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US 4,514,368 AGranted
Leaching nickel, cobalt, molybdenum, tungsten, and vanadium from spent hydroprocessing catalysts
AssigneeChevron Research Company
InventorGale L. Hubred
Life of this patent
Estimating the term…
Abstract
A process for removing nickel, cobalt, molybdenum, and vanadium from spent hydroprocessing catalyst particles by roasting the catalyst at between 400.degree. C. and 600.degree. C. and leaching the catalyst particles with an aqueous solution of ammonia and an ammonium salt.
Claims4
A process to extract nickel, vanadium, cobalt and molybdenum from spent hydroprocessing catalyst particles containing carbon residue comprising:
- (a) roasting said catalyst particles in an atmosphere containing molecular oxygen at a temperature in the range of between about 400.degree. C. and 600.degree. C.;
- and
- (b) contacting said roasted catalyst particles with an aqueous solution of ammonia and a compound selected from the group consisting of ammonium carbonate and ammonium sulfate, said solution being maintained at a temperature in the range of 85.degree. C. to 95.degree. C., wherein said aqueous solution has a pH in the range of 9.5 to 11 and concentrations of ammonia plus ammonium do not exceed 6M, such that at least 85 percent of molybdenum, 70 percent of vanadium, 45 percent cobalt, and 70 percent nickel is recovered from said roasted catalyst particles.
Dependencies are inferred from the claim text.