Aromatic Compound Synthesis Patents (Class 585/400)
  • Patent number: 4795842
    Abstract: The invention relates to the conversion of methane to higher hydrocarbons by contact with a solid oxidative synthesizing agent, the specific improvement being the addition to the reaction system of one or more components of the oxidative synthesizing agent which are lost during the reaction.
    Type: Grant
    Filed: August 4, 1987
    Date of Patent: January 3, 1989
    Assignee: Atlantic Richfield Company
    Inventors: Anne M. Gaffney, C. Andrew Jones, John A. Sofranko
  • Patent number: 4760174
    Abstract: Tetralin derivatives of the formula I ##STR1## where X, R.sup.1, R.sup.2 and R.sup.3 have the meanings stated in the description, and their preparation are described. The novel compounds are useful for the treatment of disorders.
    Type: Grant
    Filed: September 20, 1985
    Date of Patent: July 26, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Fritz-Frieder Frickel, Hans-Heiner Wuest, Axel Nuerrenbach
  • Patent number: 4681980
    Abstract: A novel method for improving electrical insulating hydrocarbon. The electrical insulating substance is obtained by dehydrogenating aromatic hydrocarbons having two aromatic nuclei. The electrical insulating substance itself or a mixture of it with other electrical insulating oils is suitable for use in impregnation of electrical appliances.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: July 21, 1987
    Assignee: Nippon Petrochemicals Company Limited
    Inventors: Atsushi Sato, Keiji Endo, Shigenobu Kawakami, Hitoshi Yanagishita, Shozo Hayashi
  • Patent number: 4665260
    Abstract: A continuous method for synthesizing hydrocarbons from a methane source which comprises contacting methane with moving beds of particles comprising an oxidative synthesizing agent under synthesis conditions wherein particles recirculate between two physically separate zones: a methane contact zone and an oxygen contact zone.
    Type: Grant
    Filed: December 19, 1985
    Date of Patent: May 12, 1987
    Assignee: Atlantic Richfield Company
    Inventors: C. Andrew Jones, John J. Leonard, John A. Sofranko
  • Patent number: 4665246
    Abstract: The process of producing ethynyl aromatic compounds which are useful as intermediates in the preparation of 3-dimensional carbon-carbon structures for aerospace and military applications and as starting materials in the preparation of organic semi-conductors. The ethynyl aromatic compounds may be any of the classes illustrated in FIGS. 1, 2 and 3 of the drawing. Starting compounds for the process may by any compound from the classes illustrated in FIGS. 4, 5 and 6. The starting compound is reacted in the presence of a Friedel-Crafts catalyst in a suitable solvent with an acyl compound from the class illustrated in FIG. 7 to yield a compound within the classes illustrated in FIGS. 8, 9 and 10. The carbonyl groups in this compound are reduced to yield a corresponding alcohol. Each hydroxy group in the alcohol is converted to an easily eliminatable group, e.g., by reacting it with methane sulfonyl chloride, when subjected to basic conditions.
    Type: Grant
    Filed: March 9, 1984
    Date of Patent: May 12, 1987
    Assignee: Chem Biochem Research, Inc.
    Inventor: Chris Anderson
  • Patent number: 4608449
    Abstract: Process and device for the production of ethane and/or ethylene by heterogeneous catalytic reaction of methane and oxygen using a catalyst suitable for the formation of C.sub.2 hydrocarbons at increased temperatures, whereby in continuous operation a mixture of methane and oxygen is reacted at temperatures between 500.degree. and 900.degree. C. and at an oxygen partial pressure of less than 0.5 bar at the reactor entrance, while the ratio of the methane partial pressure to the oxygen partial pressure is greater than 1.The conversion reaction takes place with or without gas recycling in a reactor containing a bed of solid catalyst or by the use of a fluidized bed of fluidized catalyst particles, or in a cross-flow reactor with distributed input of oxygen.
