers et al.
patent: 3966635 (1976-06-01), El-Ghatta et al.
patent: 4659683 (1987-04-01), Biffar et al.
patent: 1197619 (1970-07-01), None

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