Patents Examined by Edward J. Meros
  • Patent number: 4438084
    Abstract: Hydroxylammonium salts are manufactured by a process comprising the catalytic reduction of nitric oxide with hydrogen in a dilute aqueous mineral acid in the presence of a suspended platinum catalyst at an elevated temperature, wherein the reaction is carried out in vessels of which the walls consist essentially of conventional copper-free molybdenum-containing austenitic chromium-nickel steels which contain from 16 to 28% by weight of chromium, from 10 to 50% by weight of nickel, from 1 to 4% by weight of molybdenum and at most 0.05% by weight of carbon, together with at least 0.05% by weight of nitrogen up to 0.5% by weight.
    Type: Grant
    Filed: December 17, 1982
    Date of Patent: March 20, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Guenther Rapp, Erwin Thomas, Rolf Muenster
  • Patent number: 4438079
    Abstract: Arsenic anhydride of high purity is inexpensively manufactured from an arsenic sulfide-containing substance by first contacting the arsenic sulfide-containing substance with a copper sulfate-containing aqueous solution so as to provide an extract solution containing arsenious acid, the extract solution is subjected to aeration in the presence of copper ions such that the arsenious acid therein is mostly oxidized to arsenic acid, the thus provided treated solution is subjected to a weak reducing agent to cause crystals of arsenious anhydride to form, and these crystals are then recovered.
    Type: Grant
    Filed: March 26, 1982
    Date of Patent: March 20, 1984
    Assignee: Sumitomo Metal Mining Company Limited
    Inventors: Tadashi Nakano, Hiroyuki Tamura, Naoki Kubo
  • Patent number: 4438088
    Abstract: The invention disclosed herein is a method for preparing antimony trifluorodichloride whereby antimony trifluoride is dispersed in a liquid organic medium to form a slurry and contacted with chlorine. The invention further comprises a process for fluorinating a fluorinatable hydrocarbon or halocarbon whereby a fluorinatable hydrocarbon or halocarbon is contacted with the antimony trifluorodichloride prepared in the above process, and the fluorinated product is distilled off.
    Type: Grant
    Filed: March 11, 1982
    Date of Patent: March 20, 1984
    Assignee: The Dow Chemical Company
    Inventor: John D. Weaver
  • Patent number: 4437889
    Abstract: Silver is recovered from photographic wastes, whether liquid (used developing solution) or a solid (used film) in a completely nonelectrolytic system using a series of physical-chemical reactions. With liquid wastes this is done by first heating them above ambient temperature to a temperature between 45.degree. C. and 65.degree. C. and then mixing them with aqueous nitric acid at a concentration of 65% and having a specific density of 1.40 g/ml. The quantity of nitric acid used forms a liquid: acid ratio with the liquid being treated of between 1:10 and 1:6. The mixture is then allowed to macerate for between 0.7 and 1.5 hours while it is continuously filtered. The filtration residue is then subjected to a second heating to about 600.degree.-700.degree. C. until it turns gray, then it is fused in a closed furnace. The fused product is then dumped directly into water to solidify and produce pure silver. For solid wastes the digestion with nitric acid takes place before calcining the solid materials.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: March 20, 1984
    Inventor: Eliodoro Palacios-Mendoza
  • Patent number: 4438076
    Abstract: Gold and/or silver is leached from comminuted ore with an alkaline cyanide lixiviant at a superatmospheric pressure of at least 25 bar and with high purity oxygen (at least 90% pure) to reduce the residence time at high yield.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: March 20, 1984
    Assignees: Metallgesellschaft AG, Vereinigte Aluminum-Werke AG
    Inventors: Hartmut Pietsch, Wolfgang Turke, Ernst Bareuther, Fritz Kampf, Hubert Bings
  • Patent number: 4438083
    Abstract: Process for preparing magnesium nitrate hexahydrate without the need for filtering aids. A process for preparing magnesium nitrate hexahydrate essentially comprises: (a) forming a magnesium oxide or magnesium carbonate suspension in melted magnesium nitrate hexahydrate at a suspension temperature in excess of 90.degree. C.; (b) adding a nitric acid solution to the suspension while stirring thereby forming a reaction mixture containing additional magnesium nitrate hexahydrate; (c) filtering the liquid reaction mixture to obtain a clear magnesium nitrate hexahydrate filtrate; (d) discharging as product a part, corresponding to the amount of magnesium oxide or magnesium carbonate introduced, of the liquid magnesium nitrate hexahydrate obtained as clear filtrate; (e) utilizing the remaining part as liquid medium for the conversion of magnesium oxide or magnesium carbonate with nitric acid.
