Chromium catalysts and process for making chromium catalysts
AssigneePhillips Petroleum Company
InventorsWilliam K. Reagen, Ted M. Pettijohn, Jeffrey W. Freeman
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Abstract
Novel chromium-containing compounds, such as, for example, chromium pyrrolides, are prepared by forming a mixture of a chromium salt, a metal amide, and an electron pair donor solvent, such as, for example, an ether. These novel chromium-containing, or chromium pyrrolide, compounds can be used either unsupported or supported on an inorganic oxide support, with a metal alkyl and an unsaturated hydrocarbon, to trimerize, oligomerize, and/or polymerize olefins.
Claims30
A composition comprising:
- p1 (a) a chromium source selected from the group consisting of a chromium salt having the formula CrX.sub.x, wherein X can be the same or different and is an organic or inorganic radical and n is an integer from 1 to 6, and chromium metal;
- (b) a pyrrole-containing compound;
- (c) a non-hydrolyzed aluminum alkyl;
- and
- (d) an unsaturated hydrocarbon.
A composition according to 4 wherein said trialkyl aluminum compound is triethyl aluminum.
A process to prepare a catalyst system comprising combining a chromium source selected from the group consisting of a chromium salt having the formula CrX.sub.n, wherein X can be the same or different and is an organic or inorganic radical and n is an integer from 1 to 6, and chromium metal a pyrrole-containing compound;
- a non-hydrolyzed aluminum alkyl;
- and an unsaturated hydrocarbon, under time, temperature, and pressure sufficient to form a catalyst system.
Dependencies are inferred from the claim text.