Patents Examined by Asok Pal
  • Patent number: 5849967
    Abstract: Binderless zeolite L particles are prepared by a method in which particles are formed from silica and from 0 to 95 wt % preformed zeolite L crystallites, and the particles are thereafter reacted with an alkaline solution comprising a source of alumina to convert the silica binder to zeolite L. These particles may comprise cylindrical zeolite L crystallites with a mean diameter of at least 0.05 micron in a zeolite L matrix and may be used as catalyst. Also acyclic hydrocarbons are dehydrocyclized and/or isomerized by contacting them at a temperature of from 370.degree. C. to 600.degree. C. with this catalyst incorporating at least one Group VIII metal having dehydrogenating activity to convert at least part of the acyclic hydrocarbons into aromatic hydrocarbons.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 15, 1998
    Assignee: Exxon Chemical Patents Inc. (ECPI)
    Inventors: Johannes Petrus Verduijn, Pieter Ernst Gellings
  • Patent number: 5770539
    Abstract: Immobilized Lewis Acid catalyst comprising porous polymer film substrate having at least one Lewis Acid immobilized on pore surfaces thereof, said polymer film substrate prior to having said Lewis Acid immobilized thereon comprising a porous film of functionalized polymer and, optionally, unfunctionalized polymer, said functionalized polymer having within its structure units represented by the formula ##STR1## and said unfunctionalized polymer having within its structure repeating monomer units represented by the formula ##STR2## wherein D represents OH, halide, NH.sub.2, NHR.sup.3, OM', or OM";R.sup.1 represents hydrogen, C.sub.1 -C.sub.24 alkyl, C.sub.3 -C.sub.24 cycloalkyl, C.sub.6 -C.sub.18 aryl or C.sub.7 -C.sub.30 alkylaryl;R.sup.2 represents C.sub.3 -C.sub.24 alkyl, C.sub.3 -C.sub.24 cycloalkyl, C.sub.6 -C.sub.18 aryl or C.sub.7 -C.sub.30 alkaryl;R.sup.3 represents C.sub.1 -C.sub.24 alkyl, C.sub.3 -C.sub.24 cycloalkyl, C.sub.6 -C.sub.18 aryl or C.sub.7 -C.sub.
    Type: Grant
    Filed: January 18, 1996
    Date of Patent: June 23, 1998
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Frank Joung-Yei Chen, Tze-Chiang Chung, Jon Edmond Stanat, Soon Hong Lee
  • Patent number: 5723707
    Abstract: Disclosed are methods for dehydrogenation in reactor systems of improved resistance to carburization under dehydrogenation conditions.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: March 3, 1998
    Assignee: Chevron Chemical Company
    Inventors: John V. Heyse, Paul G. Johnson, Bernard F. Mulaskey
  • Patent number: 5665669
    Abstract: A metallic honeycomb body for supporting a catalyst comprises a flat plate and a corrugated plate; these plates are formed by a foil of stainless steel in which the steel contains more than 1% of Si and the surface of the steel is covered by a film which is mainly formed by an oxide chrome at a high temperature, and are mutually bonded by diffusion bonding.The chemical composition of the foil material is comprised of up to 0.2% of C, more than 1 to 5% of Si, 9 to 22% of Cr, up to 0.8% of Al, and as necessary, at least one member selected from the group of Nb, V, Mo W and REM (rare earth member) including Y.The metallic honeycomb body is formed by which said body is annealed at a vacuum degree of 10.sup.-2 to 10.sup.-4 Torr and in a temperature range of 1200.degree. to 1300.degree. C. for 1 to 30 minutes in a vacuum annealing furnace.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: September 9, 1997
    Assignee: Nippon Steel Corporation
    Inventors: Mikio Yamanaka, Masuhiro Fukaya, Nobuhiro Fujita, Yasushi Ishikawa, Toshikazu Nakagawa, Masao Yashiro, Hitoshi Ohta
  • Patent number: 5651829
    Abstract: The invention relates to a novel crystalline maltitol composition which essentially exhibits a porous and honeycombed structure and which possesses a very high degree of maltitol purity and a low density.This composition possesses outstanding functional properties, making its use particularly recommended for manufacturing tablets or various powders to be dissolved in water.The invention also relates to a novel process for enabling the crystalline maltitol composition to be manufactured.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 29, 1997
    Assignee: Roquette Freres
    Inventor: Jean-Jacques Caboche
  • Patent number: 5639928
    Abstract: The present invention relates to the improved liquid phase dehydration of 1-phenyl ethanol to styrene monomer, the improvement comprising the use of a residue formation inhibiting agent during the liquid phase dehydration.
    Type: Grant
    Filed: August 26, 1994
    Date of Patent: June 17, 1997
    Assignee: ARCO Chemical Technology, L.P.
