Claims
- 1. A process for processing a hydrocarbon feed to increase the aromatics content thereof in a reaction zone which may be subjected to periodic exposure to more than 100 ppb sulfur, which comprises contacting the feed under catalytic reforming conditions with a catalyst comprising:
- (a) a noble metal;
- (b) an intermediate pore size crystalline silicate having a silica to alumina mole ratio of about 200 or greater; and
- (c) an alkali content of less than 6000 ppm in the crystalline silicate; and
- (d) an alkali to aluminum ratio in the crystalline silicate between 1 and 5 on a molar basis.
- 2. A process in accordance with claim 1 wherein the silica to alumina mole ratio of the silicate is at least 500.
- 3. A process in accordance with claim 1 wherein the silica to alumina mole ratio of the silicate is at least 1000.
- 4. A process in accordance with claim 3 wherein the alkali content is less than 5000 ppm.
- 5. A process in accordance with claim 1 wherein the catalyst is subject to at least periodic exposure in the reforming zone to more than 500 ppb sulfur.
- 6. A process in accordance with claim 1 wherein the catalyst is subject to at least periodic exposure in the reforming zone to more than 1000 ppb sulfur.
- 7. A process in accordance with claim 1 wherein the feed hydrocarbon contains more than 100 ppb sulfur.
- 8. A process in accordance with claim 1 wherein the feed hydrocarbon contains more than 500 ppb sulfur.
- 9. A process in accordance with claim 1 wherein the feed hydrocarbon contains more than 1000 ppb sulfur.
- 10. A process in accordance with claim 1 wherein the catalyst is presulfided.
- 11. A process in accordance with claim 3 wherein the catalyst is presulfided.
- 12. A process in accordance with claim 4 wherein the catalyst is presulfided.
- 13. A process in accordance with claim 1 wherein the silicate crystallite sizes are less than 5 microns.
- 14. A process in accordance with claim 2 wherein the silicate crystallite sizes are less than 2 microns.
- 15. A process in accordance with claim 14 wherein the catalyst is presulfided or sulfided.
- 16. A process in accordance with claim 1 wherein the feed hydrocarbon contains no more than 2 ppm sulfur.
- 17. A process in accordance with claim 7 wherein the feed hydrocarbon contains no more than 2 ppm sulfur.
- 18. A process in accordance with claim 1 wherein the feed hydrocarbon contains between 0.01 and 2 ppm sulfur.
- 19. A process in accordance with claim 7 wherein the feed hydrocarbon contains between 0.1 and 2 ppm sulfur.
- 20. A process in accordance with claim 1 wherein the crystalline silicate is ZSM-5.
- 21. A process in accordance with claim 1 wherein the crystalline silicate is ZSM-22.
- 22. A process in accordance with claim 1 wherein the noble metal is platinum, palladium, iridium or rhodium.
- 23. A process in accordance with claim 1 wherein the noble metal is platinum.
- 24. A process in accordance with claim 1 wherein the feed is a reformate.
- 25. A process in accordance with claim 1 wherein the feed is a paraffinic rich raffinate.
- 26. A process in accordance with claim 1 wherein the feed comprises hexane which is dehydrocyclizied to benzene.
- 27. A staged catalyst reforming process, comprising:
- (a) contacting a hydrocarbon feed in a penultimate reforming zone under catalytic reforming conditions including a reforming pressure in a range from about 0 to about 300 psig with a first catalyst comprising a Group VIII metal dispersed on an inorganic oxide support; and
- (b) contacting the effluent from said penultimate reforming zone in a final reforming zone under catalytic reforming conditions and at substantially the same pressure as is maintained in said penultimate reforming zone with a second catalyst comprising:
- (1) a noble metal;
- (2) an intermediate pore size crystalline silicate having a silica to alumina mole ratio of about 200 or greater; and
- (3) an alkali content of less than 6000 ppm in the crystalline silicate.
- 28. A staged reforming process, comprising:
- (a) contacting a hydrocarbon feed with a conventional reforming catalyst in a first reforming zone under reforming conditions to produce a reformate;
- (b) separating hydrogen along with any hydrogen sulfide present from the reformate to provide a hydrogen containing fraction and a substantially hydrogen-free and substantially hydrogen sulfide-free reformate fraction; and
- (c) contacting the reformate fraction with a second catalyst comprising:
- (1) a noble metal;
- (2) an intermediate pore size crystalline silicate having a silica to alumina mole ratio of about 200 or greater; and
- (3) an alkali content of less than 6000 ppm in the crystalline silicate.
- 29. A staged catalyst reforming process, comprising:
- (a) contacting a hydrocarbon feed in a penultimate reforming zone under catalytic reforming conditions including a reforming pressure in a range from about 0 to about 300 psig with a first catalyst comprising a Group VIII metal dispersed on an inorganic oxide support; and
- (b) contacting the effluent from said penultimate reforming zone in a final reforming zone under catalytic reforming conditions and at substantially the same pressure as is maintained in said penultimate reforming zone with a second catalyst comprising:
- (1) a noble metal;
- (2) an intermediate pore size crystalline silicate having a silica to alumina mole ratio of about 200 or greater; and
- (3) an alkali content of less than 6000 ppm in the crystalline silicate.
Parent Case Info
This application is a divisional of Ser. No. 07/488,332, filed Mar. 2, 1990 now U.S. Pat. No. 5,169,813.
US Referenced Citations (8)
Divisions (1)
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Number |
Date |
Country |
Parent |
488332 |
Mar 1990 |
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