Process of polymerizing olefins in the presence of a chromium-containing catalyst
AssigneePhillips Petroleum Company
InventorsWilliam K. Reagen, Brian K. Conroy
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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 to trimerize and/or polymerize olefins.
Claims18
A process comprising polymerizing olefins in the presence of a catalyst prepared by a process comprising forming a mixture of and refluxing:
- (a) a chromium source selected from the group consisting of a chromium salt having the formula CrXn, 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 metal amide selected from the group consisting of alkali metal amide salts alkaline earth metal amide salts, and mixtures thereof;
- and
- (c) an electron pair donor solvent which can affect a reaction between the chromium source and the metal amide.
A polymerization process comprising contacting at least one mono-1-olefin with a catalyst prepared by a process comprising forming a mixture of and refluxing:
- (a) a chromium source selected from the group consisting of a chromium salt having the formula CrXn, 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 metal amide selected from the group consisting of alkali metal amide salts, alkaline earth metal amide salts, and mixtures thereof;
- and
- (c) an electron pair donor solvent which can affect a reaction between the chromium source and the metal amide.
A polymerization process comprising contacting at least one mono-1-olefin with a catalyst prepared by a process comprising forming a mixture of and refluxing:
- (a) about one mole of chromous chloride;
- (b) about two moles of sodium pyrrole;
- and
- (c) tetrahydrofuran.
A polymerization process comprising contacting at least one mono-1-olefin with a catalyst prepared by a process comprising forming a mixture of and refluxing:
- (a) about one mole of chromous chloride;
- (b) an excess of sodium pyrrole;
- and
- (c) an excess of tetrahydrofuran.
A polymerization process comprising contacting at least one mono-1-olefin with a catalyst prepared by a process comprising forming a mixture of and refluxing:
- (a) about one mole of chromic chloride;
- (b) about three moles of sodium pyrrole;
- and
- (c) an excess of dimethoxyethane.
A polymerization process comprising contacting at least one mono-1-olefin with a catalyst prepared by a process comprising forming a mixture of and refluxing:
- (a) about one mole of chromous chloride;
- (b) an excess of 2,5-dimethylpyrrole;
- and
- (c) an excess of tetrahydrofuran.
Dependencies are inferred from the claim text.