Patents Assigned to Chevron Research and Technology Company
  • Publication number: 20020038525
    Abstract: A fuel composition for two-cycle engines comprising a major amount of fuel boiling in the gasoline range and a minor amount of a lubricant composition comprising a base oil of lubricating viscosity and an additive formulation comprising (1) a molybdenum/sulfur complex of a basic nitrogen compound, (2) a carboxylic acid amide, and (3) a succinimide.
    Type: Application
    Filed: September 16, 1994
    Publication date: April 4, 2002
    Applicant: Chevron Research and Technology Company
    Inventors: GLENN E. CALLIS, EDWARD T. SABOURIN
  • Patent number: 5879655
    Abstract: The present invention is a method for synthesizing non-zeolitic molecular sieves which have a three-dimensional microporous framework structure comprising ?AlO.sub.2 ! and ?PO.sub.2 ! units. In preparing the reaction mixture, a critical feature of the invention is for the molar ratio of the templating agent to phosphorus be greater than about 0.05 before the molar ratio of aluminum to phosphorus is greater than about 0.5.
    Type: Grant
    Filed: November 2, 1992
    Date of Patent: March 9, 1999
    Assignee: Chevron Research and Technology Company
    Inventors: Stephen J. Miller, Charles R. Wilson
  • Patent number: 5625004
    Abstract: 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:(a) reacting a polyolefin having an alkylvinylidene isomer content of less than about 10 percent and a number average molecular weight of about 500 to 5000 with maleic anhydride at a temperature in the range of about 200.degree. C. to 250.degree. C. to provide a mixture of alkenyl succinic anhydride having an average of about 1.0 succinic group per alkenyl group and unreacted polyolefin, and(b) reacting the mixture of alkenyl succinic anhydride and unreacted polyolefin from step (a) with maleic anhydride in the presence of a free radical initiator at a temperature in the range of about 100.degree. C. to 220.degree. C. to thereby provide an alkenyl succinic anhydride having an average of greater than 1.2 succinic groups per alkenyl group.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: April 29, 1997
    Assignee: Chevron Research and Technology Company
    Inventors: James J. Harrison, William R. Ruhe, Jr.
  • Patent number: 5616237
    Abstract: A fluid catalytic cracking unit equipped with multiple feed injection points along the length of the riser is operated such that portions of the same fresh feed are charged to different feed injection points. Preferably, the hydrocarbon fresh feed can be split into two or more non-distinct fractions, with one fraction charged to the bottom injection point along the length of the riser reactor, and the remaining fractions charged to injection points progressively higher up along the length of the riser reactor with the temperature of the upper injection feed fractions being different from that of the lowest injection point fraction prior to entry into the FCC riser reactor. Hydrocarbon products from the cracking process can be recycled to one or more of the various injection points along the length of the riser.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: April 1, 1997
    Assignee: Chevron Research and Technology Company, A Division of Chevron U.S.A. Inc.
    Inventors: Ashok S. Krishna, Robert C. Skocpol, Lewis A. Frederickson
  • Patent number: 5593570
    Abstract: A physically intermixed catalyst system comprising two distinctly different catalytic particles, the first of which is a hydrodenitrification and/or hydrodesulfurization catalyst and the second of which is a relatively active hydrocracking catalyst, wherein the catalyst particles of both catalytic components are substantially the same size, that is the effective diameter of each catalyst component is substantially the same. The catalyst system of the present invention can be layered with unmixed catalysts. The novel systems of the present invention have been found to provide surprisingly good selectivity for liquid products and stability against catalyst fouling when used in combined hydrotreating and hydrocracking applications, and can therefore be used to provide a stable catalyst system which offers even heat distribution and reactor control in such applications.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: January 14, 1997
    Assignee: Chevron Research and Technology Company, A Division of Chevron U.S.A. Inc.
    Inventors: Mohammad M. Habib, Philip L. Winslow, Richard O. Moore, Jr.
