Patents Examined by Asok Pal
  • Patent number: 5605989
    Abstract: A process for the polymerization of at least one olefin in the presence of an activated catalyst, includes (a) providing an activated catalyst by a method including (1) mixing, in the absence of a solvent, at least one chromium salt with a support composition comprised of at least one compound (A) which is an inorganic, oxygen containing compound of at least one element selected from the group consisting of Group IVb, IIIa and IVa, and at least one compound (B) which is an inorganic compound containing at least one element selected from the group consisting of Group IVb and IIIa, the at least one compound (B) being different from the at least one compound (A), to provide a mixture; (2) preactivating the mixture by heating for a period ranging from 0.5 to 18 hours without calcining in an oxidizing atmosphere to a temperature ranging from at least C. above room temperature to a temperature which is lower than the decomposition temperature of the at least one chromium salt and which is C.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: February 25, 1997
    Assignee: Solvay (Soci et e Anonyme)
    Inventor: Beno it Koch
  • Patent number: 5603913
    Abstract: A solid, porous catalyst for the selective oxidation of hydrogen sulfide to sulfur has the atomic proportions covered by the formula Fe.sub.A Mg.sub.B Zn.sub.C Cr.sub.D wherein A has a value of 0.5 to 10, B has a value of 0.1 to 1, C has a value of 0 to 1, and D has a value of 0 to 1, where B+C=1. The catalyst is used by passing a gas stream comprising hydrogen sulfide and oxygen over the catalyst at a temperature above the dew point of sulfur and up to no more than C.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: February 18, 1997
    Assignee: Azerbaidzhanskaya Gosudarstvennaya Neftianaya Academiya
    Inventors: Tofik G. O. Alkhazov, Roland E. Meissner, III
  • Patent number: 5601698
    Abstract: Provided is a process for catalytic reforming a hydrocarbon feedstock containing at least 20 ppbw sulfur. The process comprises passing the hydrocarbon feedstock through at least two serialy connected reforming zones, with each zone containing a highly sulfur sensitive reforming catalyst. The catalyst in the first reforming zone is more frequently regenerated than the catalyst in the second reforming zone. The result is a highly efficient and simplified process for reforming a sulfur contaminated hydrocarbon feedstock. The process basically employs a minor portion of the highly sulfur sensitive reforming catalyst as both the reforming catalyst and a sulfur removal agent.
    Type: Grant
    Filed: November 14, 1995
    Date of Patent: February 11, 1997
    Assignee: Chevron Chemical Company
    Inventor: Robert A. Innes
  • Patent number: 5600055
    Abstract: Immobilized Lewis Acid catalyst comprising polymer having at least one Lewis Acid immobilized within the structure therein, said polymer having monomer units represented by the structural formula: ##STR1## wherein a represents about 1 to about 99 mole %b represents about 0 to about 50 mole %c represents about 1 to about 99 mole %a+b+c is preferably about 100%; ##STR2## C is selected from the group consisting of: ##STR3## (III) combinations thereof. D is OH, halide, OR.sup.4, NH.sub.2, NHR.sup.3, OM', or OM";E is the residue of the reaction of at least one Lewis Acid with the D substituent of monomer unit B;R.sup.1 represents proton, C.sub.1 -C.sub.24 alkyl group, or C.sub.3 -C.sub.24 cycloalkyl;R.sup.2 represents C.sub.1 -C.sub.24 alkyl group, C.sub.3 -C.sub.24 cycloalkyl, C.sub.6 -C.sub.18 aryl, or C.sub.7 -C.sub.30 alkylaryl;R.sup.3 represents C.sub.1 -C.sub.24 alkyl, C.sub.3 -C.sub.24 cycloalkyl, C.sub.1 -C.sub.24 aryl, or C.sub.7 -C.sub.30 alkylaryl;R.sup.4 represents C.sub.1 -C.sub.24 alkyl, C.sub.3 -C.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: February 4, 1997
    Assignee: Exxon Chemical Patents Inc
    Inventors: Tze-Chiang Chung, Frank J.-Y. Chen, Jon E. Stanat, Alok Kumar
  • Patent number: 5600046
    Abstract: This invention deals with a process for converting aliphatic C.sub.2 -C.sub.6 hydrocarbons into C.sub.6.sup.+ aromatics and C.sub.3.sup.= /C.sub.4.sup.= olefins. The process involves combining dehydrocyclodimerization (DHCD) with dehydrogenation. Thus, the feedstream is first sent to a DHCD zone which produces an effluent stream which contains C.sub.6.sup.+ aromatics along with C.sub.1 -C.sub.5 hydrocarbons. This effluent stream is separated into a stream containing C.sub.1 -C.sub.4 hydrocarbons and one containing C.sub.6.sup.+ aromatics. The C.sub.1 -C.sub.4 containing stream is flowed to a dehydrogenation zone to produce C.sub.3.sup.= /C.sub.4.sup.= olefins.
