Patents Examined by William G. Wright
  • Patent number: 6702994
    Abstract: The present invention relates to a method for production of amorphous silica from particulate materials containing at least 50% elemental silicon, where the silicon-containing material is supplied to a combustion reactor which is heated by an oil- or gas burner and where amorphous silica is recovered after the outlet from the combustion reactor. At least a part of the particulate silicon containing materials are supplied to the combustion reactor in the form of an aqueous slurry. The invention further relates to an apparatus for production of amorphous silica.
    Type: Grant
    Filed: September 7, 2001
    Date of Patent: March 9, 2004
    Assignee: Elkem ASA
    Inventors: Knut Henriksen, Olaf Trygve Vegge
  • Patent number: 6677466
    Abstract: The invention relates to the use of one or more &agr;-keto carboxylic acid esters and/or aldehyde carboxylic acid esters for stabilizing hydrogen peroxide during enzyme-catalyzed or metal-catalyzed oxidation reactions in organic synthesis, as well as for stabilizing hydrogen peroxide or aqueous or organic hydrogen peroxide solutions during production, storage and transport.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: January 13, 2004
    Assignee: DSM Fine Chemicals Austria NFG GmbH & Co KG
    Inventor: Paulus Lambertus Alsters
  • Patent number: 6676712
    Abstract: A process for the concentration of aqueous hydrogen peroxide by discontinuous crystallization. A cooling surface is arranged in a crystallizing vessel and first wetted with hydrogen peroxide and then cooled at a high cooling rate, whereupon seed crystals form. The cooling rate is at least 1 K/s, preferably from 10 to 30 K/s. When the vessel has been filled with H2O2 starting material, the latter crystallizes, starting from the seed crystals, and forms a crystal layer. When the mother liquor of lower H2O2 concentration has been discharged, there follows a sweating operation with a slow increase in temperature, as a result of which the H2O2 concentration in the crystal layer is increased further.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: January 13, 2004
    Assignee: Degussa AG
    Inventors: Matthias Creutz, Stefan Nordhoff, Rudolf Wagner, Jürgen Glenneberg, Dieter Möller
  • Patent number: 6667271
    Abstract: Hydrotreating catalyst containing one or more metal oxides and/or sulphides selected from Group VI-B and Group VIII of the Periodic Table supported on a porous refractory carrier, wherein the catalyst being in form of an angular extrudate with rounded edges.
    Type: Grant
    Filed: August 23, 2001
    Date of Patent: December 23, 2003
    Assignee: Haldor Topsoe A/S
    Inventor: Jesper Bartholdy
  • Patent number: 6664206
    Abstract: This invention provides a method of reactivating a catalyst for methacrylic acid production, which catalyst is used in production of methacrylic acid through vapor-phase oxidation of methacrolein or vapor-phase oxidative dehydrogenation of isobutyric acid, contains P and Mo, and exhibits reduced activity. The process comprises treating the catalyst, whose activity level has dropped (deteriorated catalyst), with a gas containing a nitrogen-containing heterocyclic compound (e.g., pyridine, piperidine, piperazine, quinoline).
    Type: Grant
    Filed: September 21, 2001
    Date of Patent: December 16, 2003
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Hiroto Kasuga, Eiichi Shiraishi
  • Patent number: 6664207
    Abstract: A catalyst and process for converting carbon dioxide into oxygenates. The catalyst comprises copper, zinc, aluminum, gallium, and a solid acid.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: December 16, 2003
    Assignee: Conocophillips Company
    Inventors: Jianhua Yao, James B. Kimble
  • Patent number: 6660683
    Abstract: Compositions for reduction of gas phase reduced nitrogen species and NOx generated during a partial or incomplete combustion catalytic cracking process, preferably, a fluid catalytic cracking process, are disclosed. The compositions comprise (i) an acidic metal oxide containing substantially no zeolite, (ii) an alkali metal, alkaline earth metal, and mixtures thereof, (iii) an oxygen storage component, and (iv) a noble metal component, preferably rhodium or iridium, and mixtures thereof, are disclosed. Preferably, the compositions are used as separate additives particles circulated along with the circulating FCC catalyst inventory. Reduced emissions of gas phase reduced nitrogen species and NOx in an effluent off gas of a partial or incomplete combustion FCC regenerator provide for an overall NOx reduction as the effluent gas stream is passed from the FCC regenerator to a CO boiler, whereby as CO is oxidized to CO2 a lesser amount of the reduced nitrogen species is oxidized to NOx.
