Olefin production
AssigneePhillips Petroleum Company
InventorsRonald D. Knudsen, Jeffrey W. Freeman, Mark E. Lashier
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Abstract
A process is provided to stabilize and/or reactivate an olefin production catalyst system which comprises contacting an olefin production catalyst system, either before or after use, with an aromatic compound.
Claims20
A process to trimerize olefins comprising contacting in a reaction zone one or more olefins with a catalyst system comprising a chromium compound, a pyrrole-containing compound and a metal alkyl,
- wherein said three catalyst system components have been reacted in the presence of an unsaturated hydrocarbon;
- and
- wherein said catalyst system has been stabilized by contacting said catalyst system with a mononuclear aromatic compound selected from the group consisting of toluene, benzene, xylene, mesitylene, hexamethylbenzene, and mixtures of two or more thereof under conditions sufficient to improve the catalyst system thermal stability or activity.
A process to trimerize ethylene to 1-hexene comprising contacting in a reaction zone ethylene with a catalyst system composition comprising a chromium source, a pyrrole-containing compound and a metal alkyl,
- wherein said three catalyst system components have been reacted in the presence of an unsaturated hydrocarbon;
- and
- wherein said catalyst system has been stabilized by contacting said catalyst system with mononuclear aromatic compound selected from the group consisting of toluene, benzene, xylene, mesitylene, hexamethylbenzene, and mixtures of two or more thereof under conditions sufficient to improve the catalyst system thermal stability or activity.
Dependencies are inferred from the claim text.