    Type: Grant
    Filed: December 2, 1994
    Date of Patent: February 4, 1997
    Assignee: UOP
    Inventors: Christopher D. Gosling, Joseph H. Gregor, Charles P. Luebke
  • Patent number: 5599584
    Abstract: A microminiature combustible gas sensor and a method of fabricating a microminiature combustible gas sensor are provided in which the catalytically active detector comprises a high surface area refractory catalyst support. A microminiature combustible gas sensor is also provided which comprises a catalytically active detector and a diffusion/flow restrictor for limiting the amount of combustion fuel reaching the catalytically active detector. The restrictor causes the catalytic reaction occurring in the vicinity of the catalytically active detector element to become substantially diffusion limited and reduces the power requirements of the sensor. The restrictor also reduces convective heat losses which may arise because of the large temperature gradient surrounding the catalytically active detector element. Finally, a microminiature combustible gas sensor comprising a flashback arrestor with one or more generally linear capillaries for preventing flashback is provided.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: February 4, 1997
    Assignee: Mine Safety Appliances Company
    Inventor: Richard E. Champney, Jr.
  • Patent number: 5600028
    Abstract: A ruthenium-based hydrogenation catalyst, particularly but not exclusively for hydrogenolysis under pressure of higher polyhydric alcohols, comprises ruthenium supported on granular activated carbon, and has:a specific surface area of from 600 to 1000 m.sup.2 /g;a total pore volume of from 0.5 to 1.2 cm.sup.3 /g;an apparent specific weight (bulk density) of from 0.45 to 0.55 g/cm.sup.3 ;an actual specific weight of from 1.9 to 2.3 g/cm.sup.3 ;a total volume of micropores having a radius smaller than 75 A of from 0.4 to 0.55 cm.sup.3 /g; andan ash content of from 2 to 5% by weight.The catalyst is used in a method for the continuous production of lower polyhydric alcohols in a fixed bed reactor, by means of hydrogenolysis under pressure of higher polyhydric alcohols.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: February 4, 1997
    Assignees: Montecatini Technologie S.r.l., Novamont S.p.A.
    Inventors: Giuseppe Gubitosa, Bruno Casale
  • Patent number: 5599440
    Abstract: 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: Grant
    Filed: June 30, 1995
    Date of Patent: February 4, 1997
    Assignee: Chevron U.S.A. Inc.
    Inventors: Bruce E. Stangeland, David C. Kramer, David S. Smith, James T. McCall, Georgieanna L. Scheuerman, Robert W. Bachtel, David R. Johnson
  • Patent number: 5600045
    Abstract: A process for conversion of crude hydrocarbon mixtures comprising tertiary olefins and gum-forming constituents with an alcohol in the presence of hydrogen, which process comprises contacting the crude hydrocarbon mixture, the alcohol, and hydrogen with a catalyst comprising an acidic molecular sieve containing an active hydrogenation metal component, as well as a stabilized crude hydrocarbon mixture containing alkyl tertiary alkyl ethers. A process for conversion of a tertiary olefin which contains one or more additional ethylenically or acetylenically unsaturated bonds.
