Patents Examined by Edward J. Meros
  • Patent number: 4544539
    Abstract: A zeolite related to zeolite L and having a characteristic cylindrical morphology may be prepared from a crystallization gel comprising (in mole ratios of oxides):K.sub.2 O/SiO.sub.2 : 0.22-0.36H.sub.2 O/K.sub.2 O: 25-90SiO.sub.2 /Al.sub.2 O.sub.3 : 6-15and preferably with the mole ratio H.sub.2 O/K.sub.2 O+Al.sub.2 O.sub.3 +SiO.sub.2 being at least 8. The cylindrical Zeolite L may be used as a catalyst base in aromatization of acyclic hydrocarbons with high benzene yields being sustained over commercially feasible periods.
    Type: Grant
    Filed: May 11, 1983
    Date of Patent: October 1, 1985
    Assignee: Exxon Research & Engineering Co.
    Inventor: Theodorus M. Wortel
  • Patent number: 4540559
    Abstract: Type Y zeolites were adopted as, e.g., catalysts and adsorbents, are facilely prepared by (i) intimately admixing, at essentially ambient temperature, an aqueous solution of a water-soluble aluminum compound with an aqueous solution of sodium silicate as to prepare a reaction mixture solution or sol therefrom, (ii) next heating said reaction mixture solution or sol to a temperature of crystallization, ranging from about 50.degree. to 120.degree. C., by heat exchange within such rapid period of time as to avoid any phase conversion thereof, but whereafter said reaction mixture solution or sol transforms essentially immediately into a gel, and (iii) thence maintaining the resulting gel at such crystallization temperature until Type Y zeolite crystals are crystallized therefrom.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: September 10, 1985
    Assignee: Rhone-Poulenc Specialites Chimiques
    Inventors: Bertrand Latourrette, Regis Poisson
  • Patent number: 4540562
    Abstract: A process is provided for the production of vanadyl hydrate including solvent extraction and stripping steps. The vanadyl hydrate is then reacted with carbon to produce vanadium carbide.
    Type: Grant
    Filed: May 27, 1983
    Date of Patent: September 10, 1985
    Assignee: Umetco Minerals Corporation
    Inventor: Harry E. Gardner
  • Patent number: 4539191
    Abstract: Sodium silicate solutions are prepared by dissolving sand in sodium hydroxide solution at a pressure of at least 100 psig and at a temperature of at least 130.degree. C. to produce a sodium silicate solution having a silica to sodium oxide molar ratio of between 2.4:1 and 2.8:1, and activating said sodium silicate solution by reaction with from about 50 to 200 ppm of alumina.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: September 3, 1985
    Assignee: J. M. Huber Corporation
    Inventor: John A. Kostinko
  • Patent number: 4539193
    Abstract: This invention relates to a new and improved form of crystalline silicate identified as zeolite ZSM-12, to a new and useful improvement in synthesizing said crystalline silicate and to use of said crystalline silicate prepared in accordance herewith as a catalyst for organic compound, e.g. hydrocarbon compound, conversion.
    Type: Grant
    Filed: May 23, 1984
    Date of Patent: September 3, 1985
    Assignee: Mobil Oil Corporation
    Inventor: Ernest W. Valyocsik
  • Patent number: 4537758
    Abstract: A method of preparing a highly siliceous porous crystalline material related to the zeolite ZSM-12 having a composition, in terms of mole ratios of oxides, after dehydration, as follows:(1.0.+-.0.4)M.sub.2 /.sub.n O.multidot.Al.sub.2 O.sub.3 .multidot.(20-.infin.)SiO.sub.2,wherein M is at least one cation having a valence n, and characterized by an x-ray diffraction pattern whose values are set forth in Table 1 of the specification.
    Type: Grant
    Filed: March 19, 1984
    Date of Patent: August 27, 1985
    Assignee: Mobil Oil Corporation
    Inventors: Pochen Chu, Guenter H. Kuehl
  • Patent number: 4537757
    Abstract: A novel crystalline aluminosilicate which exhibits a specific X-ray diffraction pattern having at least seven diffraction lines showing the following relative intensities at the positions of the following respective diffraction angle (2.theta.):______________________________________ Diffraction angle (2.theta., deg) Relative intensity ______________________________________ 7.8 .+-. 0.2 5-30 8.7 .+-. 0.2 90-100 8.9 .+-. 0.2 90-100 17.5 .+-. 0.2 5-30 17.7 .+-. 0.2 5-30 23.1 .+-. 0.2 30-80 23.3 .+-. 0.2 20-50 ______________________________________Such a crystalline aluminosilicate is produced by the mutual reaction of the components of a mixture of a silica source, an alumina source, a sodium source and water in the presence of 1,8-diamino-4-aminomethyloctane. The crystalline aluminosilicate thus prepared has an excellent catalytic activity and exhibits a specific adsorption behavior.
