Patents Assigned to Chevron Research & Technology Company
  • Process for recovering a trialkyl phosphate ester from a trialkyl and aryl phosphate ester-based functional fluid
    Patent number: 5258539
    Abstract: A process for recovering a trialkyl phosphate ester from a phosphate ester-based functional fluid by treating the fluid with an alkoxide salt, and thereafter, distilling the fluid to recover the trialkyl phosphate ester essentially free of aryl-containing phosphate esters and epoxide-containing hydrolysis inhibitors initially present in the fluid.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: November 2, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: Mark E. Okazaki
  • Zeolite SSZ-37
    Patent number: 5254514
    Abstract: A crystalline zeolite SSZ-37 is prepared using a N,N-dimethyl-4-azoniatricyclo [5.2.2.0.sup.(2,6) ] undec-8-ene cation as a template wherein said zeolite is used in hydrocarbon conversion processes.
    Type: Grant
    Filed: June 30, 1992
    Date of Patent: October 19, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: Yumi Nakagawa
  • Zeolite SSZ-32
    Patent number: 5252527
    Abstract: 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.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: October 12, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: Stacey I. Zones
  • Method of preventing in-depth formation damage during injection of water into a formation
    Patent number: 5251697
    Abstract: 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 carbonate, and the concentration of non-compressible solids is from 0.001 to 5 wt%. When no longer needed, the external filter cake is removed from the injection well by using an acid wash or back-flowing the well.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: October 12, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: Patrick J. Shuler
  • Pipe joint assembly
    Patent number: 5248173
    Abstract: Disclosed is a pipe joint assembly comprising: a first and second pipe having smooth, essentially cylindrical ends; an elastomeric tape which is essentially triangular in cross-section, said tape having two surfaces, one of which is flat and the other of which tapers downward from its center to the edges of the tape; said elastomeric tape being wrapped around said first pipe adjacent one end of said first pipe with said flat surface of said tape being in contact with the outer surface of said first pipe; said first pipe having an outside diameter such that said first pipe fits matingly into one end of said second pipe with the elastomeric tape in contact with both the outer surface of said first pipe and the inner surface of said second pipe.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: September 28, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: James R. Copeland
  • Wax isomerization using catalyst of specific pore geometry
    Patent number: 5246566
    Abstract: The present invention relates to a process for producing a lube oil having a low pour point and excellent viscosity and viscosity index comprising isomerizing a waxy feed over a catalyst comprising a molecular sieve having generally oval 1-D pores having a minor axis between about 4.2 .ANG. and about 4.8 .ANG. and a major axis between about 5.4 .ANG. and about 7.0 .ANG. and at least one group VIII metal. SAPO-11, SAPO-31, SAPO-41, ZSM-22, ZSM-23 and ZSM-35 are examples of useful catalysts.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: September 21, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: Stephen J. Miller
  • Method for enhancing the recovery of petroleum from an oil-bearing formation using a mixture including anionic and cationic surfactants
    Patent number: 5246072
    Abstract: A foam-forming composition comprising a mixture of at least one anionic surfactant and at least one cationic surfactant can effectively form a foam in a variety of formations including an oil-wet environment. In particular, this composition can be employed in a method which comprises at least periodically injecting a gas and this foam-forming composition into an oil-bearing formation to drive oil to a production well. In this composition, the ratio of the at least one anionic surfactant to the at least one cationic surfactant is selected so that the surfactants do not form substantial amounts of precipitate when mixed together. In certain environments, e.g., when the formation contains upwards of 20% total dissolved solids and/or a divalent metal ion concentration up to about 20,000 ppm, the composition can further contain at least one salt-tolerance additive, e.g., a nonionic surfactant.
