21
James J Harrison, William R Ruhe Jr: One-step process for the preparation of alkenyl succinic anhydride. Chevron Research and Technology Company, Claude J Caroli, June 7, 1994: US05319030 (54 worldwide citation)

A process for the preparation of an alkenyl-substituted succinic anhydride wherein the alkenyl substituent has a number average molecular weight of from about 500 to 5000 and the average number of succinic groups per alkenyl group is greater than 1.2 which comprises reacting a polyolefin having an a ...


22
James J Harrison, William R Ruhe Jr, Jack E Morris, Jacques Cazin: Chlorine-free lubricating oils having modified high molecular weight succinimides. Chevron Research and Technology Company A Division of Chevron U, W K Turner, E A Schaal, October 18, 1994: US05356552 (52 worldwide citation)

Alkenyl or alkyl succinimide additives which are the reaction product of a high molecular weight alkenyl- or alkyl-substituted succinic anhydride and a polyalkylene polyamine having an average of greater than 4 nitrogen atoms per mole, wherein the reaction product is post-treated with a cyclic carbo ...


23
Harvey E Goodman: Method for determining rock mechanical properties using electrical log data. Chevron Research and Technology Company, M W Carson, May 16, 1995: US05416697 (49 worldwide citation)

A method for determining rock mechanical properties and for selecting a drill bit is disclosed. A set of electrical log data parameters over a selected zone in a wellbore is provided, and the respective shale and non-shale volumes are determined. A fluid-corrected Poisson's ratio for the non-shale v ...


24
Patrick J Shuler: Method of preventing in-depth formation damage during injection of water into a formation. Chevron Research and Technology Company, W K Turner, E A Schaal, October 12, 1993: US05251697 (47 worldwide citation)

In-depth formation damage is prevented during water injection by adding to the water non-compressible solids of sufficient size and concentration to form an external filter cake within the injection well. Preferably, the non-compressible solids are either diatomite, perlite, saw dust, or calcium car ...


25
Chi W Hung, Bruce E Reynolds: Process for removal of calcium from a hydrocarbon feedstock. Chevron Research and Technology Company, November 17, 1992: US05164078 (46 worldwide citation)

We disclose a process for removing calcium from a hydrocarbon feed having at least 1 ppm oil-soluble calcium. It comprises employing a catalyst layer characterized as a fixed bed of catalyst particles, a high volume percent of their pore volume in the form of macropores above 1000 Angstrom in diamet ...


26
David R Johnson: Hydrodemetalation and hydrodesulfurization catalyst of specified macroporosity. Chevron Research and Technology Company, M L Davis, C E Rincon, February 18, 1992: US05089463 (46 worldwide citation)

For a heavy hydrocarbonaceous feed, especially good hydrodemetalation and hydrodesulfurization are achieved, as well as MCR reduction, using a catalyst having 5 to 11 percent of its pore volume in the form of macropores, and a surface area greater than 75 m.sup.2 /g. Preferably the catalyst has a pe ...


27
Stacey I Zones: Zeolite SSZ-32. Chevron Research and Technology Company, Burns Doane Swecker & Mathis, October 12, 1993: US05252527 (46 worldwide citation)

A crystalline zeolite SSZ-32 of novel composition is prepared using an N-lower alkyl-N'-isopropyl-imidazolium cation as a template. Also disclosed is a process for converting hydrocarbons with crystalline zeolite SSZ-32.


28
Robert A Innes, Stacey I Zones, Gerald J Nacamuli: Liquid phase alkylation or transalkylation process using zeolite beta. Chevron Research and Technology Company, Richard J Sheridan, Thomas G DeJonghe, January 14, 1992: US05081323 (46 worldwide citation)

A process for the alkylation or transalkylation of an aromatic hydrocarbon which comprises contacting the aromatic hydrocarbon with a C.sub.2 to C.sub.4 olefin alkylating agent or a polyalkyl aromatic hydrocarbon transalkylating agent, under at least partial liquid phase conditions, and in the prese ...


29
Richard S Threlkel: Resid catalyst with high metals capacity. Chevron Research and Technology Company, June 1, 1993: US05215955 (41 worldwide citation)

A catalyst, and method of preparing and using a catalyst, for the hydrodesulfurization of metal-containing heavy feedstocks, which has improved catalytic life and metals capacity. The catalyst contains Group VIB and Group VIII metals or metal compounds on a support comprising alumina wherein the sup ...


30
David C Kramer: Process to prevent catalyst deactivation in activated slurry hydroprocessing. Chevron Research and Technology Company, W K Turner, A W Klaassen, March 29, 1994: US05298152 (41 worldwide citation)

An improved catalytic slurry hydroprocess comprising a hydrogenation zone having a hydrogen partial pressure of at least about 100 psia characterized by active catalyst recycle accompanied by minimal catalyst deactivation from coking or asphaltene agglomeration in which the improvement comprises the ...