Method for suppressing the poisoning effects of contaminant metals on cracking catalysts in fluid catalytic cracking
AssigneeChevron Research Company
InventorsPeriaswamy Ramamoorthy, Ashok S. Krishna
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Abstract
Poisoning of a cracking catalyst by contaminant metals such as nickel, vanadium and iron during fluid catalytic cracking of hydrocarbon charge stock containing the contaminant metals is suppressed by depositing minor amounts of a bismuth-containing passivating agent on the catalyst, desirably, a weight ratio of bismuth to nickel equivalents (nickel+0.2 vanadium+0.1 iron) of about 0.01:1 to about 1:1. The passivating agent can also comprise mixtures of compounds of bismuth and antimony, bismuth and tin.
Claims28
In a process for the conversion of hydrocarbon oil feed which comprises contacting a hydrocarbon feed containing metal contaminants including nickel, vanadium and iron with a cracking catalyst in a fluid catalytic cracking system, the improvement comprising:
- (a) analyzing the hydrocarbon feed for nickel equivalents (defined as [nickel+0.2 vanadium+0.1 iron]) and determining the quantity of nickel equivalents in said hydrocarbon feed, and
- (b) introducing a composition for mitigating or suppressing the contaminants-caused poisoning of the catalyst into said catalytic cracking system, said composition selected from the group consisting of bismuth, bismuth compounds and mixtures thereof, in a weight ratio of introduced bismuth composition to nickel equivalents of between about 0.01:1 and about 1:1.
ln a process for the conversion of hydrocarbon oil feed which comprises contacting a hydrocarbon feed containing metal contaminants including nickel, vanadium and iron with a cracking catalyst in a fluid catalytic cracking system, the improvement comprising:
- (a) analyzing the cracking catalyst for a nickel equivalent (defined as [nickel+0.2 vanadium+0.1 iron]) and determining the quantity of nickel equivalents on said catalyst, and
- (b) introducing a composition for mitigating or suppressing the contaminants causing poisoning of the caalyst into said catalytic cracking system, said composition selected from the group consisting of bismuth, bismuth compounds and mixtures thereof, in a weight ratio of introduced bismuth composition to nickel equivalents of between about 0.01:1 and about 1:1.
Dependencies are inferred from the claim text.