  • Patent number: 5556900
    Abstract: Disclosed is a thermoplastic polymer-linked-asphalt and a process for making a thermoplastic polymer-linked-asphalt. More particularly, disclosed is a reaction process for linking epoxide-containing polymers to asphalt. The improved thermoplastic polymer-linked-asphalt product is particularly useful in road paving and roofing applications.
    Type: Grant
    Filed: November 10, 1994
    Date of Patent: September 17, 1996
    Assignees: Chevron Research and Technology Company, E. I. Du Pont de Nemours & Co.
    Inventors: J. L. Goodrich, R. J. Statz
  • Patent number: 5526684
    Abstract: A self-regulating apparatus and method for measuring the components of a multiphase petroleum stream includes initially stratifying an incoming petroleum stream into substantially liquid and gas streams. The initial fluid stratification allows a flow-splitting separation to occur as the streams first enter a vertical separation tube. By positioning the inflow line eccentric to the vertical separation tube, a liquid vortex is created by the incoming liquid component to further enhance the liquid/gas separation. The liquid component is then drawn off by a liquid flow line also eccentrically positioned on the vertical separator, thereby minimizing the energy dissipation of the liquid vortex. Both the gas and liquid components can then be individually measured before being recombined at a common outflow port for discharge.
    Type: Grant
    Filed: January 10, 1994
    Date of Patent: June 18, 1996
    Assignee: Chevron Research and Technology Company, a Division of Chevron U.S.A. Inc.
    Inventors: K. T. Liu, William Rieken, J. P. Anduiza, G. E. Kouba
  • Patent number: 5522983
    Abstract: A process is provided for converting a hydrocarbon feedstock comprising the steps of introducing the hydrocarbon feedstock to a first hydroconversion zone at superatmospheric pressure and at a temperature between about 450.degree. F. and about 850.degree. F. in the presence of hydrogen, the hydrogen flowing in a countercurrent relationship to the hydrocarbon feedstock, to form a hydrogen-rich vapor effluent and a hydrocarbon-rich liquid effluent; reacting the hydrogen-rich vapor effluent in a second hydroconversion zone to form a converted vapor effluent; and introducing a portion of the hydrocarbon-rich liquid effluent to the second hydroconversion zone in countercurrent relationship to the hydrogen-rich vapor effluent. By recycling to the second hydroconversion zone a stream having sufficiently high boiling range that it remains a liquid, a greater range of operating conditions are possible in the second hydroconversion zone, thus allowing for higher conversions and product yields.
    Type: Grant
    Filed: February 6, 1992
    Date of Patent: June 4, 1996
    Assignee: Chevron Research and Technology Company
    Inventors: Dennis R. Cash, Robert W. Bachtel
  • Patent number: 5520329
    Abstract: A method and apparatus for measuring and compensating for the impact of environmental effects on industrial processing units. A thermal test element having a low thermal mass and high conductivity is exposed to the environment. Ambient air temperature is sensed at a nearby location, and a differential temperature controller determines how much energy is required to maintain the test element at a desired temperature differential from ambient temperature. Duty cycle and wattage outputs enable feedforward compensation for environmentally induced process unit control disturbances.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: May 28, 1996
    Assignee: Chevron Research and Technology Company, a Division of Chevron U.S.A. Inc.
    Inventors: Russell M. Clinton, III, William P. Jones, Mark A. Roffman
  • Patent number: 5502266
    Abstract: The present invention deals with separating well fluids produced from a gas condensate reservoir into a condensate phase and a gas phase. The invention provides combining two stage separation, a stabilizer column and gas processing systems to achieve increased liquid yield and dry gas for take off (export) with much lower energy costs and capital costs. First stage separation pressure is maintained between 600 psi and 1500 psi. Second stage separation pressure is maintained at a higher pressure than that required to achieve the liquid vapor pressure specification, usually between 400 psig and 600 psig. The stabilizing column produces a stabilized liquid (preferably having a vapor pressure about 8.2 psia at 80.degree. F.) by operating the column bottom at approximately 240.degree. F./50 psig.
