Process for reducing coke formation in heavy feed catalytic cracking
A method for decreasing the amount of hydrogen and coke produced during the cracking of hydrocarbon feedstock to lower molecular weight products in a reaction zone is disclosed, where the feedstock contains at least one metal contaminant selected from the class consisting of nickel, vanadium and iron and where the contaminant becomes deposited on the catalyst such that at least 50 wt. % of the total of the metal contaminants comprises on one of the metal contaminants. The method comprises monitoring the composition of the metal contaminant on the catalyst, adding an effective passivating amount of at least one of the metal contaminants which is not the major contaminant on the catalyst and passing catalyst from the reaction zone through a regeneration zone operated under net reducing conditions and through a reduction zone maintained at an elevated temperature.
- Assignee:
- Exxon Research and Engineering Co
- Patent Number(s):
- US 4370220
- OSTI ID:
- 6350943
- Country of Publication:
- United States
- Language:
- English
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Process for reducing coke formation in heavy feed catalytic cracking
Process for reducing coke formation in heavy feed catalytic cracking
Related Subjects
020400* -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CATALYSTS
CATALYTIC CRACKING
CHEMICAL REACTIONS
COKE
CONTAMINATION
CRACKING
DECOMPOSITION
ELEMENTS
HYDROCARBONS
HYDROGEN
IRON
METALS
NICKEL
NONMETALS
ORGANIC COMPOUNDS
PASSIVATION
PRODUCTION
PYROLYSIS
SURFACE CONTAMINATION
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
VANADIUM