Patents Represented by Attorney A. Stephen Zavell
  • Patent number: 8137531
    Abstract: An integrated process for producing liquid fuel and lubricating base oil from Fischer-Tropsch derived products which comprises (a) recovering separately from a Fischer-Tropsch synthesis reactor a Fischer-Tropsch wax and condensate; (b) hydroprocessing the wax and recovering a waxy intermediate and a hydrogen-rich normally, liquid fraction; (c) mixing the condensate and at least part of the hydrogen-rich normally liquid fraction to form a Fischer-Tropsch condensate mixture; (d) hydrotreating the condensate mixture and recovering a Fischer-Tropsch condensate product; (e) recovering from the condensate product a liquid fuel; (f) separately dewaxing the waxy intermediate and recovering a base oil; (g) hydrofinishing the base oil; (h) recovering from the hydrofinishing zone a stabilized base oil and a hydrogen-rich gas; and (i) recycling the hydrogen-rich gas to the wax hydroprocessing zone wherein the total pressure in the hydrofinishing zone is at least as high as the total pressure in the wax hydroprocessing zo
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: March 20, 2012
    Assignee: Chevron U.S.A. Inc.
    Inventors: Darush Farshid, Richard O. Moore, Jr.
  • Patent number: 7884138
    Abstract: A process is described by which an olefinic naphtha and a hydrogenated distillate fuel are made from a Fischer-Tropsch process. The olefinic naphtha is suitable for use in an ethylene cracker where the olefins enhance the formation of ethylene. Thy hydrogenated distillate fuel is used in jet and or diesel fuels. Optionally the olefinic naphtha has a low content of acids. This low acid content, is obtained by operating the Fischer-Tropsch unit at H2/CO ratios from 1.8 to 2.05 or treating the effluent from the Fischer-Tropsch unit with a metal oxide to remove the acids.
    Type: Grant
    Filed: December 14, 2007
    Date of Patent: February 8, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventors: Jerome F. Mayer, Dennis J. O'Rear
  • Patent number: 7785378
    Abstract: The present invention is directed to a Fischer-Tropsch derived distillate suitable for use as a turbine fuel having a flash point 38° C. minimum measured by ASTM D 56 and a freeze point of ?40° C. or less and further containing not less than 0.01 wt. % oxygen in each of 1-pentanol, 1-hexanol, and 1-heptanol and not more than about 0.01 wt. % oxygen in C8+ linear alcohols. Preferably, the Fischer-Tropsch derived distillate will have a freeze point of at least ?47° C., and more preferably the freeze point of the Fischer-Tropsch derived distillate will be not less than ?50° C. All the wt. % oxygen amounts are on a water free basis.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: August 31, 2010
    Assignee: Chevron U.S.A. Inc.
    Inventor: Dennis J. O'Rear
  • Patent number: 7726358
    Abstract: A method for loading LNG on a floating vessel through a conduit having the inlet, an outlet and an intermediate port located between the inlet and the outlet. The method includes the step of pumping a reduced flow of LNG into the inlet and the step of pumping a reduced flow of LNG into the intermediate port so that different sections of the conduit can be cooled simultaneously. When the conduit has cooled to a temperature suitable for transferring LNG, the method further includes pumping an increased flow of the LNG into the inlet of the conduit. The LNG can then be directed from the outlet to a storage tank onboard a floating vessel.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: June 1, 2010
    Assignee: Chevron U.S.A. Inc.
    Inventors: John S. Hartono, Kenneth W. Sheets, Jr.
  • Patent number: 7726359
    Abstract: A method for transferring a cryogenic fluid from a floating vessel. The cryogenic fluids to be transferred can include liquefied hydrocarbon gases such as LNG. The method includes the steps of pumping a reduced flow of a cryogenic fluid into a first end and/or a second end of a conduit to begin pre-cooling the conduit. Pre-cooling also includes pumping a reduced flow of the cryogenic fluid into the conduit at a point intermediate the first end and the second end so that different sections of the conduit are cooled simultaneously. When the conduit has cooled to a temperature suitable for transferring the cryogenic fluid, an increased flow of the cryogenic fluid is pumped into the first end of the conduit to transfer the cryogenic fluid from the floating vessel. The cryogenic fluid can then be directed from the second end of the conduit to a storage tank on shore or onboard a second floating vessel.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: June 1, 2010
    Assignee: Chevron U.S.A. Inc.