    Inventors: Walter S. Dubner, Lawrence M. Candela
  • Patent number: 5626685
    Abstract: A method of removing a water insoluble surface coating from a surface comprising applying to the coating a liquid comprising between about 0.25 weight percent to about 99.9 weight percent of a fatty acid selected from the group consisting of unsaturated fatty acids, saturated fatty acids, polyunsaturated fatty acids and mixtures thereof, an organic or inorganic alkaline builder present in an amount effective to saponify the fatty acid and still maintain the constituents in solution, and the balance of the liquid is water.
    Type: Grant
    Filed: May 24, 1994
    Date of Patent: May 6, 1997
    Inventor: William E. Spindler
  • Patent number: 5625113
    Abstract: A process is disclosed for alkylating an isoparaffin with an olefin comprising the steps of:(a) reacting an isoparaffin having from 4 to 8 carbon atoms with an olefin having from 2 to 12 carbon atoms in a first alkylation reaction stage at temperature from about -40.degree. C. to about 500.degree. C. and overall isoparaffin:olefin feed weight ratio of from about 1:1 to about 250:1 with a solid alkylation catalyst comprising a synthetic porous crystalline material characterized by an X-ray diffraction pattern including values substantially as set forth in Table I of the specification and having a composition comprising the molar relationshipX.sub.2 O.sub.3 :(n)YO.sub.
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: April 29, 1997
    Assignee: Mobil Oil Corporation
    Inventors: Mohsen N. Harandi, James H. Beech, Jr., Albin Huss, Jr., Robert A. Ware, Altaf Husain
  • Patent number: 5625013
    Abstract: A process for the preparation of a supported catalyst for the polymerization of .alpha.-olefins, in which(1) a silicon dioxide-containing support gel is prepared by(1.1) introducing a sodium water glass or potassium water glass solution into a swirling stream of an aqueous mineral acid longitudinally and tangentially to the stream, spraying the resultant silica hydrosol in drop form into a gaseous medium and allowing it to solidify to form a hydrogel, and freeing the resultant hydrogel from salts by washing without prior ageing,(1.2) drying the hydrogel resulting from (1.1) to form the support gel,(2) the support gel (1) is charged with chromium trioxide or a chromium compound which can be converted into chromium trioxide under the conditions of process step (3), giving a chromium-containing support gel, and(3) the chromium-containing support gel (2) is heated at from 400.degree. to 1100.degree. C.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: April 29, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans-Joachim Mueller, Godofredo Follmer, Rainer Konrad, Roland Saive, Martin Lux, Hans-Helmut Goertz, Guido Funk
  • Patent number: 5622907
    Abstract: A method is provided for improving the catalytic activity of an alcohol synthesis catalyst. In this method, the catalyst, after activation by exposure to a reducing atmosphere, is improved by contacting with a carbon dioxide-containing gas to convert the zinc oxide in the catalyst to zinc carbonate. This improvement step occurs in situ preferably in the same reactor as used for the synthesizing of the alcohol.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: April 22, 1997
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Sunggyu Lee, Vetkav R. Parameswaran, Byung G. Lee, Conrad J. Kulik
  • Patent number: 5621154
    Abstract: Methods are provided for cleaning and inhibiting the formation of fouling deposits on jet engine components during the combustion of turbine combustion fuel oils. Methods 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 polyalkenylthiophosphonic acid added to the turbine combustion fuel oil. The preferred derivative is pentaerythritol ester of polyisobutenylthio-phosphonic acid.
    Type: Grant
    Filed: January 3, 1995
    Date of Patent: April 15, 1997
    Assignee: BetzDearborn Inc.
    Inventors: Bruce E. Wright, William L. Witzig
  • Patent number: 5620588
    Abstract: A process for dewaxing including the steps of mixing a waxy feedstock near its pour point with an ambient or below ambient temperature solvent essentially free of a selected cosolvent, to form a solvent/feedstock mixture, essentially free of a selected cosolvent, and subsequently adding the cosolvent to the solvent/feedstock mixture to cause instantaneous precipitation of wax on addition of cosolvent with the amount of wax precipitation being controlled by the quantity and temperature of cosolvent added. The cosolvent is essentially completely miscible with the solvent, but immiscible with the oil and wax. For example, alcohols (methanol, ethanol, propanol), ketones (ketene, acetone), amines, etc. The process of the present invention provides the advantages of lower solvent ratios (higher solvent recovery), higher filtration temperatures, "environmentally compatible" solvents, rapid filtration rates, and debottlenecking of existing dewaxing plants.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: April 15, 1997
    Inventors: Michael D. Ackerson, Seyed-Hamid Arabshahi, Robert E. Babcock
  • Patent number: 5616532
    Abstract: A photocatalyst composition containing a substantially non-oxidizable binder which allows large amounts of photocatalytic particles to be adhered to a surface. Upon application to a surface, the composition dries or cures to form an adherent, abrasion-resistant, thermostable, and photocatalytic coating.