    Type: Grant
    Filed: June 2, 1983
    Date of Patent: August 26, 1986
    Assignee: Manfred Baerns
    Inventors: Manfred Baerns, Wilhelm Hinsen
  • Patent number: 4547608
    Abstract: An improved method for converting methane to higher hydrocarbon products by contacting a gas comprising methane with a contact agent at a selected temperature, the agent comprising a reducible metal oxide, a support of at least two oxides, and an alkali metal.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: October 15, 1985
    Assignee: Atlantic Richfield Company
    Inventor: Marvin F. L. Johnson
  • Patent number: 4547607
    Abstract: A method is disclosed for converting methane to higher hydrocarbon product by contacting the methane with a solid which comprises a reducible metal oxide which when contacted with methane at a temperature within the range of about 500.degree. to 1000.degree. C. is reduced and produces higher hydrocarbon products and water, the improvement comprising recycling C.sub.2 + alkanes recovered during subsequent processing of the effluent produced by the contacting to the contacting step.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: October 15, 1985
    Assignee: Atlantic Richfield Company
    Inventors: C. Andrew Jones, John J. Leonard, John A. Sofranko
  • Patent number: 4544787
    Abstract: An improved process for the production of a contact agent comprising digesting a reducible oxide of at least one metal, the oxide of which forms a reduced metal oxide, and a support in the presence of a silicon component, drying the precipitate of the reducible oxide and calcining the precipitate to form the contact agent.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: October 1, 1985
    Assignee: Atlantic Richfield Company
    Inventor: E. William Breder, Jr.
  • Patent number: 4544786
    Abstract: An improved method for converting methane to higher hydrocarbon products by contacting a gas comprising methane with a contact agent at a selected temperature, the agent comprising a reducibile metal oxide, a support of at least two oxides, and an alkali metal.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: October 1, 1985
    Assignee: Atlantic Richfield Company
    Inventors: E. William Breder, Jr., John A. Jaecker, Marvin F. L. Johnson
  • Patent number: 4544784
    Abstract: A method is disclosed for converting methane to higher hydrocarbon product by contacting methane with a contact solid which comprises a reducible metal oxide which when contacted with methane at a temperature within the range of about 500.degree. to 1000.degree. C. is reduced and produces higher hydrocarbon products and water; and a promoting amount of at least one halogen component.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: October 1, 1985
    Assignee: Atlantic Richfield Company
    Inventors: John A. Sofranko, C. Andrew Jones
  • Patent number: 4543207
    Abstract: An improved electrical insulating oil and oil-filled electrical appliances impregnated therewith. The electrical insulating oil is quite suitable for use in oil-filled electrical appliances in which insulating materials or dielectric materials made of plastics are employed. The electrical insulating oil comprises (a) an electrical insulating oil except polyaromatic hydrocarbons and (b) an aromatic monoolefin and/or diolefin having two condensed or noncondensed aromatic nuclei.
    Type: Grant
    Filed: December 20, 1983
    Date of Patent: September 24, 1985
    Assignee: Nippon Petrochemicals Company, Limited
    Inventors: Atsushi Sato, Keiji Endo, Shigenobu Kawakami, Hitoshi Yanagishita, Shozo Hayashi
  • Patent number: 4517398
    Abstract: A method for converting methane to higher hydrocarbon products by contacting, at conditions to convert said hydrocarbons, at least one reducible oxide of at least one metal, associated with a hydroxylated magnesia support (that is, magnesia derived from magnesium hydroxide or a magnesium-containing component contacted with hydroxyl-containing material), which support is calcined prior to the addition of the reducible oxide.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: May 14, 1985
    Assignee: Atlantic Richfield Company
    Inventor: John A. Sofranko
  • Patent number: 4513164
    Abstract: This invention relates to a new process for the direct conversion of natural gas or methane into gasoline-range hydrocarbons (i.e., synthetic transportation fuels or lower olefins) via catalytic condensation using superacid catalysts.