    Type: Grant
    Filed: December 2, 1993
    Date of Patent: February 4, 1997
    Assignee: The Dow Chemical Company
    Inventors: Matheus J. Van Der Aalst, Levien J. Everaert, Juan M. Garces
  • Patent number: 5599764
    Abstract: The present invention relates to an adsorbent formed by the pyrolysis of a hydrophobic silica with a pore size greater than 5 .ANG., such as SILICALITE.TM., with a molecular sieving polymer precursor such as polyfurfuryl alcohol, polyacrylonitrile, polyvinylidene chloride, phenol-formaldehyde resin, polyvinylidene difluoride and mixtures thereof. Polyfurfuryl alcohol is the most preferred. The adsorbent produced by the pyrolysis has a silicon to carbon mole ratio of between about 10:1 and 1:3, and preferably about 2:1 to 1:2, most preferably 1:1. The pyrolysis is performed as a ramped temperature program between about and C., and preferably between about and C.The present invention also relates to a method for selectively adsorbing organic molecules having a molecular size (mean molecular diameter) of between about 3 and 6 .ANG.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: February 4, 1997
    Assignee: California Institute of Technology
    Inventors: Pramod K. Sharma, Gregory S. Hickey
  • Patent number: 5600052
    Abstract: A reactor arrangement and process for indirectly contacting a reactant stream with a heat exchange stream uses an arrangement of heat exchange plates to control temperature conditions by varying the heat transfer factor in different portions of a continuous channel defined by the heat exchange plates. The reactor arrangement and process of this invention may be used to operate a reactor under isothermal or other controlled temperature conditions. The variation in the heat transfer factor within a single heat exchange section is highly useful in maintaining a desired temperature profile in an arrangement having a cross-flow of heat exchange medium relative to reactants. The corrugations arrangement eliminates or minimizes the typical step-wise approach to isothermal conditions.
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: February 4, 1997
    Assignee: UOP
    Inventors: Christine J. B. Girod, William W. Levy, Peter R. Pujado, Jacques J. L. Romatier, Dominique J. J. M. Sabin, Paul A. Sechrist
  • Patent number: 5600049
    Abstract: In the alkylation of benzene with propylene in a distillation column reactor to produce cumene the overheads from the distillation reactor are fed to a depropanizer where the unreacted benzene is separated from C.sub.3 's. Liquid propylene feed for the distillation column reactor is vaporized by indirect heat exchange with the overheads from the depropanizer to condense the overheads, thereby reducing the pressure in the depropanizer below what would be normally achieved with conventional condensing systems.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: February 4, 1997
    Assignee: Chemical Research & Licensing Company
    Inventor: Angel Sy
  • Patent number: 5600011
    Abstract: Disclosed are a novel hafnium compound represented by the formula Hf(OSO.sub.2 CF.sub.3).sub.4 and a process using a hafnium compound represented by the formula Hf(OSO.sub.2 CF.sub.3).sub.4 as a catalyst in a Friedel-Crafts reaction.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: February 4, 1997
    Assignee: Daicel Chemical Industries, Ltd.
