Patents Represented by Attorney, Agent or Law Firm A. W. Klaassen
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Patent number: 5589057Abstract: This invention makes possible substantially continuous flow of uniformly distributed hydrogen and hydrocarbon liquid across a densely packed catalyst bed to fill substantially the entire volume of a reactor vessel by introducing the fluids as alternate annular rings of gas and liquid (i.e. a mixture of liquid hydrocarbon and a hydrogen-containing gas) at a rate insufficient to levitate or ebullate the catalyst bed. Catalyst are selected by density, shape and size at a design feed rate of liquids and gas to prevent ebullation of the packed bed at the design feed rates. The liquid and gas components of the hydrocarbon feed flow into the catalyst bed from concentric annular rings that are coaxial with the catalyst bed. At the desired hydrocarbon flow rate, such catalyst bed continually flows in a plug-like manner downwardly through the reactor vessel. Catalyst is removed on a periodic or semicontinuous basis by laminarly flowing catalyst particles in a liquid stream out of the bottom of the catalyst bed.Type: GrantFiled: November 21, 1994Date of Patent: December 31, 1996Assignee: Chevron U.S.A. Inc.Inventors: Harold J. Trimble, Brian A. Darsow
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Patent number: 5565181Abstract: The NOx content of FCC regenerator flue gas is reduced using a spinel/perovskite additive which maintains activity during FCC operation in the presence of high levels of sulfur oxides and oxygen. Additionally, a stabilization component may be added to enhance catalytic stability of the additive, and a cracking component may be added under conditions of low reducing agents in the regenerator flue gas.Type: GrantFiled: October 21, 1994Date of Patent: October 15, 1996Assignee: Chevron U.S.A. Inc.Inventors: Gunther H. Dieckmann, Elena Q. Labrador
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Patent number: 5558851Abstract: A method is disclosed for preparing a crystalline aluminosilicate zeolite from a reaction mixture containing only sufficient water so that the reaction mixture may be shaped if desired. In the method, the reaction mixture is heated at crystallization conditions and in the absence of an external liquid phase, so that excess liquid need not be removed from the crystallized material prior to drying the crystals.Type: GrantFiled: September 20, 1994Date of Patent: September 24, 1996Assignee: Chevron U.S.A. Inc.Inventor: Stephen J. Miller
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Patent number: 5552132Abstract: An aluminophosphate-type molecular sieve is prepared using a templating agent derived for an organosulfonium cation of the form S.sup.+ (R).sub.3, wherein each R is independently selected from alkyl, aryl and alkylaryl.Type: GrantFiled: October 28, 1994Date of Patent: September 3, 1996Assignee: Chevron U.S.A. Inc.Inventor: Susan T. Evans
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Patent number: 5543035Abstract: A process is provided for producing a high quality lubricating oil base stock with a catalyst having a high viscosity index selectivity and low fouling rate. The catalyst contains a low amount of zeolite, and has a pore size distribution characterized by a significant amount of large pores.Type: GrantFiled: August 1, 1994Date of Patent: August 6, 1996Assignee: Chevron U.S.A. Inc.Inventor: James N. Ziemer
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Patent number: 5527512Abstract: A light-weight and easily manufacturable catalyst support structure is provided, which allows fluid flow into a catalyst bed in uniform distribution. The support structure, used for supporting a moving catalyst bed within a moving bed reactor having an upward flowing fluid phase, is formed in a cone-like shape in which the diameter enlarges upward. The supporting structure comprises a shell-like support member, a first mesh layer comprising thick mesh elements, and a second mesh layer having a mesh size which does not allow catalyst particles to pass through. The first mesh layer overlays the support member, and the second mesh layer overlays the first mesh layer. The shell-like support member includes a circular bottom plate extending perpendicular to the center line of the reactor, and a side wall having a truncated cone shape which extends upward from the edge of the bottom plate. The bottom plate and the side wall are primarily made of perforated plates through which the fluid passes.Type: GrantFiled: June 17, 1994Date of Patent: June 18, 1996Assignee: Chevron U.S.A. Inc.Inventors: Robert W. Bachtel, Yoshitomo Ohara, Toshio Ishizuka, Tsunehiko Hiraga
