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US 4,324,648 AGranted
Cracking catalyst poisons passivated with tin compounds plus both sulfur and phosphorus
AssigneePhillips Petroleum Company
InventorsJohn S. Roberts, Brent J. Bertus, Dwight L. McKay, H. Wayne Mark
Life of this patent
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Abstract
Deposits on a cracking catalyst are passivated by contacting the cracking catalyst with tin and at least one of phosphorus or sulfur.
Claims20
In a process comprising:
- (a) contacting a hydrocarbon feedstock with a fluidized zeolite-containing cracking catalyst in a cracking zone under cracking conditions in the absence of added hydrogen or antimony to obtain a cracked product;
- (b) recovering the cracked product;
- (c) passing the cracking catalyst from the cracking zone to a regeneration zone;
- (d) regenerating the cracking catalyst in the regeneration zone by contact with oxygen-containing gas under regeneration conditions to produce a regenerated catalyst;
- and
- (e) introducing the regenerated catalyst to the cracking zone for contact with the hydrocarbon feedstock;
- wherein the regenerated catalyst contains contaminants selected from the group consisting of nickel, vanadium and iron deposited on said cracking catalyst in such a way that said cracking catalyst cannot be fully regenerated in the regeneration zone, the improvement comprising contacting the cracking catalyst with a treating agent containing tin, phosphorus and sulfur in an amount sufficient to impart to said cracking catalyst a tin concentration of from about 0.0001 to about 4 percent by weight of contacted cracking catalyst wherein the cracking catalyst is contacted with from about one-half to about 8 parts by weight of sulfur and/or from about one quarter to about one part by weight of phosphorus for each part by weight of tin with which it has been contacted.
4 more elements
In a process comprising:
- (a) contacting a hydrocarbon feedstock with a fluidized zeolite-containing cracking catalyst in a cracking zone under cracking conditions in the absence of added hydrogen or antimony to obtain a cracked product;
- (b) recovering the cracked product;
- (c) passing the cracking catalyst from the cracking zone to a regeneration zone;
- (d) regenerating the cracking catalyst in the regeneration zone by contact with oxygen-containing gas under regeneration conditions to produce a regenerated catalyst;
- and
- (e) introducing the regenerated catalyst to the cracking zone for contact with the hydrocarbon feedstock;
- wherein the regenerated cracking catalyst contains contaminants selected from the group consisting of nickel, vanadium and iron deposited on said cracking catalyst in such a way that said cracking catalyst cannot be fully regenerated in the regeneration zone, the improvement comprising contacting the cracking catalyst with a treating agent represented by the formula:
- ##STR3## wherein each R can be the same or different and comprises a hydrocarbyl group having from 1 to about 24 carbon atoms, wherein X is selected from the group consisting of oxygen and sulfur and at least one X is sulfur, and wherein n is 2 or 4 so as to impart to the cracking catalyst a tin concentration of from about 0.0001 to about 4 percent by weight of contacted cracking catalyst.
5 more elements
Dependencies are inferred from the claim text.