Heavy oil hydroprocess including recovery of molybdenum catalyst
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
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Related Subjects
020400* -- Petroleum-- Processing
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
AMMONIA
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
DISSOLUTION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDRIDES
HYDROCRACKING
HYDROGEN COMPOUNDS
MANAGEMENT
MATERIALS RECOVERY
METALS
MOLYBDENUM
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM FRACTIONS
PROCESSING
PYROLYSIS
RECOVERY
REFRACTORY METAL COMPOUNDS
SOLUTES
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM COMPOUNDS
VANADIUM OXIDES
VANADIUM SULFIDES
VISCOSITY
WASTE MANAGEMENT
WASTE PROCESSING