    Inventors: John S. Hartono, Kenneth W. Sheets, Jr.
  • Patent number: 7520976
    Abstract: A multigrade engine oil meeting the specifications for SAE J300 revised June 2001 requirements and a process for preparing it, said engine oil comprising (a) between about 15 to about 94.5 wt % of a hydroisomerized distillate Fischer-Tropsch base oil characterized by (i) a kinematic viscosity between about 2.5 and about 8 cSt at 100° C., (ii) at least about 3 wt % of the molecules having cycloparaffin functionality, and (iii) a ratio of weight percent molecules with monocycloparaffin functionality to weight percent of molecules with multicycloparaffin functionality greater than about 15; (b) between about 0.5 to about 20 wt % of a pour point depressing base oil blending component prepared from an hydroisomerized bottoms material having an average degree of branching in the molecules between about 5 and 9 alkyl-branches per 100 carbon atoms and wherein not more than 10 wt % boils below about 900° F.
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: April 21, 2009
    Assignee: Chevron U.S.A. Inc.
    Inventors: Stephen J. Miller, John M. Rosenbaum, Susan M. Abernathy
  • Patent number: 7416656
    Abstract: A process for removing aluminum contaminants from the product of a Fischer-Tropsch synthesis reaction wherein said contaminants comprise at least 1 ppm of aluminum expressed as elemental metal in aluminum-containing contaminants having an effective diameter of less than 1 micron, said process comprising the steps of (a) collecting the contaminated Fischer-Tropsch product from the Fischer-Tropsch reactor; (b) forming a mixture comprising the contaminated Fischer-Tropsch product, at least an equal molar amount of a dicarboxylic acid containing from 2 to about 8 carbon atoms based upon the amount of aluminum present, and sufficient water for the dicarboxylic acid to form hydrogen ions; (c) maintaining the mixture under pre-selected conditions for a time sufficient for the aluminum contaminant and the dicarboxylic acid to form an aluminum containing precipitate having an effective diameter of greater than about 1 micron; (d) passing the mixture of step (c) through a particulate removal zone capable of removing su
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: August 26, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Alexander Kuperman, Lucy Melinda Bull, Dennis J. O'Rear, Donald Kuehne
  • Patent number: 7404888
    Abstract: A process for reducing the metal corrosion of a hydrocarbonaceous liquid which causes corrosion as measured by NACE Standard TM0172-2001, said process comprising blending with the hydrocarbonaceous liquid at least 0.1 weight percent of an acidic Fischer-Tropsch product in sufficient proportion to produce a hydrocarbonaceous blend displaying reduced metal corrosion as measured by NACE Standard TM0172-2001 when compared to the hydrocarbonaceous liquid and a hydrocarbonaceous blend prepared by the process.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: July 29, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis J. O'Rear, Greg Hemighaus, Gunther H. Dieckmann
  • Patent number: 7384538
    Abstract: A process for the hydroisomerization of a waxy feed having a major portion boiling above 650° F. to produce a lubricating base oil having a lower pour point, said process comprising (a) passing the waxy feed along with hydrogen gas through a hydroisomerization zone maintained at a hydrogen partial pressure of between about 100 psia and about 400 psia, said hydroisomerization zone comprising a catalyst bed containing at least two active wax hydroisomerization catalysts, said catalysts comprising at least (i) a first catalyst comprising an active hydrogenation component and a 1-D, 10-ring molecular sieve having a maximum crystallographic free diameter of the channels equal to 6.2 ? units or greater and (ii) a second catalyst comprising an active hydrogenation component and a 1-D, 10-ring molecular sieve having a maximum crystallographic free diameter of the channels equal to 5.