    Type: Grant
    Filed: October 19, 1992
    Date of Patent: March 26, 1996
    Assignee: Chevron Research and Technology Company, a Division of Chevron U.S.A. Inc.
    Inventor: John E. Hodson
  • Patent number: 5439860
    Abstract: A physically intermixed catalyst system comprising two distinctly different catalytic particles, the first of which is a hydrodenitrification and/or hydrodesulfurization catalyst and the second of which is a relatively active hydrocracking catalyst, wherein the catalyst particles of both catalytic components are substantially the same size, that is the effective diameter of each catalyst component is substantially the same. The catalyst system of the present invention can be layered with unmixed catalysts. The novel systems of the present invention have been found to provide surprisingly good selectivity for liquid products and stability against catalyst fouling when used in combined hydrotreating and hydrocracking applications, and can therefore be used to provide a stable catalyst system which offers even heat distribution and reactor control in such applications.
    Type: Grant
    Filed: April 7, 1993
    Date of Patent: August 8, 1995
    Assignee: Chevron Research and Technology Company, a Division of Chevron U.S.A. Inc.
    Inventors: Mohammad M. Habib, Philip L. Winslow, Richard O. Moore, Jr.
  • Patent number: 5439583
    Abstract: A process is disclosed for removing residual sulfur from a hydrotreated naphtha feedstock. The feedstock is contacted with molecular hydrogen under reforming conditions in the presence of a less sulfur sensitive reforming catalyst to convert trace sulfur compounds to H.sub.2 S, and to form a first effluent. The first effluent is contacted with a solid sulfur sorbent to remove the H.sub.2 S and form a second effluent. The second effluent is then contacted with a highly selective reforming catalyst under severe reforming conditions. Also disclosed is a method using a potassium containing sulfur sorbent made from nitrogen-free potassium compounds.
    Type: Grant
    Filed: January 4, 1993
    Date of Patent: August 8, 1995
    Assignee: Chevron Research and Technology Company
    Inventors: Richard C. Robinson, Robert L. Jacobson, Harris E. Kluksdahl, William A. Blanton, Dennis L. Holtermann, Leslie A. Field
  • Patent number: 5425933
    Abstract: Molecular sieves, particularly zeolites, are prepared using heterobridged aza-polycyclic templates. The templates may be prepared in a series of reaction steps which include a Diels-Alder reaction between a diene and a dienophile.
    Type: Grant
    Filed: February 8, 1994
    Date of Patent: June 20, 1995
    Assignee: Chevron Research and Technology Company, A Division of Chevron U.S.A. Inc.
    Inventor: Yumi Nakagawa
  • Patent number: 5416697
    Abstract: 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 volume is determined. Shear wave velocity for the shale volume is then determined and a corrected Poisson's ratio, relating to shale volume and fluid composition is determined. Uniaxial compressive strength, angle of internal friction, and cohesive shear strength can be determined, and drill bits selection can therefore be made more accurately.
    Type: Grant
    Filed: July 31, 1992
    Date of Patent: May 16, 1995
    Assignee: Chevron Research and Technology Company
    Inventor: Harvey E. Goodman
  • Patent number: 5415037
    Abstract: A method and apparatus for determining the temperature in a wellbore is disclosed. The apparatus is lowered into a wellbore to a desired depth and logged over a selected interval. At least one first heat flux and temperature sensor contacts the wellbore wall. At least one second heat flux and temperature sensor is maintained in contact with the drilling fluid. Comparison of sensor responses provides an accurate determination of the wellbore wall temperature, and a determination of the quality of sensor-wellbore wall contact.