    Type: Grant
    Filed: February 14, 1984
    Date of Patent: April 23, 1985
    Inventor: George A. Olah
  • Patent number: 4511754
    Abstract: A method for dehydrogenating dehydrogenatable hydrocarbons which comprises contacting hydrocarbon with an oxide of Tb having combined therewith an amount of alkali and/or alkaline earth metal which is sufficient to improve the selectivity to dehydrogenated hydrocarbon products. The oxide is reduced by the contact which is carried at about 500.degree. to 1000.degree. C. Reducible oxides of Tb are regenerated by oxidizing the reduced composition with molecular oxygen. Solids prepared from the oxide Tb.sub.4 O.sub.7 are particularly effective in the process.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: April 16, 1985
    Assignee: Atlantic Richfield Company
    Inventor: Anne M. Gaffney
  • Patent number: 4499322
    Abstract: An improved method for converting methane to higher hydrocarbon products by contacting a gas comprising methane and an oxidative synthesizing agent at synthesizing conditions, the improvement which comprises contacting methane with an oxidative synthesizing agent containing a promoting amount of alkali metal and/or compounds thereof. Sodium is a particularly effective promoter. Stability of the promoted contact agent is enhanced by the presence of phosphorus.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: February 12, 1985
    Assignee: Atlantic Richfield Company
    Inventors: C. Andrew Jones, John A. Sofranko
  • Patent number: 4495374
    Abstract: An improved method for converting methane to higher hydrocarbon products by contacting a gas comprising methane and an oxidative synthesizing agent under systhesis conditions, the improvement which comprises contacting methane with an oxidative synthesizing agent containing a promoting amount of alkaline earth metal and/or compounds thereof. Magnesium is a particularly effective promoter. Stability of the promoted contact agent is enhanced by the presence of phosphorus.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: January 22, 1985
    Assignee: Atlantic Richfield Company
    Inventors: C. A. Jones, John A. Sofranko
  • Patent number: 4467130
    Abstract: This invention relates to a new process for the direct conversion of natural gas or methane into gasoline-range hydrocarbons (i.e., synthetic transportation fuels or lower olefins) via catalytic condensation using superacid catalysts.
    Type: Grant
    Filed: June 16, 1983
    Date of Patent: August 21, 1984
    Inventor: George A. Olah
  • Patent number: 4465893
    Abstract: This invention relates to a new process for the direct conversion of natural gas or methane into gasoline range hydrocarbons (i.e., synthetic transportation fuels or lower olefins) via catalytic condensation using superacid catalysts.
    Type: Grant
    Filed: August 25, 1982
    Date of Patent: August 14, 1984
    Inventor: George A. Olah
  • Patent number: 4450310
    Abstract: A methane conversion process is provided for the production of olefins and hydrogen comprising contacting methane in the absence of oxygen and in the absence of water at a reaction temperature of at least 500.degree. C. with a catalyst comprising the mixed oxides of a first metal selected from lithium, sodium, potassium, rubidium, cesium and mixtures thereof, a second metal selected from beryllium, magnesium, calcium, strontium, barium, and mixtures thereof, and optionally a promoter metal selected from copper, rhenium, tungsten, zirconium, rhodium, and mixtures thereof.
    Type: Grant
    Filed: March 4, 1983
    Date of Patent: May 22, 1984
    Assignee: The Standard Oil Company
    Inventors: Joseph R. Fox, Benedict S. Curatolo, Frederick A. Pesa
  • Patent number: 4444984
    Abstract: A method for synthesizing hydrocarbons from a methane source which comprises contacting methane with an oxide of tin at a temperature of about 500.degree. to 1000.degree. C. The oxide is reduced by the contact and coproduct water is formed. A reducible oxide of tin is regenerated by oxidizing the reduced composition with molecular oxygen. The oxide SnO.sub.2 is a particularly effective synthesizing agent.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: April 24, 1984
    Assignee: Atlantic Richfield Company
    Inventors: C. Andrew Jones, John J. Leonard, John A. Sofranko
  • Patent number: 4443646
