Patents Examined by Asok Pal
  • Patent number: 5583085
    Abstract: Dehydroxylated oxide (e.g. silica) particles are obtained by reacting oxide particles, having surface hydroxyl groups, with a dialkylcarbonate or diarylcarbonate. The resulting products have surface alkoxy or aryloxy groups and significantly reduced hydroxyl content. The treated oxide particles are especially suitable for use as catalyst supports, and especially as polyolefin catalyst supports.
    Type: Grant
    Filed: October 31, 1994
    Date of Patent: December 10, 1996
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: David G. Ward
  • Patent number: 5583274
    Abstract: C.sub.2 -C.sub.6 alkynes (preferably acetylene) contained in feeds which also contain sulfur impurities are hydrogenated to the corresponding alkenes in the presence of a supported palladium catalyst which has been promoted with alkali metal fluoride (preferably potassium fluoride).
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: December 10, 1996
    Assignee: Phillips Petroleum Company
    Inventors: Tin-Tack P. Cheung, Marvin M. Johnson
  • Patent number: 5583273
    Abstract: A method for inhibiting the formation of clathrate hydrates in a fluid having hydrate forming constituents is disclosed. More specifically, the method can be used in treating a petroleum fluid stream such as natural gas conveyed in a pipe to inhibit the formation of a hydrate restriction in the pipe. The hydrate inhibitors used for practicing the method are substantially water soluble polymers formed from a cyclic imino ether. Such polymers may be ring closed cyclic imino ether ("CIE") polymers, ring opened CIE polymers, or combinations thereof. Some examples of ring opened CIE polymers include various N-acyl polyalkyleneimines produced by cationic polymerization, such as N-acyl substituted polyethyleneimine, N-acyl substituted polypropyleneimine, N-acyl substituted polybutyleneimine, N-acyl substituted polypentyleneimine and copolymers thereof.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: December 10, 1996
    Assignee: Exxon Production Research Company
    Inventors: Karla S. Colle, Russell H. Oelfke
  • Patent number: 5583277
    Abstract: A process for the removal of large molecules from waste or process streams using an M41S material as an adsorbent. The process is useful for the removal of trace amounts of polynuclear aromatics from complex hydrocarbon mixtures in the vapor phase, such as reformate.
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: December 10, 1996
    Assignee: Mobil Oil Corporation
    Inventor: Guenter H. Kuehl
  • Patent number: 5582712
    Abstract: An FCC arrangement uses two stages upflow conduit combustion and a regenerator cyclone separator to supply catalyst particles from a dip leg directly into a downflow reaction conduit. The downflow reaction conduit provides an immediate stage of initial catalyst and gas separation at its outlet end. The arrangement and method offers an improved method of operating an FCC reactor and regeneration zone without the use of large reactor or regeneration vessels. One form of the invention also uses enlarged dip pipe conduits to provide discrete zones of catalyst stripping thereby eliminating all relatively large pressure vessels from FCC method and arrangement of this invention.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: December 10, 1996
    Assignee: UOP
    Inventors: Randy J. Zinke, William J. Koves
  • Patent number: 5580839
    Abstract: A method of preparing a catalyst precursor comprises dissolving an iron salt and a salt of an oxoanion forming agent, in water so that a solution of the iron salt and oxoanion forming agent salt has a ratio of oxoanion/Fe of between 0.0001:1 to 0.5:1. Next is increasing the pH of the solution to 10 by adding a strong base followed by collecting of precipitate having a binary ferrihydrite structure. A binary ferrihydrite catalyst precursor is also prepared by dissolving an iron salt in water. The solution is brought to a pH of substantially 10 to obtain ferrihydrite precipitate. The precipitate is then filtered and washed with distilled water and subsequently admixed with a hydroxy carboxylic acid solution. The admixture is mixed/agitated and the binary ferrihydrite precipitate is then filtered and recovered.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: December 3, 1996
    Assignee: University of Kentucky Research Foundation
    Inventors: Gerald P. Huffman, Jianmin Zhao, Zhen Feng
  • Patent number: 5578161
    Abstract: An apparatus (20) for monitoring the trench formation process in a silicon wafer on a full in-situ and on-line basis. The apparatus includes two spectrometers (30A, 30B) for viewing the plasma used in the trench etching process at zero and normal angles of incidence with respect to the plane of the wafer, respectively. Both spectrometers are tuned to detect the radiation associated with a selected specie present in the plasma. Based on information contained in the output signals of the spectrometers, the depth D of the trench and the thickness Th and rate of deposition of the redeposited SiO.sub.2 layer are computed in real time. When the computed depth D matches a final depth of parameter, the trench formation process is terminated.