    Type: Grant
    Filed: March 30, 1984
    Date of Patent: August 27, 1985
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Masazumi Chono, Hiroshi Ishida
  • Patent number: 4534950
    Abstract: A process for producing carbon fibers, comprising melt spinning a carbonaceous pitch to obtain pitch fibers, contacting the thus obtained pitch fibers with hydrobromic acid, making the thus contacted fibers infusible in an oxidizing atmosphere and then carbonizing and, if desirable, graphitizing the thus treated pitch fibers to obtain the carbon fibers.
    Type: Grant
    Filed: August 4, 1983
    Date of Patent: August 13, 1985
    Assignee: Nippon Oil Co., Ltd.
    Inventors: Seiichi Uemura, Takao Hirose, Yoshio Sohda
  • Patent number: 4534947
    Abstract: Zeolite A containing sodium and potassium ions, otherwise known as 3 .ANG. molecular sieve, may be prepared by a direct route when the aqueous aluminosilicate reaction mixture to be aged at elevated temperatures contains a mole ratio of Na.sub.2 O to Na.sub.2 O and K.sub.2 O which is greater by a factor of about 1.1 than the mole ratio of Na.sub.2 O to Na.sub.2 O and K.sub.2 O in the zeolite A product. Preferably, the reaction mixture also contains zeolitic nucleation seeds to promote crystallization of the product.
    Type: Grant
    Filed: May 4, 1984
    Date of Patent: August 13, 1985
    Assignee: Exxon Research and Engineering Co.
    Inventor: David E. W. Vaughan
  • Patent number: 4534951
    Abstract: Calcined anthracite coal particles are substituted for petroleum coke in the manufacture of high quality graphite electrodes.
    Type: Grant
    Filed: November 17, 1983
    Date of Patent: August 13, 1985
    Assignee: Union Carbide Corporation
    Inventors: James W. Kortovich, Eugene Micinski
  • Patent number: 4533533
    Abstract: Selective and controlled dealumination of an aluminosilicate zeolite is achieved by filling the pore system of the zeolite with a foreign material, for example coke, removing part of the foreign material from the outer portion of the zeolite, for example by heating in a gas stream comprising oxygen, dealuminating the outer portion, and then removing the remainder of the foreign material. Use of such a partially dealuminated zeolite as catalyst in a toluene disproportionation reaction leads to greater selectivity to paraxylene.
    Type: Grant
    Filed: May 23, 1983
    Date of Patent: August 6, 1985
    Assignee: Imperial Chemical Industries, PLC
    Inventors: John Dewing, Philip J. Hogan, Allan Stewart
  • Patent number: 4533649
    Abstract: The present invention relates to a process for producing crystalline aluminosilicates having in the hydrogen form an X-ray diffraction pattern substantially as set forth in Table 1 of this specification and the following composition in terms of the mole ratios of the oxides:0.9=0.2 M.sub.2 /.sub.n O:Al.sub.2 O.sub.3 :xSiO.sub.2 :yH.sub.2 O:zNH.sub.3wherein M is at least one cation having a valence n, x is at least 10, y/x is from 0 to 5 and z/x is 0-5. The process comprises mixing a source of silica, a source of alumina, a source of alkali metal(s), water and ammonia until a homogeneous gel is formed and crystallizing the gel at a temperature above 70.degree. C. for a period of at least 2 hours.
    Type: Grant
    Filed: September 1, 1983
    Date of Patent: August 6, 1985
    Assignee: The British Petroleum Company p.l.c.
    Inventors: William J. Ball, Sami A. I. Barri, Dennis Young
  • Patent number: 4532120
    Abstract: A process for the removal of and analysis of phosphine and arsine impurities in silane gas. Silane gas which normally contains the impurities of AsH.sub.3 and PH.sub.3 is contacted with a solution of NaAlH.sub.4 in dimethoxyethane, other ether or amine to remove the impurities therefrom. The dimethoxyethane or other ether solution may then be hydrolyzed with water or alcohol to evolve hydrogen gas from the NaAlH.sub.4 and to re-evolve phosphine and arsine which may then be quantitatively determined by gas chromatography, atomic absorption, or other means.
    Type: Grant
    Filed: December 28, 1983
    Date of Patent: July 30, 1985
    Assignee: Ethyl Corporation
    Inventors: Isaac L. Smith, Gunner E. Nelson
  • Patent number: 4530824
    Abstract: An L type zeolite of a high purity is prepared by crystallizing an amorphous sodium alminosilicate compound containing a silicon component in an amount of 67 to 91 wt. % as SiO.sub.2 on the anhydrous basis in an aqueous potassium hydroxide solution.