    Type: Grant
    Filed: August 14, 1991
    Date of Patent: September 21, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: Rawls H. Frazier, Jr., Donald L. Kuehne, Willie Horn, Jr., Jeremy Cantor
  • Lubricating oil compositions for internal combustion engines having silver bearing parts
    Patent number: 5244591
    Abstract: Essentially chlorine-free lubricating compositions having a TBN of 10-30 designed for use in internal combustion engines having silver bearing parts which provide protection for said bearings via the incorporation therein of certain unsaturated aliphatic carboxylic acids. An additive concentrate for said lubricating compositions is also disclosed.
    Type: Grant
    Filed: March 23, 1992
    Date of Patent: September 14, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: Wesley A. Middleton
  • Method for reducing the production of liquids from a gas well
    Patent number: 5244043
    Abstract: A method for reducing the amount of liquids produced from a selected geologic formation of a gas producing well is disclosed. A solution comprising controlled quantities of a scaling cation brine and scaling anion brine such that a scale will precipitate, and a controlled quantity of a scale inhibitor such that the scale precipitation will be delayed, is injected into the formation. The well is then shut-in long enough to allow the injected mixture to precipitate scale and to reduce the permeability of the formation such that a substantial portion of liquids that had been produced before, no longer are produced upon a resumption of gas production.
    Type: Grant
    Filed: November 19, 1991
    Date of Patent: September 14, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: Patrick J. Shuler
  • Dimeric and tetrameric cyclopentadienyl group 6B metal alpha-olefin polymerization catalysts and process for polymerizing alpha-olefins
    Patent number: 5240895
    Abstract: Disclosed is a catalyst system for the homopolymerization and copolymerization of alpha-olefins having 2-8 carbon atoms, said catalyst system comprising a dimeric or tetrameric cyclopentadienyl Group 6b metal compound in which the metal has an oxidation state of +2, said Group 6b metal compound being supported on an inorganic support. The catalyst system may also contain a Group 2 or Group 3 metal alkyl compound cocatalyst.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: August 31, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: Michael J. Carney, David L. Beach
  • Process for removing dissolved organics from aqueous compositions
    Patent number: 5236590
    Abstract: A process is disclosed for removing dissolved organics from an aqueous composition, said composition comprising water, carbon dioxide and dissolved organics, and said composition having a pH of 6.5 or less and an inlet organics concentration. The process comprises the steps of feeding said aqueous composition to a centrifugal separation zone, preferably to a hydrocyclone, depressurizing said composition in said centrifugal separation zone to regasify at least a portion of said carbon dioxide. An aqueous product stream is removed from the centrifugal separation zone wherein the concentration of said organics is less than said inlet organics concentration. The process is particularly useful in the cleanup of industrial wastewater, and also for removing organics from water produced in petroleum production operations.
    Type: Grant
    Filed: November 21, 1991
    Date of Patent: August 17, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: Steven F. Sciamanna, Michael Dubrovsky
  • Method for foam emplacement in gas flooding for enhanced oil recovery
    Patent number: 5234054
    Abstract: A method for improving the sweep efficiency of gas or steam flooding operations by reducing the permeability of relatively high permeability thief zones of an oil bearing subterranean reservoir having heterogeneous and/or fracture permeability and that is penetrated by at least one well is disclosed. A controlled quantity of a surfactant is injected into a high-permeability zone of a reservoir. Controlled quantities of a gas and a subsequent surfactant are then injected, simultaneously or alternatively into the same well, so that a controlled amount of foam having a controlled quality is generated in the high permeability zone, thereby reducing permeability. Following foam emplacement, a chase gas may be injected, and the steps of injecting surfactant and gas may be repeated as necessary to lower the gas-oil ration of non-problem offset producing wells to a preset limit.
    Type: Grant
    Filed: September 12, 1991
    Date of Patent: August 10, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: Shang Chou
  • Lubricating compositions
    Patent number: 5232616
    Abstract: Provided are lubricating oil compositions which contain (a) a mixture comprising an oil-soluble alkali metal compound and certain polyalkenyl succinimide or (b) alkali metal salts of said polyalkenyl succinimides.
