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,...
Patent
1985-06-26
1990-05-22
Stoll, Robert L.
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,...
423 53, 423 68, 423150, B01J 3866
Patent
active
049277944
ABSTRACT:
A process is disclosed to extract metal values selected from the group consisting of cobalt, molybdenum, nickel, tungsten, and vanadium from metal-containing particles, such as spent hydroprocessing catalyst particles containing carbon residue. In this process, the spent catalyst particles are roasted in an oxygen-containing gas at a temperature of from 400.degree. C. to 600.degree. C., and then the roasted catalyst particles are contacted with an aqueous solution of ammonia, ammonium salt, and hydrogen peroxide. That aqueous solution has an initial pH of at least 9.5 and an initial hydrogen peroxide concentration of from 0.02 to 0.2 M. That aqueous solution is maintained at a pH of greater than 9.5.
REFERENCES:
patent: 2204193 (1940-06-01), Spicer et al.
patent: 3653815 (1972-04-01), Skorbo
patent: 4080421 (1978-03-01), Kasserra
patent: 4382068 (1983-05-01), Rokukawa
Chevron Research Company
De Jonghe T. G.
McGarrigle, Jr. P. L.
Stoll Robert L.
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