    Type: Grant
    Filed: October 21, 2002
    Date of Patent: December 9, 2003
    Assignee: W.R. Grace & Co.-Conn.
    Inventors: George Yaluris, John Allen Rudesill
  • Patent number: 4846963
    Abstract: A coal liquefaction process using ionic liquefaction techniques with polar solvent solubilizing agents and water soluble inorganic compounds, produces a carbonaceous liquefaction product which is separated from the process stream by the use of methanol as a partitioning agent and the methanol and solubilizing agent are recovered separately for reuse.
    Type: Grant
    Filed: April 18, 1986
    Date of Patent: July 11, 1989
    Inventors: Curtis L. Knudson, John R. Rindt, Sylvia A. Farnum
  • Patent number: 4835127
    Abstract: A paraffin or mixture of paraffins having from 2 to 5 carbon atoms is oxidatively dehydrogenated in the presence of a cobalt based catalyst composition which has been calcined in the absence of oxygen. The catalyst composition comprises cobalt; phosphorus; at least one promoter selected from the group consisting of zinc, titanium, zirconium, niobium, indium, lead and bismuth; at least one alkali metal and oxygen. The catalyst composition may also contain sulfur and/or a halogen. If the feed to the oxidative dehydrogenation process contains paraffins having more than two carbon atoms, some cracking of such paraffins will also occur at the conditions at which the oxidative dehydrogenation process is carried out.
    Type: Grant
    Filed: October 9, 1984
    Date of Patent: May 30, 1989
    Assignee: Phillips Petroleum Company
    Inventors: Alan D. Eastman, Jack P. Guillory, Charles F. Cook, James B. Kimble
  • Patent number: 4818746
    Abstract: A metal catalyst carrier or support body is rolled or laminated from two alternating layers of sheet metal of different structure, wherein the sheet-metal layer, at least in some areas relative to one another, have double or multiple-wave structure, in that one of the layers has a wave structure including at least two superimposed or alternating waves of different wavelength and/or amplitude and/or both layers have wave structures of different wavelength and/or amplitude, by means of which in both cases the number of contact points between the two layers is reduced and the elasticity of the resultant structure is increased, wherein none of the wavelengths is considerably smaller than the wavelenth having the greatest amplitude.
    Type: Grant
    Filed: September 29, 1986
    Date of Patent: April 4, 1989
    Assignee: Interatom GmbH
    Inventor: Theodor Cyron
  • Patent number: 4816434
    Abstract: Catalytic materials are modified by adding one or more electropositive and/or electronegative elements thereto in amounts sufficient to adjust the resultant geometric mean electronegativity to a value within a desired or predetermined range. The invention is particularly suited to the preparation of hydrocarbon hydroprocessing catalysts, particularly with respect to hydrodesulfurization catalysts comprising a support material containing a porous refractory oxide. With such catalysts, not only is the geometric mean electronegativity adjusted to a desired value, but if the electropositive or electronegative element added to the catalyst has pore growth promotion properties, the average pore size of the resultant catalyst is increased while its surface area, and usually also its total pore volume, is decreased.
    Type: Grant
    Filed: February 19, 1982
    Date of Patent: March 28, 1989
    Assignee: Union Oil Company of California
    Inventor: Howard D. Simpson
  • Patent number: 4801569
    Abstract: A novel system for the preparation of maleic anhydride by catalytic oxidation of a hydrocarbon such as butane wherein the catalyst system comprising a mixture of (1) a mixed vanadium-phosphate catalyst and (2) a noncatalytic material comprising an oxide of a Group IA-IIIA element, Pb, In, Sb, Sn, Tl, Bi or mixtures thereof.
    Type: Grant
    Filed: October 30, 1985
    Date of Patent: January 31, 1989
    Assignee: The Standard Oil Company
    Inventors: Michael J. Desmond, Marc A. Pepera
  • Patent number: 4795730
    Abstract: An improved process for dehydrating alcohols in which the catalyst used in the dehydration process is activated using an organic carboxylic acid.