    Type: Grant
    Filed: September 15, 1982
    Date of Patent: March 20, 1984
    Assignee: Stamicarbon B.V.
    Inventors: Michael H. Willems, Winfried J. W. Vermijs
  • Patent number: 4436708
    Abstract: The present invention relates to a process for producing a crystalline synthetic faujasite of the zeolite "Y" type wherein an activated system is provided by mixing a sodium silicate solution with a seed amount of zeolite "Y" type synthetic faujasite and the activated system is reacted with a sodium aluminate solution under controlled conditions to thereby form a low water reaction mixture or system and then a crystalline synthetic faujasite of the zeolite "Y" type.
    Type: Grant
    Filed: September 7, 1982
    Date of Patent: March 13, 1984
    Assignee: Ethyl Corporation
    Inventor: Robert N. Sanders
  • Patent number: 4435375
    Abstract: A novel type of carbon filaments grow from a purified graphite material when the purified graphite material is heated in a plasma. The carbon filaments thus obtained can be converted into softer graphite filaments. Both the carbon filaments and the graphite filaments as such are extremely useful due to their excellent mechanical strengths. In addition, from each of them, intercalation compounds with an alkali metal can be obtained, which are useful not only as a highly conductive material but also as a catalyst for various reactions.
    Type: Grant
    Filed: September 4, 1981
    Date of Patent: March 6, 1984
    Assignee: Shohei Tamura
    Inventors: Shohei Tamura, Mizuka Sano, Hiroo Inokuchi, Koshiro Toriumi, Naoki Sato
  • Patent number: 4435376
    Abstract: The production of fibrous carbon from hydrocarbons can be improved by employing recycled hydrocarbons as carrier gases.
    Type: Grant
    Filed: March 26, 1982
    Date of Patent: March 6, 1984
    Assignee: Phillips Petroleum Company
    Inventors: Randall A. Porter, Larry E. Reed
  • Patent number: 4435209
    Abstract: A process for the production of silicon or ferrosilicon by reduction of silicon oxide, optionally in the presence of iron or iron oxide, using a carbonaceous reducing agent, in a reduction furnace.
    Type: Grant
    Filed: March 31, 1982
    Date of Patent: March 6, 1984
    Assignee: Kemanord AB
    Inventor: Thomas Johansson
  • Patent number: 4435368
    Abstract: The invention provides a process for the selective dissolution of oxygenated compounds containing at least one non-ferrous metal selected from the group consisting of nickel, zinc, and copper, present in a mixture of oxygenated compounds containing said at least one non-ferrous metal and at least one element selected from the group consisting of lead, cobalt, iron, manganese, and silicon, and comprises suspending the mixture of the oxygenated metallic compounds in an aqueous phase which, preferably, contains chloride and alkaline earth metal ions; treating the resulting aqueous suspension, maintained at a pH exceeding about 1, with chlorine, preferably at a temperature ranging from about 60.degree. C. to the boiling point of the suspension, to selectively solubilize the said at least one non-ferrous metal while the said at least one element remains in an essentially insoluble residue; and separating the aqueous solution containing the dissolved said at least one non-ferrous metal from the insoluble residue.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: March 6, 1984
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Jean-Michel Demarthe, Paolo Fossi, Louis Gandon
  • Patent number: 4435379
    Abstract: A process is described for reacting chlorinated hydrocarbons other than carbon tetrachloride with metal oxides so as to convert essentially all of the carbon atoms to oxides of carbon. This process provides an efficient and economical means for utilizing chlorinated hydrocarbons.
    Type: Grant
    Filed: August 18, 1982
    Date of Patent: March 6, 1984
    Assignee: The Dow Chemical Company
    Inventors: Robert S. Olson, Joseph P. Surls, Jr., Ben F. West
  • Patent number: 4435373
    Abstract: This invention is concerned with the application of fibrous products from platinum group metal or platinum group metal alloys to the oxidation of ammonia in the manufacture, for example, of nitric acid and to the production of hydrogen cyanide in the Andrassow Process. In particular, the invention relates to a catalyst assembly including an agglomeration or assemblage of randomly oriented fibres made from a platinum group metal or an alloy containing at least one platinum group metal, gold or silver. The fibres used in the catalyst assembly are preferably produced by melt extraction or melt spinning processes.
