Patent ID: 7384886
Filing Date: 2008-06-10
Classification: B01J,C07C

Abstract:
1. A method of making a catalyst for use in oligomerizing an olefin comprising a chromium-containing compound, a pyrrole-containing compound, a metal alkyl, a halide-containing compound, and optionally a solvent, the method comprising forming a pyrrole-chromium mixture by contacting the composition comprising the pyrrole-containing compound with the composition comprising the chromium-containing compound; and then contacting the pyrrole-chromium mixture with a composition comprising the metal alkyl wherein the pyrrole-chromium mixture is added to the composition comprising the metal alkyl, and wherein the composition comprising the pyrrole-containing compound and the composition comprising the chromium-containing compound are contacted at a variable pyrrole:Cr molar ratio to form the pyrrole-chromium mixture.