    Type: Grant
    Filed: January 29, 1986
    Date of Patent: January 3, 1989
    Assignee: Phillips Petroleum Company
    Inventor: Charles A. Drake
  • Patent number: 4784981
    Abstract: The invention relates to a vanadium/phosphorus mixed oxide catalyst, a process for its preparation and its use for the preparation of maleic anhydride.The catalyst according to the invention is prepared by reacting a vanadium(V) compound with phosphoric acid and/or a compound forming phosphoric acid with heating, optionally in the presence of water, and subsequently treating the product obtained after the reaction with organic solvents and/or diluents having reducing activity, optionally in the presence of a promoter, at an elevated temperature.
    Type: Grant
    Filed: July 19, 1982
    Date of Patent: November 15, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinz-Jurgen Alpers, Karl-Heinz Heller, Gunther Lenz
  • Patent number: 4780444
    Abstract: There is provided a method for activating preformed, crystalline aluminum phosphates by combining these aluminum phosphates with an activating metal oxide, such as silica, and water under conditions, such as mulling, sufficient to increase the acid catalytic activity of the material.
    Type: Grant
    Filed: May 3, 1984
    Date of Patent: October 25, 1988
    Assignee: Mobil Oil Corporation
    Inventors: Eric G. Derouane, Emmerson Bowes
  • Patent number: 4780448
    Abstract: A catalyst containing copper and silica is prepared by a process in which an aqueous alkali metal silicate solution containing from 1 to 26% by weight of SiO.sub.2 is brought to a pH of from 0.5 to 2.0 with nitric acid, an aqueous copper nitrate solution containing from 5 to 15% by weight of Cu is added, after the addition of the nitric acid, so that a clear solution containing from 0.18 to 3.0 moles of Cu per mole of SiO.sub.2 is formed, the resulting solution is mixed with an aqueous alkali metal carbonate solution at from to C., the pH of the mixture being kept at from 7.5 to 8.5, and the precipitated material is separated off, dried, calcined by heating at from to C. and pressed in a conventional manner to give catalyst moldings. The catalyst thus obtained is used for the hydrogenation of dialkyl dicarboxylates to diols.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: October 25, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz J. Broecker, Rolf Fischer, Klaus-Dieter Malsch, Wolfgang Reiss, Rolf Schnabel, Hans-Martin Weitz
  • Patent number: 4778585
    Abstract: Increased yields of liquid hydrocarbon are obtained from a carbonaceous material (e.g., coal) by a two-stage process comprising pretreatment of the carbonaceous material with an appropriate gas in a first stage, followed by pyrolysis of the pretreated carbonaceous material, in a second stage.
    Type: Grant
    Filed: March 18, 1986
    Date of Patent: October 18, 1988
    Assignee: Research Foundation of the City Univ. of NY
    Inventor: Robert A. Graff
  • Patent number: 4776949
    Abstract: Froth, produced by induced air flotation in the hot water process circuit for extracting bitumen from tar sand, is recycled and added to the fresh slurry being introduced to the primary separation vessel. An increase in bitumen recovered as primary froth from the circuit is produced.
    Type: Grant
    Filed: December 5, 1985
    Date of Patent: October 11, 1988
    Assignees: Alberta Energy Company Ltd., Canadian Occidental Petroleum Ltd., Esso Resources Canada Limited, Gulf Canada Limited, Her Majesty the Queen in right of Canada, as represented by The Minister of Natural Resources, Hbog-Oil Sands Limited Partnership, Pancanadian Petroleum Limited, Petro-Canada Inc.
    Inventors: Antony H. S. Leung, Teddy K. Kwong
  • Patent number: 4776892
    Abstract: Light-hardened photoresist layers are stripped by treating the layer with an aqueous solution of an organic quaternary ammonium base and, optionally a strong inorganic base. The resulting layer residues are dispersed as relatively small flakes which do not become lodged between conducting paths.
    Type: Grant
    Filed: August 22, 1986
    Date of Patent: October 11, 1988
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Steppan, Ulrich Geissler
  • Patent number: 4772579
    Abstract: Catalyst precursor units, e.g. for ammonia synthesis catalysts, comprise an iron oxide composition in the form of sintered shaped units of substantially uniform cross section having a plurality, e.g. 13 to 50 or more, through passages of substantially uniform cross section. The passages preferably have a diameter of less than 1.5, particularly less than 0.7, mm.
    Type: Grant
    Filed: October 28, 1986
    Date of Patent: September 20, 1988
    Assignee: Imperial Chemical Industries PLC
    Inventors: Terence Thistlethwaite, Johan H. H. ter Maat, Peter J. Davidson