    Type: Grant
    Filed: April 15, 1992
    Date of Patent: November 26, 1996
    Assignee: International Business Machines Corporation
    Inventor: Bernard Auda
  • Patent number: 5578196
    Abstract: The invention concerns a process for reducing the benzene content of petrol fractions, in which hydrogenation is carried out on a feed with the following composition by weight: 40% to 80% of paraffins, 0.5% to 7% of cyclic hydrocarbons and 6% to 45% of aromatics, and with a maximum distillation temperature of between 70.degree. C. and 90.degree. C., followed by isomerisation of the effluent from the hydrogenation step, mixing said feed and/or said effluent with a C.sub.5 -C.sub.6 cut; said process being characterised in that an isomerisation catalyst is used which contains chlorine and at least one group VIII metal deposited on a support composed of a mixture of specific proportions of eta alumina and gamma alumina.
    Type: Grant
    Filed: December 29, 1994
    Date of Patent: November 26, 1996
    Assignee: Institut Francais du Petrole
    Inventors: Christine Travers, Philippe Courty, Patrick Sarrazin
  • Patent number: 5578744
    Abstract: A catalytically active gel is described consisting of a silica matrix with uniform porosity, monomodal pore distribution and high surface area, within which one or metal oxides possessing catalytic activity are dispersed. A process for preparing this catalytic gel is also described.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: November 26, 1996
    Assignees: Eniricerche S.p.A., Snamprogetti S.p.A.
    Inventors: Angela Carati, Enrico Davini, Mario G. Clerici, Giuseppe Bellussi
  • Patent number: 5578742
    Abstract: The present invention concerns new substituted 3,4-bis(phenyl)-3-hexenes and pharmaceutical compositions which contain these compounds as active substances.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: November 26, 1996
    Inventors: Manfred Metzler, Reinhard Pechan
  • Patent number: 5576261
    Abstract: A naphtha or a middle distillate hydrocarbon is hydrodearomatized by hydrotreating in the presence of a catalyst containing a carbon support bearing (i) molybdenum or tungsten, (ii) a metal or non-noble Group VIII, and (iii) chromium.
    Type: Grant
    Filed: July 22, 1994
    Date of Patent: November 19, 1996
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhaker, Frank Dolfinger, Jr., Max R. Cesar
  • Patent number: 5575902
    Abstract: Methods for cracking hydrocarbons in reactor systems having improved resistances to carburization and coking. The reactor system comprises a steel portion having provided thereon a Group VIB metal protective layer to isolate the steel portion from hydrocarbons, applied to a thickness effective for completely isolating the steel portion from the hydrocarbon environment. The protective layer is anchored to the steel substrate through an intermediate carbide-rich, bonding layer.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: November 19, 1996
    Assignee: Chevron Chemical Company
    Inventors: John V. Heyse, Alan G. Kunze, Steven E. Trumbull
  • Patent number: 5574199
    Abstract: A process for shape selective hydrocarbon aromatization that involves contacting a hydrocarbon feedstream, under aromatization conditions, with a catalytic molecular sieve which has been modified by being ex situ selectivated with a silicon compound. The ex situ selectivation involves exposing the catalytic molecular sieve to at least two selectivation sequences, each sequence comprising contacting the catalytic molecular sieve with a silicon compound followed by calcination. Optionally, the modified catalytic molecular sieve may be further selectivated in situ.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: November 12, 1996
    Assignee: Mobil Oil Corporation
    Inventors: Jeffrey S. Beck, Ralph M. Dessau
  • Patent number: 5573993
    Abstract: A process for the preparation of an activated catalyst for the polymerization of olefins, includes mixing, in the absence of a solvent, at least one chromium salt with a support composition including 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); preactivating the mixture by heating in an oxidizing atmosphere at a temperature which is lower than the melting temperature of the at least one chromium salt to obtain a catalyst precursor; and activating the catalyst precursor by calcining in an oxidizing atmosphere and under conditions such that part of the chromium is converted to hexavalent chromium.