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Patent number: 5498327Abstract: This invention makes possible substantially continuous flow of uniformly distributed hydrogen and hydrocarbon liquid across a densely packed catalyst bed to fill substantially the entire volume of a reactor vessel by introducing the fluids as alternate annular rings of gas and liquid (i.e. a mixture of liquid hydrocarbon and a hydrogen-containing gas) at a rate insufficient to levitate or ebullate the catalyst bed. Catalyst are selected by density, shape and size at a design feed rate of liquids and gas to prevent ebullation of the packed bed at the design feed rates. Catalysts are selected by measuring bed expansion, such as in a large pilot plant run, with hydrocarbon, hydrogen, and catalyst at the design pressures and flow velocities. The liquid and gas components of the feed flow into the bed in alternate annular rings across the full area of the bed.Type: GrantFiled: June 6, 1995Date of Patent: March 12, 1996Inventors: Bruce E. Stangeland, David C. Kramer, David S. Smith, James T. McCall, Georgieanne L. Scheuerman, Robert W. Bachtel, David R. Johnson
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Patent number: 5492617Abstract: This invention makes possible substantially continuous flow of uniformly distributed hydrogen and hydrocarbon liquid across a densely packed catalyst bed which substantially fills the entire volume of a reactor vessel. Catalyst are selected to be essentially the same density, shape and size at a design feed rate of liquids and gas to prevent ebullation of the packed catalyst bed at the design feed rates. The liquid and gas components of the hydrocarbon feed stream flow into the bed of catalyst and a quenching medium, which is preferably a liquid, is injected into the bed of catalyst. Injection of a liquid quench reduces the gas component of the hydrocarbon feed stream while simultaneously increasing the residence time and reducing the liquid velocity of the liquid component of the hydrocarbon feed stream within the substantially packed bed of catalyst.Type: GrantFiled: July 11, 1994Date of Patent: February 20, 1996Inventors: Harold J. Trimble, Bruce E. Reynolds, Robert W. Bachtel, Robert J. Klett, David N. Brossard, David E. Earls
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Patent number: 5484755Abstract: High activity slurry catalysts for hydroprocessing heavy hydrocarbon oils are produced from Group VIB metal compounds by sulfiding an aqueous mixture of the metal compound with from greater than about 8 to about 14 SCF of hydrogen sulfide per pound of Group VIB metal.Type: GrantFiled: August 22, 1994Date of Patent: January 16, 1996Inventor: Jaime Lopez
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Patent number: 5472928Abstract: This invention makes possible substantially continuous flow of uniformly distributed hydrogen and hydrocarbon liquid across a densely packed catalyst bed to fill substantially the entire volume of a reactor vessel by introducing the fluids as alternate annular rings of gas and liquid at a rate insufficient to levitate the catalyst bed. Catalyst are selected by density, shape and size at a design feed rate of liquids and gas to prevent ebullation of the packed bed at the design feed rates. Catalysts are selected by measuring bed expansion with hydrocarbon, hydrogen, and catalyst at the design pressures and flow velocities. The liquid and gas components of the feed flow into the bed in alternate annular rings across the full area of the bed. At the desired flow rate, such catalyst continually flows in a plug-like manner downwardly through the reactor vessel by introducing fresh catalyst at the top of the catalyst bed by laminarly flowing such catalyst in a liquid stream on a periodic or semicontinuous basis.Type: GrantFiled: April 29, 1994Date of Patent: December 5, 1995Inventors: Georgieanna L. Scheuerman, David R. Johnson, David C. Kramer
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Patent number: 5453176Abstract: A process is disclosed for producing an isoparaffin white oil by contacting a refinery stream, in the presence of hydrogen, with a catalyst comprising an intermediate pore size silicoaluminophosphate molecular sieve and a hydrogenation component to form a dewaxed oil product. The dewaxed oil product is then contacted with a hydrogenation catalyst to produce a hydrogenated oil product which is then treated to remove aromatics to produce an isoparaffin white oil.Type: GrantFiled: October 13, 1993Date of Patent: September 26, 1995Inventors: Bruce A. Narloch, Michael A. Shippey, Malcolm W. Wilson
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Patent number: 5451140Abstract: A process is provided for controlling volatile organic compound emissions from rotating and reciprocating mechanical equipment. The process comprises a vapor flow, a combustion, and a flow control for preventing combustion of the volatile organic compound within the system.Type: GrantFiled: July 15, 1994Date of Patent: September 19, 1995Assignee: Chevron U.S.A. Inc.Inventors: Cortland Johnsen, Jr., John S. Angen, Douglas R. McCay, Timothy J. Sutherland, Arthur D. Mares, John F. Lizarraga, Tonny W. Eilertson, Steve A. Nicholas