    Type: Grant
    Filed: August 30, 1982
    Date of Patent: March 6, 1984
    Assignee: Johnson, Matthey & Co., Limited
    Inventors: Arthur G. Knapton, Gordon L. Selman
  • Patent number: 4435370
    Abstract: Monocalcium phosphate, phosphoric acid and/or potassium phosphate, calcium fluoride and gypsum are produced in a process involving acidulation of phosphate rock with phosphoric acid, and wherein monocalcium phosphate dissolved in phosphoric acid is formed during acidulation. In important features, insolubles and impurities are removed and a portion of the monocalcium phosphate may be separated and recovered. Alkali metal ion is added to the solution to form alkali metal fluosilicate, such as K.sub.2 SiF.sub.6, is separated and hydrolyzed with calcium ion to form CaF.sub.2 and the solution is recycled as RH.sub.2 PO.sub.4 /H.sub.3 PO.sub.4 for further reaction with fluorides, where R is alkali metal. A portion of the MCP/H.sub.3 PO.sub.4 solution and/or crystallized monocalcium phosphate can then be reacted with potassium sulfate, potassium bisulfate, or mixtures thereof, to form KH.sub.2 PO.sub.4 or KH.sub.2 PO.sub.4 /H.sub.3 PO.sub.4 solutions, and gypsum or with H.sub.2 SO.sub.4 to produce phosphoric acid.
    Type: Grant
    Filed: September 29, 1981
    Date of Patent: March 6, 1984
    Assignee: Pennzoil Company
    Inventors: Dysart E. Holcomb, Erhart K. Drechsel, John B. Sardisco
  • Patent number: 4434002
    Abstract: A process for production of metallic iron by heating ammonium iron fluoride or iron fluoride in a hydrogen stream.
    Type: Grant
    Filed: August 20, 1981
    Date of Patent: February 28, 1984
    Assignee: Solex Research Corporation of Japan
    Inventors: Morio Watanabe, Sanji Nishimura
  • Patent number: 4434149
    Abstract: A novel method of activating carbon is provided comprising contacting the carbon with low temperature aluminum chloride acid melts comprising at least 50 mole percent aluminum chloride and less than 50 mole percent of at least one halide salt capable of exhibiting a liquid state at atmospheric conditions, e.g., sodium chloride. Carbon activated according to the present invention is useful as a reductant of the chlorination of aluminous materials to produce anhydrous aluminum chloride.
    Type: Grant
    Filed: August 30, 1982
    Date of Patent: February 28, 1984
    Assignee: Atlantic Richfield Company
    Inventors: James C. Withers, Raouf O. Loutfy
  • Patent number: 4432959
    Abstract: A process for producing sodium cyanurate in the powdery form is disclosed. In this method, iso cyanuric acid is reacted with sodium carbonate or sodium hydrogencarbonate or a mixture of sodium carbonate and sodium hydrogencarbonate by mixing the raw materials in powdery form and in the presence of water in a range, in which hydrates can be formed from the raw materials at room temperature, while holding the system at a temperature at which free water can be produced.
    Type: Grant
    Filed: August 3, 1982
    Date of Patent: February 21, 1984
    Assignee: Shikoku Chemicals Corporation
    Inventors: Tadao Shimamura, Naoki Kano
  • Patent number: 4432952
    Abstract: A substituted 8-hydroxyquinoline is added to the alphahydroxyoxime extractant, which allows extracting germanium at lower acidity and with a better yield.
    Type: Grant
    Filed: September 22, 1982
    Date of Patent: February 21, 1984
    Assignee: Metallurgie Hoboken-Overpelt
    Inventors: Achille De Schepper, Marc Coussement, Antoine Van Peteghem
  • Patent number: 4432804
    Abstract: A lime material and a siliceous material containing 10 to 40% by weight of alumina are admixed with an alkali solution, and the mixture is subjected to hydrothermal reaction with saturated water vapor at 4 to 40 kg/cm.sup.2 to form tobermorite. The reaction mixture is filtered to separate the tobermorite therefrom. A lime material and a gypsum material are added to the resulting filtrate, and the mixture is reacted at room temperature to a temperature of 90.degree. C. to form ettringite. The alkali filtrate separated from the ettringite is reused for the production of tobermorite.
    Type: Grant
    Filed: March 10, 1981
    Date of Patent: February 21, 1984
    Assignee: Kubota Ltd.
    Inventors: Hideo Tamura, Seiro Ibuki
  • Patent number: 4432951
    Abstract: Germanium is separated from an aqueous solution by means of a substituted 8-hydroxyquinoline extractant.Re-extraction of germanium from the extractant is carried out above 40.degree. C. and with an organic phase: aqueous phase volume ratio less than 1, whereby obtaining a high re-extraction yield.
    Type: Grant
    Filed: September 22, 1982
    Date of Patent: February 21, 1984
    Assignee: Metallurgie Hoboken-Overpelt
    Inventors: Achille De Schepper, Marc Coussement, Antoine Van Peteghem