    Type: Grant
    Filed: July 8, 1994
    Date of Patent: November 12, 1996
    Assignee: Solvay(Societe Anonyme)
    Inventor: Benoit Koch
  • Patent number: 5573991
    Abstract: A process for forming a supported metal carbide catalyst, for example, a Group VIB transition metal carbide, such as tungsten carbide, which process comprises the calcination of a carbon support that has been impregnated with a metal carbide precursor comprising a water soluble salt of: (1) a cation comprising nitrogen-hydrogen bonded moieties, such as a guanidine cation; and (2) an anion, such as a tungstate anion, comprising metal-oxygen bonded moieties, so that upon calcination the product formed is the metal carbide and the by-products comprise ammonia and carbon dioxide.
    Type: Grant
    Filed: May 20, 1994
    Date of Patent: November 12, 1996
    Assignee: Akzo Nobel N.V.
    Inventors: Fawzy G. Sherif, Anantha N. Desikan
  • Patent number: 5573990
    Abstract: A zeolite catalyst from ZSM-5 modified with phosphorus, rare earth elements and pore structure regulator is used for methanol/dimethyl ether conversion to light olefins.High temperature, non-recycling, continuous-running process is realized in the reactor system, comprising a dehydration reactor and several (2-n) adiabatic, fixed bed cracking reactors, loaded with the catalyst in multi-stage packing and operated in reaction regeneration cycles. The catalyst possesses high activity, high selectivity, good hydrothermal stability and long reaction life time.Operation of 100% methanol conversion and >85% C.sub.2 -C.sub.4 selectivity has been performed in a reactor system of the scale 0.7-1 ton CH.sub.3 OH/day for >600 hours on stream and with reaction time of single cycle >24 hours.
    Type: Grant
    Filed: August 9, 1994
    Date of Patent: November 12, 1996
    Assignee: Dalian Institute of Chemical Physics
    Inventors: Gongwei Wang, Muliang Ying, Xingchun Wang, Guoquan Chen
  • Patent number: 5573988
    Abstract: The present invention concerns a regeneration process for a catalyst containing at least one metallic element selected from the group formed by platinum, palladium, ruthenium, rhodium, osmium, iridium and nickel, preferably platinum, on a refractory oxide based support, which has been deactivated by coke deposition. The regeneration process is characterised in that said regeneration consists of treatment with a gas containing at least chlorine and molecular oxygen, at a temperature between 20.degree. C. and 800.degree. C. and a total gas flow rate, expressed in liters of gas per hour and per gram of catalyst, of between 0.05 and 20. The process at least restores the initial catalytic properties of the catalyst.
    Type: Grant
    Filed: December 18, 1995
    Date of Patent: November 12, 1996
    Assignee: Institut Francais du Petrole
    Inventor: Blaise Didillon
  • Patent number: 5574201
    Abstract: The alkylation of C.sub.2 -C.sub.12 alkanes (preferably isobutane) with C.sub.2 -C.sub.12 alkenes (preferably butene-2), in the presence of trifluoromethanesulfonic acid on a solid inorganic material as catalyst, is carried out with dicyclopentadiene and/or tetrahydrodicyclopentadiene as additional alkylating agent(s).
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: November 12, 1996
    Assignee: Phillips Petroleum Company
    Inventor: Lyle R. Kallenbach
  • Patent number: 5573989
    Abstract: A process for producing an olefin oxide comprising oxidizing a corresponding lower olefin with molecular oxygen in the gas phase in the presence of a crystalline metallosilicate having supported thereon at least one salt selected from the group consisting of alkali metal salts of nitric acid, alkaline earth metal salts of nitric acid, silver salts of nitric acid and silver salts of nitrous acid. Said process can produce an olefin oxide at a high selectivity.
    Type: Grant
    Filed: August 5, 1994
    Date of Patent: November 12, 1996
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Keisuke Sugita, Toshikazu Yagi
  • Patent number: 5574200
    Abstract: A process for the preparation of an aqueous suspension of a solid free-radical forming initiator, a plant for the preparation, an initiator suspension and use of the suspension in polymerization of ethylenically unsaturated monomers. The process for the preparation of the suspension comprises the steps of:(a) heating the initiator to its melting point;(b) finely dividing the initiator in water while it is in a molten state;(c) rapid cooling so that the initiator is in a molten state for a period of time which is less than about 5 minutes.The initiator suspension has very small particles and a narrow particle size distribution whereby at least 50% by weight of the particles are smaller than 5 .mu.m and at least 90% by weight of the particles are smaller than 10 .mu.m.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: November 12, 1996
    Assignee: Akzo Nobel N.V.
    Inventors: Claes Lundin, Berit Simonsson