    Type: Grant
    Filed: December 4, 1992
    Date of Patent: May 16, 1995
    Assignee: Chevron Research and Technology Company
    Inventors: Suzanne Griston, John Crowe, Barry A. Reik
  • Patent number: 5413700
    Abstract: A method for reforming hydrocarbons comprising coating portions of a reactor system with a material more resistant to carburization, reacting the material with metal oxides existing in the portions of the reactor system prior to coating, fixating or removing at least a portion of the oxide in the metal oxides, and reforming hydrocarbons in the reactor system under conditions of low sulfur.
    Type: Grant
    Filed: January 4, 1993
    Date of Patent: May 9, 1995
    Assignee: Chevron Research and Technology Company
    Inventors: John V. Heyse, Bernard F. Mulasky
  • Patent number: 5413695
    Abstract: The invention provides for a process for producing lube oil having excellent viscosity and viscosity index properties and a low pour point from a solvent refined gas oil. The process comprises contacting a raffinate having a solvent dewaxed viscosity index of at least 90 and boiling above 350.degree. F. with a catalyst comprising an intermediate pore size silicoaluminophosphate molecular sieve and at least one Group VIII metal under dewaxing and isocracking conditions so as to produce a product having a viscosity index greater than about 110.
    Type: Grant
    Filed: January 6, 1993
    Date of Patent: May 9, 1995
    Assignee: Chevron Research and Technology Company, a Division of Chevron U.S.A. Inc.
    Inventor: Stephen J. Miller
  • Patent number: 5407558
    Abstract: A method is provided of selecting operating parameters for an aromatization process having at least penultimate and final stages, each containing a respective catalyst, for optimum aromatic barrel per calendar day (AB/CD) production of product having a selected RON and/or over a particular run length. The catalyst lives are determined at constant LHSV for the penultimate and final stage catalysts for a given feed RON to each stage as a function of the change in RON from that of the feed to that of the C.sub.5+ effluent from the respective stage. The penultimate stage C.sub.5+ effluent RON is selected to be such that the lives of the catalysts in each stage are substantially equal. Preferably the yield of C.sub.5+ effluent from each stage and the life of the catalyst used in each stage is determined as a function of the pressure of that stage. The operating pressures of the stages are then selected to be within about 30% of that which gives the highest AB/CD.
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: April 18, 1995
    Assignee: Chevron Research and Technology Company
    Inventors: Jules M. Kline, Stephen J. Miller, Bernard F. Mulaskey
  • Patent number: 5406014
    Abstract: Disclosed are methods for dehydrogenation of alkanes into alkenes in reactor systems of improved resistance to carburization under dehydrogenation conditions. The reactor walls are provided with a carburization and abrasion resistant protective layer by applying a metal plating, cladding or other coatings, such as painting, of a metal, such as Sb, As, Bi, Cu, Cr, Ga, Ge, In, Pb, Se, Te, Sn, particularly tin as a stannide layer, for forming a carburation resistant protective layer to a thickness of about 0.5 to 15 mils, effective to isolate the steel portion from hydrocarbons during the dehydrogenation process while avoiding any substantial liquid metal embrittlement. The protective layer is formed anchored to the steel portion through an intermediate carbide-rich bonding layer.
    Type: Grant
    Filed: January 4, 1994
    Date of Patent: April 11, 1995
    Assignee: Chevron Research and Technology Company
    Inventors: John V. Heyse, Paul G. Johnson, Bernard F. Mulaskey
  • Patent number: RE36403
    Abstract: A fluid catalytic cracking unit equipped with multiple feed injection points along the length of the riser is operated such that portions of the same fresh feed are charged to different feed injection points. Preferably, the hydrocarbon fresh feed can be split into two or more non-distinct fractions, with one fraction charged to the bottom injection point along the length of the riser reactor, and the remaining fractions charged to injection points progressively higher up along the length of the riser reactor. Unconverted slurry oil boiling above 650.degree. F. can be recycled to one or more of the various injection points along the length of the riser.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: November 23, 1999
    Assignee: Chevron Research and Technology Company
    Inventor: Ashok S. Krishna