    Type: Grant
    Filed: October 18, 1983
    Date of Patent: July 23, 1985
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Junji Arika, Keiji Itabashi, Yoshio Tamura
  • Patent number: 4528172
    Abstract: The invention provides a process for the manufacture of zeolites of the ZSM-5 type by heating an aqueous solution or suspension containing a silicon dioxide source, alkali metal hydroxide and optionally an aluminum source until crystallization occurs. Furthermore, the solution or suspension contains an organic phosphorus compound which is selected from the group consisting of OPR.sup.1 R.sup.2 R.sup.3 and PR.sup.1 R.sup.2 R.sup.3, in which R.sup.1, R.sup.2 and R.sup.3, independently from one another, each are alkyl or alkoxy having each from 2 to 10 carbon atoms.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: July 9, 1985
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hans-Peter Rieck, Hans-Jurgen Kalz
  • Patent number: 4526879
    Abstract: As synthesized by conventional technique, zeolite ZSM-5 is crystallized in the presence of substantial amount of tetraalkylammonium cations, the alkyl groups of which contain 2 to 5 carbon atoms, such as, for example, tetrapropylammonium. When synthesized in the conventional way, ZSM-5 contains tetraalkylammonium cations as well as a substantial amount of sodium ions. To obtain a more catalytically active form of ZSM-5, the sodium ions must be exchanged to very low levels. By synthesizing zeolite ZSM-5 according to the present method, i.e., in the presence of a combination of an amine and a halide in the presence of a mutual solvent and with a specifically defined reaction mixture composition, ZSM-5 having different organic nitrogen-containing cations but the same crystal structure as conventionally prepared ZSM-5 is obtained. The ZSM-5 prepared in accordance herewith is very low in sodium content as synthesized and has a crystal size of from about 0.05 microns to about 20 microns.
    Type: Grant
    Filed: August 5, 1983
    Date of Patent: July 2, 1985
    Assignee: Mobil Oil Corporation
    Inventors: Francis G. Dwyer, Pochen Chu
  • Patent number: 4526878
    Abstract: The present invention relates to a new method for supporting a metal and/or a metal oxide on a crystalline aluminosilicate zeolite. The resulting products are useful as catalysts and are designated ZKU-5, ZKU-6 and ZKU-7 (Zeolite Kyoto University catalyst). These catalysts display superior catalytic activity and selectivity and have a longer life than catalysts of the prior art.One method of the invention involves crystallizing a zeolite composition in the presence of both a conditioning agent and a crystal seed supporting the metal and/or metal oxide, the latter providing a nucleus for crystallization. The conditioning agent comprises the lower analogs of a tetraalkyl ammonium cation. The resulting crystal can support one or more metals or metal oxides or a mixture thereof.The disclosure compares the catalysts of the invention with a known, prior art catalyst, namely ZSM-34.
    Type: Grant
    Filed: October 3, 1983
    Date of Patent: July 2, 1985
    Inventors: Yoshinobu Takegami, Tomoyuki Inui
  • Patent number: 4525212
    Abstract: Decontaminating an aluminum melt by chlorination wherein the melt is blanketed with a layer of molten flux containing calcium oxide to consume any Cl.sub.2 and/or AlCl.sub.3 offgasses from the melt.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: June 25, 1985
    Assignee: General Motors Corporation
    Inventor: Ram A. Sharma
  • Patent number: 4524055
    Abstract: A novel crystalline aluminosilicate zeolite characterized by having(a) a silica/alumina mole ratio in the range of from 10 to 100,(b) X-ray lattice distances d shown in Table A in the specification, and(c) a (cyclohexane/n-hexane) adsorption ratio of at least 0.7. This crystalline aluminosilicate zeolite is useful, for example, as a catalyst in the isomerization reaction or transalkylation reaction of alkylbenzenes or alkylnaphthalenes, and can be prepared by heating a crystalline aluminosilicate zeolite ZSM-5 having a silica/alumina mole ratio of from 20 to 300 at a temperature between 80.degree. C. and 250.degree. C. in an aqueous solution containing 0.1 to 1 g, per gram of the ZSM-5 zeolite, of an alkali metal hydroxide.
    Type: Grant
    Filed: February 22, 1983
    Date of Patent: June 18, 1985
    Assignee: Teijin Petrochemical Industries Ltd.
    Inventors: Tamio Onodera, Tokuji Sakai, Yasuo Yamasaki, Koji Sumitani
  • Patent number: 4517169
    Abstract: A method of producing carbon fibers in which an exhaust gas generated in a heat-treating stage of the production of carbon fibers is divided into two portions, one portion thereof being decomposed by the action of an oxidizing catalyst and subsequently being blended with the other portion, to be reused. According to said method, the heat loss in the exhaust gas disposal process can be substantially reduced and the efficiency of heat-treating can be improved and in consequence, various troubles due to the decomposed products contained in the heat-treating atmosphere such as surface damage, fuzziness and individual fiber breakage, etc. can be avoided.
    Type: Grant
    Filed: June 2, 1983
    Date of Patent: May 14, 1985
    Assignee: Toray Industries, Inc.
    Inventors: Atsushi Sumida, Keiichiro Ozaki, Shizuo Watanabe