    Inventor: Shu Kobayashi
  • Patent number: 5597537
    Abstract: An FCC process mixes spent and regenerated catalyst to obtain thermal equilibrium of a blended catalyst stream before contacting feed with the blended catalyst stream. The spent and regenerated catalyst from the reactor and regenerator catalyst may be mixed in a blending vessel located at the bottom of an FCC riser that can also serve as a hot catalyst stripper.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: January 28, 1997
    Assignee: UOP
    Inventors: David A. Wegerer, David A. Lomas
  • Patent number: 5597773
    Abstract: This invention relates to ethylene oxide catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen prepared by impregnating a porous, refractory support having a surface area ranging from about 0.05 to about 10 m.sup.2 /g with a solubilized catalytically effective amount of silver, a solubilized promoting amount of alkali metal, a solubilized promoting amount of rhenium, and a solubilized promoting amount of hafnium metal, wherein the Group IVB metal is provided in the form of Group IVB oxycation-containing salts. The catalyst provide substantial initial activity improvement as well as long term selectivity and activity stability improvement over prior art rhenium promoted catalyst, without any loss of initial selectivity advantage.
    Type: Grant
    Filed: December 29, 1994
    Date of Patent: January 28, 1997
    Assignee: Shell Oil Company
    Inventors: Wayne E. Evans, Carolus M. A. M. Mesters
  • Patent number: 5597474
    Abstract: The present invention relates to an integrated fluid coking/hydrogen production process. The fluid coking unit is comprised of a fluid coker reactor, a heater, and a gasifier. Solids from the fluidized beds are recycled between the coking zone and the heater and between the heater and the gasifier. A separate stream of hot solids from the gasifier is passed to the scrubbing zone of the reactor. Methane and steam are introduced into the stream of hot solids passing from the gasifier to the scrubbing zone. The hot particles act to catalyze the conversion of methane to carbon monoxide and hydrogen in the presence of steam.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: January 28, 1997
    Assignee: Exxon Research & Engineering Co.
    Inventors: Michael C. Kerby, Roby Bearden, Jr., Stephen M. Davis, LeRoy Clavenna
  • Patent number: 5597771
    Abstract: The present invention relates to a layered catalyst composite of the type generally referred to as a three-way conversion catalyst having the capability of substantially simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides. The structure of the layered catalyst composite of the present invention is designed wherein there is a first layer and a second layer. The first layer comprises a first support; at least one first palladium component and an oxygen storage component in intimate contact with the palladium component; optionally another first platinum group metal component; a zirconium component; at least one first alkaline earth metal components and at least one first rare earth metal component selected from the group consisting of lanthanum metal components and neodymium metal components.
    Type: Grant
    Filed: June 24, 1994
    Date of Patent: January 28, 1997
    Assignee: Engelhard Corporation
    Inventors: Zhicheng Hu, Chung-Zong Wan, Yiu-Kwan Lui, Joseph C. Dettling
  • Patent number: 5596130
    Abstract: Methods and compositions are provided for cleaning and inhibiting the formation of fouling deposits on jet engine components during the combustion of turbine combustion fuel oils. Methods and compositions are also provided for inhibiting the formation and emission of soot and smoke from jet engine exhaust during turbine combustion fuel oil combustion. The methods employ a derivative of (thio)phosphonic acid added to the turbine combustion fuel oil. The preferred derivative is pentaerythritol ester of polyisobutenylthiophosphonic acid.
    Type: Grant
    Filed: October 25, 1995
    Date of Patent: January 21, 1997
    Assignee: Betz Laboratories, Inc.
    Inventors: Bruce E. Wright, William L. Witzig, Alan E. Goliaszewski, William S. Carey, Jeffrey H. Peltier
  • 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: 5593934
    Abstract: Disclosed is a platinum alloy catalyst comprising a carbon support and, platinum, manganese and iron supported thereon. The activities of this platinum alloy catalyst are higher than those of a binary alloy catalyst consisting of platinum and manganese and even of a platinum-nickel-cobalt alloy catalyst which is one of the most active conventional platinum alloy catalysts, and its life is greatly extended. Moreover, it is quite useful when utilized as an electrocatalyst of a fuel cell.
    Type: Grant
    Filed: December 7, 1994
    Date of Patent: January 14, 1997
    Assignees: Tanaka Kikinzoku Kogyo K.K., Stonehart Associates Inc.
    Inventor: Paul Stonehart