    Abstract: A method for synthesizing hydrocarbons from a methane source which comprises contacting methane with an oxide of bismuth at a temperature of about 500.degree. to 850.degree. C. The oxide is reduced by the contact and coproduct water is formed. A reducible oxide of bismuth is regenerated by oxidizing the reduced composition with molecular oxygen. The oxide Bi.sub.2 O.sub.3 is a particularly effective solid synthesizing agent.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: April 17, 1984
    Assignee: Atlantic Richfield Company
    Inventors: C. Andrew Jones, John J. Leonard, John A. Sofranko
  • Patent number: 4443645
    Abstract: A method for synthesizing hydrocarbons from a methane source which comprises contacting methane with an oxide of germanium at a temperature of 500.degree. to 800.degree. C. The oxide is reduced by the contact and coproduct water is formed. A reducible oxide of germanium is regenerated by oxidizing the reduced composition with molecular oxygen. The oxide GeO.sub.2 is a particularly effective synthesizing agent.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: April 17, 1984
    Assignee: Atlantic Richfield Company
    Inventors: C. Andrew Jones, John J. Leonard, John A. Sofranko
  • Patent number: 4443647
    Abstract: A method for synthesizing hydrocarbons from a methane source which comprises contacting methane with an oxide of lead at a temperature of about 500.degree. to 1000.degree. C. The oxide is reduced by the contact and coproduct water is formed. A reducible oxide of lead is regenerated by oxidizing the reduced composition with molecular oxygen. The oxide PbO is a particularly effective synthesizing agent.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: April 17, 1984
    Assignee: Atlantic Richfield Company
    Inventors: C. Andrew Jones, John J. Leonard, John A. Sofranko
  • Patent number: 4443644
    Abstract: A method for synthesizing hydrocarbons from a methane source which comprises contacting methane with an oxide of antimony at a temperature of about 500.degree. to 1000.degree. C. The oxide is reduced by the contact and coproduct water is formed. A reducible oxide of antimony is regenerated by oxidizing the reduced composition with molecular oxygen. The oxide Sb.sub.2 O.sub.3 is a particularly effective synthesizing agent.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: April 17, 1984
    Assignee: Atlantic Richfield Company
    Inventors: C. Andrew Jones, John J. Leonard, John A. Sofranko
  • Patent number: 4443649
    Abstract: A method for synthesizing hydrocarbons from a methane source which comprises contacting methane with an oxide of manganese at a temperature of about 500.degree. to 1000.degree. C. The oxide is reduced by the contact and coproduct water is formed. A reducible oxide of manganese is regenerated by oxidizing the reduced composition with molecular oxygen. The oxide Mn.sub.3 O.sub.4 is a particularly effective synthesizing agent.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: April 17, 1984
    Assignee: Atlantic Richfield Company
    Inventors: C. Andrew Jones, John J. Leonard, John A. Sofranko
  • Patent number: 4443648
    Abstract: A method for synthesizing hydrocarbons from a methane source which comprises contacting methane with an oxide of indium at a temperature of about 500.degree. to 850.degree. C. The oxide is reduced by the contact and coproduct water is formed. A reducible oxide of indium is regenerated by oxidizing the reduced composition with molecular oxygen. The oxide In.sub.2 O.sub.3 is a particularly effective solid synthesizing agent.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: April 17, 1984
    Assignee: Atlantic Richfield Company
    Inventors: C. Andrew Jones, John J. Leonard, John A. Sofranko
  • Patent number: 4384981
    Abstract: The instant invention relates to a novel hydrogenation catalyst comprising a composite of a Group VIII metal or Group VIII metal compound and a compound selected from the group consisting of compounds represented by the general formulaM(O.sub.3 ZO.sub.x R).sub.nwherein M comprises a tetravalent metal, Z comprises a pentavalent atom, R is selected from the group consisting of hydrogen, organo radicals and mixtures thereof provided that at least a portion of said radicals comprise a moiety selected from the group consisting of pyridyl, allyl, anthranilic acid radicals and mixtures thereof; x is 0 or 1, and n is 2, provided that n is 1 when R is terminated with a tri- or tetra-oxy pentavalent atom. This catalyst is useful in hydrogenation processes which comprise contacting said catalyst with an unsaturated compound, said unsaturated compound comprising at least one unsaturated bond, e.g., a carbon-carbon bond, a carbon-nitrogen bond, a carbon-oxygen bond, or a nitrogen-oxygen bond, etc.
