Claims
- 1. A polymerization process comprising contacting at least one mono-1-olefin having 2 to 8 carbon atoms per molecule with a catalyst system produced by a method comprising:
- a) dissolving a fluorine-containing compound with a base;
- b) mixing a solution of (a) with a water-soluble aluminum compound to form a cogel;
- wherein said fluorine-containing compound is present in an amount sufficient to incorporate from about 6 to about 12 weight percent fluorine into the cogel, based on the weight of the cogel;
- c) washing the cogel of (b) in alcohol;
- d) drying and calcining the washed product to form AlF.sub.3 .multidot.X(Al.sub.2 O.sub.3) and
- e) incorporating a chromium compound into said AlF.sub.3 .multidot.X(Al.sub.2 O.sub.3).
- 2. A process according to claim 1 wherein said catalyst system is heated at a temperature within a range of about 300.degree. to about 700.degree. C., for a time within a range of about 1 to about 10 hours, in an oxidizing atmosphere.
- 3. A process according to claim 1 wherein said olefin is selected from the group consisting of ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, and mixtures thereof.
- 4. A process according to claim 3 wherein a copolymer is produced from ethylene and a comonomer selected from the group consisting of propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, and mixtures thereof.
- 5. A process according to claim 1 wherein said polymerization is carried out at a temperature within a range of about 66.degree. to about 110.degree. C. and a pressure within the range of about 110 to about 700 psia.
- 6. A process according to claim 1 wherein a cocatalyst is present during said polymerization.
- 7. A process according to claim 1 wherein a polymer is recovered.
- 8. A process according to claim 1 wherein the amount of said fluoriding agent is sufficient to incorporate from about 10 to about 50 weight percent AlF.sub.3 into the cogel, based on the weight of the AlF.sub.3 .multidot.X(Al.sub.2 O.sub.3).
- 9. A process according to claim 1 wherein said fluorine-containing compound is ammonium bifluoride (NH.sub.4 HF.sub.2).
- 10. A process according to claim 1 wherein said base is ammonium hydroxide.
- 11. A process according to claim 1 wherein said water-soluble aluminum compound is (Al(NO.sub.3).sub.3).
- 12. A process according to claim 1 wherein the chromium impregnated cogel comprises chromium within a range of about 0.1 to about 10 weight percent chromium, based on the weight of the dried fluorided alumina.
- 13. A polymerization process comprising contacting at least one mono-1-olefin having 2 to 8 carbon atoms per molecule with a catalyst system produced by:
- a) dissolving ammonium bifluoride (NH.sub.4 HF.sub.2) with ammonium hydroxide;
- b) mixing the ammonium bifluoride/ammonium hydroxide solution with aluminum nitrate to form a cogel;
- wherein said fluorine-containing compound is present in an amount sufficient to incorporate from about 6 to about 12 weight percent fluorine into the cogel, based on the weight of the cogel;
- c) washing the cogel of (b) in alcohol;
- d) drying and calcining the washed product to form AlF.sub.3 .multidot.X(Al.sub.2 O.sub.3); and
- e) incorporating a chromium compound into said cogel.
- 14. A process according to claim 13 further comprising the step of heating the chromium impregnated fluorided alumina at a temperature within a range of about 300.degree. to about 700.degree. C., for a time within a range of about 10 to about 10 hours, in an oxidizing atmosphere.
- 15. A process according to claim 13 wherein a copolymer is produced from ethylene and a comonomer selected from the group consisting of propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, and mixtures thereof.
- 16. A process according to claim 13 wherein a cocatalyst is present during said polymerization.
- 17. A process according to claim 13 wherein a polymer is recovered.
Parent Case Info
This application is a division of application Ser. No. 07/637,897, filed Jan. 2, 1991, U.S. Pat. No. 5,171,798 the entirety of which is herein incorporated by reference and now allowed.
US Referenced Citations (9)
Divisions (1)
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Number |
Date |
Country |
Parent |
637897 |
Jan 1991 |
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