    Type: Grant
    Filed: August 21, 1990
    Date of Patent: August 3, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: James J. Harrison, Curtis B. Campbell
  • Hydrocracking process with polycyclic aromatic dimer removal
    Patent number: 5232577
    Abstract: A process for separation and removal of stable polycyclic aromatic dimer foulants from refinery process streams by blending a paraffinic stream with a portion of heavy effluent from a hydrocracking reactor to induce precipitation of foulant, which may then be separated and removed from the hydrocracker. Additional embodiments include introduction of flocculating agents and adjusting the temperature of the blend.
    Type: Grant
    Filed: August 14, 1990
    Date of Patent: August 3, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: John C. Fetzer, John M. Rosenbaum, Robert W. Bachtel, Dennis R. Cash, David G. Lammel
  • Retarding skin formation on hot asphalt
    Patent number: 5224992
    Abstract: Organotin hydrides are effective in retarding oxidative skin formation in asphalts maintained at elevated temperature.
    Type: Grant
    Filed: July 1, 1992
    Date of Patent: July 6, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: Edgar L. McGinnis
  • Method of making molecular sieves
    Patent number: 5225179
    Abstract: A method for synthesizing molecular sieves is disclosed. The method comprises preparing an aqueous mixture comprising:a) a source zeolite, wherein said source zeolite contains sodalite substructures and has a tetrahedra atom density of less than about 15 TO.sub.2 per 1000 .ANG..sup.3, and wherein said source zeolite has a silica/alumina mole ratio greater than 200; an alkali metal oxide; and an organic template, and wherein said aqueous mixture has a composition in terms of mole ratios of oxides falling within the following ranges:______________________________________ M+/SiO.sub.2 = 0.01-1.00 OH-/SiO.sub.2 = 0.15-0.80 H.sub.2 O/SiO.sub.2 = 20-120 Q/SiO.sub.2 = 0.10-1.00 SiO.sub.2 /Y.sub.2 O.sub.
    Type: Grant
    Filed: August 27, 1992
    Date of Patent: July 6, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: Stacey I. Zones, Yumi Nakagawa
  • Method for making anhydride from ester using a palladium-containing catalyst system
    Patent number: 5220060
    Abstract: Methylene and oxymethylene bis-esters are produced by the reaction of an aliphatic ester of a carboxylic acid, formaldehyde and carbon monoxide in the presence of a catalytic amount of a Group VIII noble transition metal compound, an iodide or bromide promoter, and a proton donor.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: June 15, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: Seymour J. Lapporte, William G. Toland
  • Ethylene-alkyl acrylate copolymer saponification process
    Patent number: 5218057
    Abstract: Disclosed is a method for saponifying an ethylene-alkyl acrylate copolymer comprising mixing together an ethylene-alkyl acrylate copolymer and an aqueous solution of an inorganic alkali metal base at a temperature sufficient for saponification to take place and at which the ethylene-alkyl acrylate copolymer undergoes a phase change.
    Type: Grant
    Filed: July 10, 1991
    Date of Patent: June 8, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: Victor P. Kurkov, Leslie P. Theard
  • Resid catalyst with high metals capacity
    Patent number: 5215955
    Abstract: 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 support has at least 80 percent of said pore volume in pores having a diameter of between 110 and 190 .ANG. and at least 70 percent of said pore volume in pores having a diameter between 130 and 200 .ANG..
    Type: Grant
    Filed: October 2, 1991
    Date of Patent: June 1, 1993
    Assignee: Chevron Research and Technology Company
    Inventor: Richard S. Threlkel
  • Hydrocarbon conversion processes using SSZ-31
    Patent number: 5215648
    Abstract: Hydrocarbon conversion processes using a crystalline zeolite SSZ-31.
    Type: Grant
    Filed: January 3, 1992
    Date of Patent: June 1, 1993
    Assignee: Chevron Research and Technology Company
    Inventors: Stacey I. Zones, Thomas V. Harris, Andrew Rainis, Donald S. Santilli