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Patent number: 5376260Abstract: Heavy waxy oil is dewaxed by a mild cracking and isomerization process using a catalyst comprising SSZ-32 and at least one Group VIII metal. The heavy oil contains naphthenic wax, which includes only a relatively small amount of normal alkanes. Naphthenic wax containing a minor amount of oil may also be dewaxed using the process.Type: GrantFiled: April 5, 1993Date of Patent: December 27, 1994Assignee: Chevron Research and Technology CompanyInventors: Donald S. Santilli, Stacey I. Zones
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Patent number: 5364517Abstract: The NOx content of FCC regenerator flue gas is reduced using a spinel/perovskite additive which maintains activity during FCC operation in the presence of high levels of sulfur oxides and oxygen. Additionally, a stabilization component may be added to enhance catalytic stability of the additive, and a cracking component may be added under conditions of low reducing agents in the regenerator flue gas.Type: GrantFiled: February 19, 1993Date of Patent: November 15, 1994Assignee: Chevron Research and Technology CompanyInventors: Gunther H. Dieckmann, Elena Q. Labrador
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Patent number: 5344313Abstract: A system is provided for controlling volatile organic compound emissions from rotating and reciprocating mechanical equipment. The system comprises a vapor flow, a combustor, and a device for preventing combustion of the volatile organic compound within the system.Type: GrantFiled: April 30, 1993Date of Patent: September 6, 1994Assignee: Chevron Research and Technology CompanyInventor: Cortland W. Johnsen, Jr.
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Patent number: 5300210Abstract: 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: GrantFiled: June 7, 1993Date of Patent: April 5, 1994Assignee: Chevron Research and Technology CompanyInventors: Stacey I. Zones, James N. Ziemer, Donald S. Santilli, Robert A. Innes, Dennis L. Holtermann
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Patent number: 5298152Abstract: 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 steps of:1) separating at least a portion of active catalyst from the liquid hydrogenation product eluted from the hydrogenation zone of said hydroprocess, and2) recycling at least a portion of said separated active catalyst to said hydrogenation zone;wherein said steps are carried out while maintaining said active catalyst under conditions substantially the same as those encountered in said hydrogenation zone.Type: GrantFiled: June 2, 1992Date of Patent: March 29, 1994Assignee: Chevron Research and Technology CompanyInventor: David C. Kramer
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Patent number: 5294329Abstract: 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 steps of:(1) separating at least a portion of active catalyst from the liquid hydrogenation product eluted from the hydrogenation zone of said hydroprocess, and(2) recycling at least a portion of said separated active catalyst to said hydrogenation zone;wherein said steps are carried out while maintaining said active catalyst under conditions substantially the same as those encountered in said hydrogenation zone.Type: GrantFiled: June 2, 1992Date of Patent: March 15, 1994Assignee: Chevron Research and Technology CompanyInventor: David C. Kramer
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Patent number: 5281407Abstract: Molecular sieves, particularly zeolites, are prepared using templates derived from a 4-azonia-tricyclo[5.2.n.0.sup.2,6 ]alkene family of compounds. The templates may be prepared in a series of reaction steps which include a Diels-Alder reaction between a diene and a dienophile.Type: GrantFiled: June 30, 1992Date of Patent: January 25, 1994Assignee: Chevron Research and Technology CompanyInventor: Yumi Nakagawa
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Patent number: 5270018Abstract: Apparatus for withdrawing particulate spent catalyst particles from a packed, non-fluidized bed of such particles in contact with a liquid medium within a vessel wherein the apparatus is a withdrawal conduit or pipe which has an inlet that opens within the bottom of the bed and faces generally downwardly so that a first section extends upwardly from the inlet, and a second section extends downwardly, and the spent catalyst particles exits the packed bed through a uniform and continuous flow path opening into a solids recovery vessel whose pressure is controlled to regulate flow of such spent catalyst from the reaction vessel independent of the rate of flow through the withdrawal conduit.Type: GrantFiled: December 11, 1991Date of Patent: December 14, 1993Assignee: Chevron Research CompanyInventor: Georgieanna L. Scheuerman