Claims
- 1. A polymerization process comprising contacting at least one mono-1-olefin having 2 to 8 carbon atoms with a catalyst prepared by subjecting a silica-containing support at an elevated temperature to a treating ambient selected from (1) .[.carbon monoxide, (2).]. a halogen-containing component selected from bromine, iodine, HBr, HI, organic bromides, and organic iodides, which halogen-containing component also either contains air or is followed by air or .[.(3).]. .Iadd.(2) .Iaddend.a carbon, oxygen and sulfur-containing composition, thereafter incorporating a chromium compound under anhydrous conditions to thus form said catalyst and thereafter activating said catalyst in an oxygen ambient.
- 2. A polymerization process according to claim 1 wherein said olefin comprises ethylene.
- 3. A polymerization process according to claim 1 wherein said at least one mono-1-olefin is selected from ethylene, propylene, and 1-butene.
- 4. A polymerization process according to claim 1 wherein said polymerization conditions comprise a temperature of 66.degree.-110.degree. C.
- 5. A method according to claim 1 wherein after said incorporation of said chromium compound said catalyst is activated in an oxygen ambient at a temperature within the range of 15.degree.-870.degree. C. for a time of at least 5 minutes.
- 6. A method according to claim 1 wherein said silica is a coprecipitated silica-titania cogel.
- 7. A method according to claim 1 wherein said chromium is incorporated in an amount sufficient to give 0.1 to 5 weight percent chromium based on the weight of said support.
- 8. A method according to claim 1 wherein said support is a silica-titania cogel containing 0.5 to 5 weight percent titanium based on the weight of said cogel. .[.
- 9. A method according to claim 8 wherein said treating ambient is carbon monoxide..].
- 10. A method according to claim 8 wherein said treating ambient is bromine vapor.
- 11. A method according to claim 8 wherein said treating ambient is HBr.
- 12. A method according to claim 8 wherein said treating ambient is bromine+air.
- 13. A method according to claim 8 wherein said treating ambient is iodine vapor.
- 14. A method according to claim 8 wherein said treating ambient is HI.
- 15. A method according to claim 8 wherein said treating ambient is iodine+air.
- 16. A method according to claim 8 wherein said treating ambient is said halogen containing component of .[.(2).]. .Iadd.(1) .Iaddend.and wherein said halogen-containing component is bromine and wherein said ambient contains in addition carbon monoxide.
- 17. A method according to claim 8 wherein said treating ambient is said halogen-containing component of .[.(2).]. .Iadd.(1) .Iaddend.and wherein said halogen-containing component is iodine and wherein said ambient contains in addition carbon monoxide.
- 18. A method according to claim 8 wherein said treating ambient is carbonyl sulfide.
- 19. A method according to claim 8 wherein said elevated temperature is within the range of 759.degree.-925.degree. C.
- 20. A method according to claim 1 wherein said chromium compound is incorporated by means of an inert liquid hydrocarbon diluent or solvent.
- 21. A method according to claim 20 wherein said chromium compound is one of a .pi.-bonded organochromium compound, esters of chromic acid, and chromium acetylacetonate.
- 22. A method according to claim 1 wherein said support is preoxidized by being subjected to oxidation conditions after being subjected to said ambient and prior to incorporation of said chromium compound.
- 23. A method according to claim 22 wherein said support is a silica-titania cogel containing about 2 weight percent titanium, said elevated temperature is within the range of 750.degree.-925.degree. C., said chromium compound is selected from tertiary butyl chromate, and dicumene chromium carried in normal hexane, and wherein said preoxidation is carried out at a temperature within the range of 525.degree.-925.degree. C., and wherein after said incorporation of said chromium compound said catalyst is activated by heating in air at a temperature within the range of 315.degree.-760.degree. C. .Iadd. 24. A polymerization process comprising contacting at least one mono-1-olefin having 2 to 8 carbon atoms with a catalyst prepared by subjecting a silica-titania cogel support at an elevated temperature to a treating ambient comprising carbon monoxide, thereafter incorporating a chromium compound under anhydrous conditions to thus form said catalyst and thereafter activating said catalyst in an oxygen ambient. .Iaddend..Iadd. 25. A polymerization process comprising contacting at least one mono-1-olefin having 2 to 8 carbon atoms with a catalyst prepared by subjecting a silica-containing support at an elevated temperature to a treating ambient comprising carbon monoxide to produce a treated support, thereafter preoxidizing said treated support by subjecting said treated support to oxidation conditions, thereafter incorporating a chromium compound under anhydrous conditions to form said catalyst and thereafter activating said catalyst in an oxygen ambient. .Iaddend.
CROSS REFERENCE TO RELATED APPLICATION
This is a divisional of copending application Ser. No. 44,809, filed June 1, 1979, now U.S. Pat. No. 4,248,735, which in turn is a continuation-in-part of copending application Ser. No. 857,552, filed Dec. 5, 1977, now abandoned.
US Referenced Citations (19)
Foreign Referenced Citations (3)
Number |
Date |
Country |
863932 |
Feb 1971 |
CAX |
2278710 |
Feb 1976 |
FRX |
1415646 |
Nov 1975 |
GBX |
Non-Patent Literature Citations (2)
Entry |
J. Phys. Chem., 70, #9, pp. 2937-2945 (1966). |
CA, 83, 59929(b), (1975). |
Divisions (1)
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Number |
Date |
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Parent |
44809 |
Jun 1979 |
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Continuation in Parts (1)
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Number |
Date |
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857552 |
Dec 1977 |
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Reissues (1)
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Number |
Date |
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Parent |
173525 |
Jul 1980 |
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