    Type: Grant
    Filed: November 2, 2004
    Date of Patent: June 10, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventor: Stephen J. Miller
  • Patent number: 7332073
    Abstract: A process for removing contaminants from the products of a Fischer-Tropsch synthesis reaction, said contaminants comprising (i) particulates having an effective diameter of greater than 1 micron and (ii) at least 5 ppm of aluminum in aluminum-containing contaminants having an effective diameter of less than 1 micron, said process comprising the steps of (a) passing the products of the Fischer-Tropsch synthesis reaction through a first particulate removal zone capable of removing particulates having an effective diameter of greater than 1 micron; (b) collecting from the first particulate removal zone a substantially particulate free Fischer-Tropsch feed stream containing 5 ppm or more of aluminum in aluminum containing-contaminants having an effective diameter of less than about 1 micron; (c) contacting the substantially particulate free Fischer-Tropsch feed stream in up-flow mode with an aluminum active catalyst in a guard-bed under aluminum activating conditions, whereby a feed stream mixture is formed which
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: February 19, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventor: David R. Johnson
  • Patent number: 7074320
    Abstract: An integrated process for preparing a lubricating oil base stock includes an isomerization step followed by a solvent dewaxing step. A waxy feed is isomerized to an intermediate pore point, which is at least 6° C. above a target pour point, over a select molecular sieve having specified pore properties. The isomerized oil is then solvent dewaxed to a very low pour point. This process produces a dewaxed lubricating oil base stock which has an exceptionally high viscosity index.
    Type: Grant
    Filed: July 24, 2003
    Date of Patent: July 11, 2006
    Assignee: Chevron U.S.A. Inc.
    Inventor: Stephen J. Miller
  • Patent number: 6663768
    Abstract: An integrated process for preparing a lubricating oil base stock includes an isomerization step followed by a solvent dewaxing step. A waxy feed is isomerized to an intermediate pore point, which is at least 6° C. above a target pour point, over a select molecular sieve having specified pore properties. The isomerized oil is then solvent dewaxed to a very low pour point. This process produces a dewaxed lubricating oil base stock which has an exceptionally high viscosity index.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: December 16, 2003
    Assignee: Chevron U.S.A. Inc.
    Inventor: Stephen J. Miller
  • Patent number: 6596780
    Abstract: Hydrocarbonaceous fuel, such as coal, oil or gas, is gasified to produce syngas comprising H2 and CO, scrubbed free of particles, and saturated with water. The syngas is then treated in an acid gas removal unit as desired to remove any impurities in the syngas. After processing the syngas in the AGR, it is routed to a hydrocarbon synthesis reactor. In the hydrocarbon synthesis reactor, the bulk of the H2 and CO in the syngas is converted to synthetic hydrocarbons, the makeup of which is generally dependent on the type catalyst used in the reactor. The unreacted gas, or tailgas, exiting the reactor, is sent to the gas turbine as fuel. Optionally, N2 or natural gas can be added to the tailgas prior to the combustion turbine. N2 may also optionally be mixed with the hydrocarbon synthesis reactor feed to help control the reaction temperature. After being combusted in the combustor of a gas turbine, the combustion products are expanded to produce power.
    Type: Grant
    Filed: October 23, 2001
    Date of Patent: July 22, 2003
    Assignee: Texaco Inc.
