Claims
- 1. A process comprising
- (a) contacting a zeolite-containing cracking catalyst with an aluminum-containing treating agent so as to deposit thereon a passivating amount of aluminum, said aluminum-containing treating agent being represented by the formula ##STR3## where R is a hydrocarbyl containing from 1 to about 20 carbon atoms and X is selected from the group consisting of oxygen and sulfur and at least one X is sulfur; and
- (b) contactng a hydrocarbon feedstock with the contacted cracking catalyst under cracking conditions.
- 2. A process as in claim 1 wherein the cracking catalyst contains from about 1 to about 60 percent by weight of a zeolitic component.
- 3. A process as in claim 2 wherein the cracking catalyst has deposited thereon in excess of 3000 vanadium equivalents of contaminants.
- 4. A process as in claim 3 wherein the cracking catalyst has deposited thereon between 10,000 and 50,000 vanadium equivalents of contaminants.
- 5. A process as in claim 4 wherein the cracking catalyst has deposited thereon between 20,000 and 50,000 vanadium equivalents of contaminants.
- 6. A process as in claim 1 further characterized in that said aluminum-containing treating agent is represented by the formula ((RO.sub.2)PS.sub.2).sub.3 Al, wherein R is a hydrocarbyl group having from 1 to about 20 carbon atoms.
- 7. A process as in claim 6 further characterized in that R equals n-propyl.
- 8. A cracking process utilizing a cyclic flow of catalyst between a fluidized cracking zone and a regeneration zone, said catalyst comprising a zeolite, wherein a hydrocarbon feedstock having an aluminum-containing treating agent incorporated therein is introduced into the fluidized cracking zone, said aluminum-containing treating agent being represented by the formula ##STR4## where R is a hydrocarbyl containing from 1 to about 20 carbon atoms and X is selected from the group consisting of oxygen and sulfur and at least one X is sulfur.
- 9. A process as in claim 8 further characterized in that the aluminum-containing treating agent is represented by the formula ((RO).sub.2 PS.sub.2).sub.3 Al, wherein R is a hydrocarbyl group having from 1 to about 20 carbon atoms.
- 10. A process as in claim 9 wherein the hydrocarbon feedstock is characterized by a total metals contaminant in the range of 40-100 ppm and an aluminum concentration in the range of 1-100 ppm.
- 11. A process as in claim 9 wherein the hydrocarbon feedstock is characterized by a total metals contaminant in the range of 100-200 ppm and an aluminum concentration in the range of 10-250 ppm.
- 12. A process as in claim 9 wherein the hydrocarbon feedstock is characterized by a total metals contaminant in the range of 200-300 ppm and an aluminum concentration in the range of 25-500 ppm.
- 13. A process as in claim 9 wherein the hydrocarbon feedstock is characterized by a total metals contaminant in the range of 300-800 ppm and an aluminum concentration in the range of 50-1000 ppm.
- 14. A process as in claim 9 further characterized in that R equals n-propyl.
Parent Case Info
This application is a division of Ser. No. 427,256, filed Sept. 29, 1982, now allowed, U.S. Pat. No. 4,584,283, a continuation of Ser. No. 175,622, filed Aug. 5, 1980, now abandoned.
US Referenced Citations (38)
Foreign Referenced Citations (1)
Number |
Date |
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729167 |
Mar 1966 |
CAX |
Divisions (1)
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Number |
Date |
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Parent |
427256 |
Sep 1982 |
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Continuations (1)
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Number |
Date |
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Parent |
175622 |
Aug 1980 |
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