Method for passivating cracking catalyst
A method is described for reducing the adverse catalytic effects of a metal contaminant selected from the group consisting of nickel, vanadium, iron and mixtures thereof present in a hydrocarbon feedstock processed in a cracking system comprising a reaction zone, a regeneration zone, and a catalyst transfer means communicating between the reaction zone and the regeneration zone. The method comprises: contacting the hydrocarbon feedstock containing the metal contaminant with cracking catalyst in the reaction zone under cracking conditions to produce cracked hydrocarbon product and coke. Coke and metal contaminant are deposited on the cracking catalyst; passing coke and metal contaminated catalyst from the reaction zone to the regeneration zone maintained under regeneration conditions to remove coke from the catalyst; passing the coke removed, metal contaminated catalyst through a passivation zone maintained under net reducing conditions at an elevated temperature. The passivation zone is disposed in a catalyst transfer means adapted to return regenerated catalyst to the reaction zone.
- Assignee:
- Exxon Research and Engineering Co., Florham Park, NJ
- Patent Number(s):
- US 4666584
- OSTI ID:
- 6533703
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
CADMIUM COMPOUNDS
CATALYSTS
CATALYTIC CRACKING
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COKE
CRACKING
DECOMPOSITION
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GERMANIUM COMPOUNDS
HYDROCARBONS
IMPURITIES
INDIUM COMPOUNDS
IRON COMPOUNDS
KINETICS
MIXTURES
NICKEL COMPOUNDS
ORGANIC COMPOUNDS
PASSIVATION
PETROLEUM
PYROLYSIS
REACTION KINETICS
REGENERATION
TELLURIUM COMPOUNDS
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
ZINC COMPOUNDS