Abstract: The present invention relates to catalyst systems, processes for making such catalysts, intermediates for such catalysts, and olefin polymerization processes using such catalysts wherein such catalyst includes a component represented by the following formula IA:
wherein
R and R′ independently represent a hydrogen atom, or a substituted or unsubstituted, branched or unbranched hydrocarbyl or organosilyl radical;
R1, R2, and R3 independently represent a hydrogen atom, or a substituted or unsubstituted, branched or unbranched hydrocarbyl radical;
M is a group IIIB, IVB, VB, VIB, VIIB or VIII transition metal;
T independently represents a univalent anionic ligand such as a hydrogen atom, or a substituted or unsubstituted hydrocarbyl, halogeno, aryloxido, arylorganosilyl, alkylorganosilyl, amido, arylamido, phosphido, or arylphosphido group, or two T groups taken together represent an alkylidene or a cyclometallated hydrocarbyl bidentate ligand;
L independently represents a sigma donor
Type:
Grant
Filed:
December 16, 2002
Date of Patent:
November 23, 2004
Assignee:
Chevron Chemical Co.
Inventors:
Klaus H. Theopold, Woo-Kyu Kim, Leonard A. MacAdams, John M. Power, Javier M. Mora, Albert P. Masino
Abstract: The present invention relates to catalyst systems, processes for making such catalysts, intermediates for such catalysts, and olefin polymerization processes using such catalysts wherein such catalyst includes a component represented by the following formula 1A:
wherein
R and R′ independently represent a hydrogen atom, or a substituted or unsubstituted, branched or unbranched hydrocarbyl or organosilyl radical;
R1, R2, and R3 independently represent a hydrogen atom, or a substituted or unsubstituted, branched or unbranched hydrocarbyl radical;
M is a group IIIB, IVB, VB, VIB, VIIB or VIII transition metal;
T independently represents a univalent anionic ligand such as a hydrogen atom, or a substituted or unsubstituted hydrocarbyl halogeno, aryloxido, arylorganosilyl, alkyloriganosilyl, amido, arylamido, phosphido, or arylphosphido group, or two T groups taken together represent an alkylidene or a cyclometallated hydrocarbyl bidentate ligand;
L independently represents a sigma donor
Type:
Grant
Filed:
August 13, 1999
Date of Patent:
January 28, 2003
Assignees:
University of Delaware, Chevron Chemical Co.
Inventors:
Klaus H. Theopold, Woo-Kyu Kim, Leonard A. MacAdams, John M. Power, Javier M. Mora, Albert P. Masino
Abstract: This process relates to reforming a full-boiling range hydrocarbon feed in two parallel stages while maximizing the catalyst life of the heavy cut reformer and/or reducing the complexity of the plant by preferentially sending the higher purity Aromax.RTM. hydrogen to the heavy cut reformer.
Abstract: A gas phase, aromatics transalkylation process that comprises contacting a stream containing aromatic hydrocarbons with a catalyst comprising a zeolite selected from the group consisting of SSZ-26, Al-SSZ-33, CIT-1, SSZ-35, and SSZ-44 in the presence of added hydrogen and in the gas phase, to produce transalkylated product. The aromatics stream comprises one or more aromatic hydrocarbons, one of the hydrocarbons having at least one alkyl group attached thereto, the alkyl group comprising a C1, C2, C3 or C4 hydrocarbyl group. A preferred aromatics transalkylation process comprises contacting toluene or benzene or a mixture thereof with a stream containing trimethylbenzene in the presence of added hydrogen. The catalyst preferably contains a mild hydrogenation metal, such as nickel or palladium.
Type:
Grant
Filed:
April 2, 1998
Date of Patent:
September 14, 1999
Assignee:
Chevron Chemical Co. LLC
Inventors:
Gerald J. Nacamuli, Roger F. Vogel, Stacey I. Zones