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US 5,399,539 AGranted
Polymerization catalysts and processes
AssigneePhillips Petroleum Company
InventorsWilliam K. Reagen, Ted M. Pettijohn
Life of this patent
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Abstract
Supported olefin polymerization catalyst systems can be produced using waste chromium compounds. Olefin polymers can be prepared using a catalyst system composition comprising a waste chromium compound and an alkyl aluminum compound, both supported on an inorganic oxide support, wherein at least a portion of the waste chromium compound is in a hexavalent state.
Claims19
A process to prepare a catalyst system composition comprising:
- a) contacting a waste chromium compound, which has been previously used for another purpose and subsequently recovered, wherein said waste chromium compound comprises a chromium-containing compound, a pyrrole-containing compound, an unsaturated hydrocarbon;
- and a non-hydrolyzed aluminum alkyl;
- and a support selected from the group consisting of zeolites, inorganic oxides, and mixtures thereof;
- b) recovering a solid product;
- c) activating said solid product in the presence of oxygen at a temperature within a range of about 400.degree. to about 900.degree. C.;
- and
- d) recovering a solid catalyst system.
4 more elements
A process to prepare a catalyst system composition comprising:
- a) contacting a waste chromium compound, which has been previously used for another purpose and subsequently recovered, wherein the waste chromium compound is a chromium pyrrolide comprising 2,5-dimethylpyrrole;
- toluene;
- and non-hydrolyzed triethylaluminum;
- and an aluminophosphate support;
- b) recovering a solid product;
- c) activating said solid product in the presence of oxygen at a temperature within a range of about 400.degree. C. to about 900.degree. C.;
- and
- d) recovering a solid catalyst system.
5 more elements
Dependencies are inferred from the claim text.