    Type: Grant
    Filed: August 24, 1981
    Date of Patent: May 24, 1983
    Assignee: Occidental Research Corporation
    Inventors: Martin B. Dines, Peter M. DiGiacomo, Kenneth P. Callahan
  • Patent number: 4299986
    Abstract: Mixed alkoxy-hydride derivatives of aluminum and alkaline-earth metals are disclosed having the formulaM[AlH.sub.4-n (OR).sub.n ].sub.2which may be complexed with a Lewis base wherein M is an alkaline-earth metal, R is selected from an aliphatic, cycloaliphatic or aromatic group having from 1 to 20 carbon atoms and n is a number between 0.5 and 3.5. There is also disclosed a novel process for preparing said derivatives which are useful as reducing agents.
    Type: Grant
    Filed: December 18, 1979
    Date of Patent: November 10, 1981
    Assignee: Anic, S.p.A.
    Inventor: Salvatore Cucinella
  • Patent number: 4292456
    Abstract: An oxydehydrogenation process for producing indene and substituted indenes from indene precursors more saturated than indene is described and comprises contacting said precursor with oxygen and a catalyst comprising cobalt oxide and molybdenum oxide at an elevated temperature above about 300.degree. C. Preferably the reaction is conducted at a temperature of about 500.degree.-650.degree. C. for a period of from 0.1 to about 30 seconds.
    Type: Grant
    Filed: December 28, 1979
    Date of Patent: September 29, 1981
    Assignee: The Standard Oil Co.
    Inventor: Oliver A. Kiikka
  • Patent number: 4292455
    Abstract: A multi-stage dehydrogenation process for preparing indene and substituted indenes from indene precursors more saturated than indene is described. The process comprises the steps of(a) contacting said indene precursor in a first dehydrogenation zone with a dehydrogenation catalyst at an elevated temperature to form an intermediate product,(b) advancing the product of the first dehydrogenation zone to a second dehydrogenation zone,(c) contacting said product in the second dehydrogenation zone with a second dehydrogenation catalyst at an elevated temperature, and(d) recovering indene or a substituted indene from said second zone.The process of the invention results in yields of indene which are enhanced when compared to single stage, essentially isothermal processes using a single catalyst.
    Type: Grant
    Filed: December 28, 1979
    Date of Patent: September 29, 1981
    Assignee: The Standard Oil Co.
    Inventors: Joseph P. Bartek, Rimoydas L. Cepulis, Robert K. Grasselli
  • Patent number: 4291180
    Abstract: A process for the co-production of indene and styrene from a mixture of cyclopentadiene or dicyclopentadiene and butadiene is disclosed. The process comprises the steps of reacting cyclopentadiene or dicyclopentadiene with butadiene in a Diels-Alder reaction to form a mixture of tetrahydroindene, vinylcyclohexene and vinylnorbornene followed by the recovery of the tetrahydroindene and vinylcyclohexene, and the oxydehydrogenation of the tetrahydroindene/vinylcyclohexene mixture utilizing a composite catalyst comprising cobalt oxide and molybdenum oxide.
    Type: Grant
    Filed: December 28, 1979
    Date of Patent: September 22, 1981
    Assignee: Standard Oil Company
    Inventor: Oliver A. Kiikka
  • Patent number: 4291181
    Abstract: A dehydrogenation process for producing indene and substituted indenes from tetrahydroindene or substituted tetrahydroindene is described and comprises contacting said tetrahydroindene or substituted tetrahydroindene with a catalyst comprising cobalt oxide and molybdenum oxide at an elevated temperature for a period of from about 0.1 to 30 seconds. The tetrahydroindene and substituted tetrahydroindenes may be prepared from cyclopentadiene or dicyclopentadiene and a butadiene.
    Type: Grant
    Filed: December 28, 1979
    Date of Patent: September 22, 1981
    Assignee: Standard Oil Company
    Inventors: Oliver A. Kiikka, George S. Li
  • Patent number: 4282354
    Abstract: In general, materials having the structure ##STR1## wherein A represents phenylene, napthylene, anthracenediyl, and dibenzothien-diyl;R.sub.1 and R.sub.2, which may be the same or different when taken alone represent hydrogen, cyano, alkylcarbonyl and arylcarbamoyl, arylcarbonyl, cyanoaryl;R.sub.1 and R.sub.2, when taken together, represent sufficient atoms to form substituted and unsubstituted radicals selected from the group consisting of furanylidene, fluorenylidene, pyrimidinylidene, thiazolidinylidene, pyrrolinyl, and indenyl, isoxazolinylidene, pyrazolinylidene and indanylidene, wherein said substituents are selected from the group consisting of hydrogen, cyano, aryl, oxo, thioxo, nitro, alkyl, nitroaryl, carbamoyl and cyanoalkyl; andalkyl represents an alkyl group having from one to six carbon atoms; aryl represents an aromatic nucleus selected from the group consisting of benzene, napthalene or anthracene, are useful in electrophoretic migration imaging processes.