    Inventors: Fred C. Jahnke, Dipak C. Kothari, Lalit S. Shah, William P. Volk, Kamlesh B. Vakil, Rui Song, Gayla D. Hamby
  • Patent number: 6269881
    Abstract: An oil recovery process is disclosed which uses a particular class of alkylaryl sulfonate surfactants. The surfactants are derived from an alpha-olefin stream having a broad distribution of even carbon numbers ranging from 12 to 58. The olefin stream is reacted with aromatic feedstock, such as benzene, toluene, xylene, or a mixture thereof to form alkylates, and then reacted with SO3 to form sulfonic acids. The resulting surfactant has high solubilization and ultra-low interfacial tension with crude oils, especially waxy crude oil, having a broad distribution of carbon numbers.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: August 7, 2001
    Assignees: Chevron U.S.A. Inc, Chevron Chemical Company LLC
    Inventors: Shang Chou, Curtis B. Campbell
  • Patent number: 6136181
    Abstract: The present invention relates to a novel platinum palladium alloy catalyst useful in hydrofinishing and hydrocracking non low sulfur content feedstock and the process of hydrofinishing and hydrocracking such non low sulfur content feedstock feeds. The catalyst maintains the activity of a palladium catalyst with the sulfur tolerance of a platinum catalyst without the need for the higher reaction temperatures normally associated with platinum based catalysts and thus avoid the higher rates of undesirable cracking reactions in the fabrication of a lubricating base oil stock.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: October 24, 2000
    Assignee: Chevron U.S.A. Inc.
    Inventor: James N. Ziemer
  • Patent number: 6086848
    Abstract: The present invention relates to a process for preparing zeolites having 12-ring pores and having at least one internal pore structure with a cross section measuring greater than 7.5 .ANG. using substituted-piperidinium cations as organic templates.
    Type: Grant
    Filed: December 17, 1997
    Date of Patent: July 11, 2000
    Assignee: Chevron U.S.A. Inc.
    Inventors: Yumi Nakagawa, Gregory S. Lee, Stacey I. Zones
  • Patent number: 6086749
    Abstract: A method and catalyst mixture for hydroprocessing a hydrocarbon feed stream through a moving catalyst bed having a catalyst mixture and contained within a single onstream reactor vessel. The reactor vessel contains the catalyst mixture which includes two or more different and distinct catalyst for any hydroprocessing application. The different and distinct catalyst have different catalyst density and are designed for a different function, such as HDM and HDN. The different and distinct catalysts can also have different average residence times if their densities and physical properties are properly selected.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: July 11, 2000
    Assignee: Chevron U.S.A. Inc.
    Inventors: David C. Kramer, Bruce E. Stangeland
  • Patent number: 6080382
    Abstract: The present invention relates to new crystalline zeolite SSZ-48 prepared using a decahydroquinolinium cation templating agent.
    Type: Grant
    Filed: December 17, 1997
    Date of Patent: June 27, 2000
    Assignee: Chevron U. S. A. Inc.
    Inventors: Gregory S. Lee, Stacey I. Zones
  • Patent number: 6030921
    Abstract: The present invention relates to a novel platinum palladium alloy catalyst useful in hydrofinishing and hydrocracking non low sulfur content feedstock and the process of hydrofinishing and hydrocracking such non low sulfur content feedstock feeds. The catalyst maintains the activity of a palladium catalyst with the sulfur tolerance of a platinum catalyst without the need for the higher reaction temperatures normally associated with platinum based catalysts and thus avoid the higher rates of undesirable cracking reactions in the fabrication of a lubricating base oil stock.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: February 29, 2000
    Assignee: Chevron U.S.A. Inc.
    Inventor: James N. Ziemer
  • Patent number: 5743334
    Abstract: A method is provided for evaluating the quality of a hydraulic fracture treatment performed in a completed wellbore penetrating a subterranean hydrocarbon-bearing formation. The method is initiated by creating a pressure differential or utilizing an existing pressure differential between the wellbore and the formation and placing a lower packer and an upper packer in the wellbore. The lower and upper packers are positioned in the wellbore at or near the bottom of the producing interval to enclose one or more lower perforations within a wellbore chamber sealed to the remainder of the wellbore. Pressure values of the wellbore chamber are measured for a predetermined time period and then the lower and upper packers are repositioned to enclose the next one or more perforations in sequence within a new wellbore chamber. This procedure is repeated until pressure values have been measured in all wellbore chambers enclosing perforations of interest.
    Type: Grant
    Filed: April 4, 1996
    Date of Patent: April 28, 1998
    Assignee: Chevron U.S.A. Inc.
    Inventor: Donald G. Nelson