    Type: Grant
    Filed: October 21, 1994
    Date of Patent: April 1, 1997
    Assignee: E. Heller & Company
    Inventors: Adam Heller, Michael V. Pishko, Ephraim Heller
  • Patent number: 5614456
    Abstract: The interaction of silica, previously calcined at 600.degree. C., with dibutylmagnesium (DBM), 1-butanol and titanium tetrachloride and a solution of methylalumoxane (MAO) and (BuCp).sub.2 ZrCl.sub.2 provides a catalyst that, in the absence of a trialkylaluminum (AlR.sub.3) cocatalyst, produces polyethylene with a bimodal MWD.
    Type: Grant
    Filed: November 3, 1994
    Date of Patent: March 25, 1997
    Assignee: Mobil Oil Corporation
    Inventors: Robert I. Mink, Thomas E. Nowlin, Sandra D. Schregenberger, Pradeep P. Shirodkar, Grace O. Tsien
  • Patent number: 5612485
    Abstract: A carotenoid composition derived from a natural source wherein at least 50% by weight of the carotenoid content of the composition is cis beta-carotene and preferably 9 cis beta-carotene. Typically, the beta-carotene content of the composition is predominantly 9 cis beta-carotene.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: March 18, 1997
    Assignee: Betatene Ltd of Cheltenham
    Inventor: Lance E. Schlipalius
  • Patent number: 5609750
    Abstract: A catalyst composition for converting hydrocarbons in a hydrotreatment process (hydrodesulfurization and/or hydrodenitrogenization) and simultaneously cracking them, containing an alumina-silica-alumina carrier built up from alumina and silica-alumina, on which hydrogenation metals, such as molybdenum, nickel, and/or cobalt, have been provided and which also contains a catalytically active amount of boron, generally in the range of 1 to 20 wt. %. The invention also relates to a process for the preparation of such a catalyst, with boron being provided ahead of the Group VIII component. The carrier material used may be made up of mixtures of alumina and amorphous silica-alumina or of mixtures of alumina and silica-coated alumina. The catalyst composition is highly suitable for converting vacuum gas oil into middle distillate oils by hydrotreating.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: March 11, 1997
    Assignee: Akzo Nobel NV
    Inventors: Pieter J. Nat, Jacob L. de Booys, Johannes W. F. M. Schoonhoven
  • Patent number: 5607892
    Abstract: Zirconium/cerium mixed oxides (optionally including thermally stabilizing dopant values), comprising solid solutions thereof, having contents of zirconium of up to 99% by weight, and having high specific surface areas, are well suited as catalysts and/or catalyst supports, notably for the treatment/conversion of vehicular exhaust gases; such ZrO.sub.2 /CeO.sub.2 mixed oxides are conveniently prepared by (i) intimately admixing a zirconium sol with a cerium sol, the ratio r of the mean diameter r.sub.1 of the particles of the zirconium sol to the diameter r.sub.2 of the particles of the cerium sol being at least 5, (ii) adding a precipitating amount of a base thereto, (iii) recovering the precipitate thus formed, and (iv) calcining the recovered precipitate.
    Type: Grant
    Filed: February 10, 1994
    Date of Patent: March 4, 1997
    Assignee: Rhone-Poulenc Chimie
    Inventors: Thierry Chopin, Gabriel Vilmin
  • Patent number: 5608134
    Abstract: An improved process for preparing a difunctional catalyst active in the hydroisomerization of long-chain normal paraffins is disclosed, which is constituted by an amorphous silica-alumina gel and one or more metals belonging to Group VIIIA,
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: March 4, 1997
    Assignee: Eniricerche S.p.A.
    Inventors: Carlo Perego, Giuseppe Bellussi, Vincenzo Calemma
  • Patent number: RE35632
    Abstract: In an improved method for converting methane to at least one higher hydrocarbon product and coproduct water which comprises contacting a gas comprising methane and at least one added gaseous oxidant with nonacidic solid, the improvement comprising conducting at least a portion of said contacting in the presence of added water.
    Type: Grant
    Filed: January 19, 1993
    Date of Patent: October 14, 1997
    Assignees: Atlantic Richfield Company, Phillips Petroleum Company
    Inventor: David W. Leyshon
  • Patent number: RE35633
    Abstract: In an improved method for converting methane to at least one higher hydrocarbon product and coproduct water which comprises contacting a gas comprising methane and at least one added gaseous oxidant with nonacidic solid, the improvement comprising conducting at least a portion of said contacting in the presence of added water.
    Type: Grant
    Filed: January 19, 1995
    Date of Patent: October 14, 1997
    Assignee: Atlantic Richfield Company
    Inventor: David W. Leyshon