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U.S. Department of Energy
Office of Scientific and Technical Information

Heavy oil hydroprocess including recovery of molybdenum catalyst

Patent ·
OSTI ID:6439673

This patent describes a method for the recovery of spent catalyst from a hydroprocess for treating vanadium-containing hydrocarbon oil, the spent catalyst comprising molybdenum sulfide which is contaminated with vanadium sulfide accumulated from the hydrocarbon oil, the method comprising passing the vanadium contaminated molybdenum sulfide catalyst through an oxidizing zone to convert the molybdenum sulfide and the vanadium sulfide to oxides, passing the oxides and aqueous ammonia to a dissolving zone to preferentially dissolve molybdenum from vanadium, removing undissolved vanadium from the dissolving zone, and removing an aqueous stream comprising dissolved molybdenum and ammonia from the dissolving zone, wherein the mole ratio of ammonia to total metals in the spent catalyst in the dissolving zone is at least 2.5.

Assignee:
Chevron Research Co., San Francisco, CA
Patent Number(s):
US 4762812
OSTI ID:
6439673
Country of Publication:
United States
Language:
English