    Type: Grant
    Filed: April 18, 1979
    Date of Patent: August 4, 1981
    Assignee: Eastman Kodak Company
    Inventors: James A. Van Allan, Louis J. Rossi, Melvin S. Bloom, Michael T. Regan, Hal E. Wright, Joseph Y. Kaukeinen
  • Patent number: 4267388
    Abstract: There is disclosed a novel process for preparing anti-inflammatory ethynylbenzene derivatives represented by the general formula I: ##STR1## wherein Y is hydrogen, halogen or loweralkyl of 1 to 3 carbon atoms; R represents a ring having the structure: ##STR2## wherein x is 1 to 3, or a ring of the structure: ##STR3## wherein Y' is hydrogen, halogen, loweralkyl of 1 to 3 carbon atoms and loweralkoxy of 1 to 3 carbon atoms; Y" is hydrogen or halogen; and Y"' is hydrogen or halogen, provided Y, Y', Y" and Y"' are not all hydrogen at the same time, by reacting a benzyl alcohol of formula V: ##STR4## with a sulfonyl chloride, reducing the sulfonate VI of the formula: ##STR5## and dehydrohalogenating the formed .beta.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: May 12, 1981
    Assignee: William H. Rorer, Inc.
    Inventors: Paul R. Darkes, Henry F. Campbell, George H. Douglas
  • Patent number: 4235755
    Abstract: Dehydrogenatable hydrocarbons are dehydrogenated by contacting them, at dehydrogenation conditions, with a nonacidic catalytic composite comprising a combination of catalytically effective amounts of a platinum group component, a cobalt component, a lanthanide series component and an alkali or alkaline earth component with a porous carrier material. A specific example of the nonacidic catalytic composite disclosed herein is a combination of a platinum group component, a cobalt component, a lanthanide series component, and an alkali or alkaline earth component with a porous carrier material in amounts sufficient to result in a composite containing about 0.01 to about 2 wt. % platinum group metal, about 0.05 to about 5 wt. % cobalt, about 0.01 to about 5 wt. % lanthanide series metal and about 0.1 to about 5 wt. % alkali metal or alkaline earth metal.
    Type: Grant
    Filed: February 21, 1979
    Date of Patent: November 25, 1980
    Assignee: UOP Inc.
    Inventor: George J. Antos
  • Patent number: 4218572
    Abstract: Substituted or unsubstituted cyclohexylbenzene is dehydrogenated to substituted or unsubstituted biphenyl in the absence of oxygen over an oxide complex catalyst. The oxide complex catalyst comprises at least one element selected from the group consisting of Group VB and Group VIII elements, optionally promoted with at least one element selected from the group consisting of Group IA, Group IB, Group IIB, Group VIIB and Group VIB.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: August 19, 1980
    Assignee: Standard Oil Company
    Inventors: Serge R. Dolhyj, Louis J. Velenyi
  • Patent number: 4198535
    Abstract: A process for producing a linear unsaturated dimer of .alpha.-alkyl styrenes by heating .alpha.-alkyl styrenes in the presence of a silica-alumina catalyst, said catalyst consisting of alumina and silica in a weight ratio of 83/17.ltoreq.Al.sub.2 O.sub.3 /SiO.sub.2 .ltoreq.96/4 and being substantially free of alkali is disclosed.
    Type: Grant
    Filed: September 27, 1978
    Date of Patent: April 15, 1980
    Assignee: Mitsui Petrochemical Industries Ltd.
    Inventors: Kazunori Takahata, Hiroshi Hasui