Patents Examined by Edward J. Meros
  • Patent number: 4447405
    Abstract: Bromide ions when used as the redox intermediates in the oxidation of arsenic (III) oxide to arsenic (V) acid can be removed from a solution having a major proportion of arsenic acid by treatment with an oxidant selected from H.sub.2 O.sub.2, O.sub.3 or Cr(VI) to oxidize the bromide to bromine followed by purging with air, nitrogen or other inert gas to sweep out the resultant bromine. The bromine can be recovered and recycled to a fresh batch of arsenic (III) oxide.
    Type: Grant
    Filed: August 26, 1982
    Date of Patent: May 8, 1984
    Assignee: Koppers Company, Inc.
    Inventors: Byung K. Ahn, Kenneth A. Morris
  • Patent number: 4447261
    Abstract: A method for separating non-ferrous metals from an iron-containing waste material which includes providing separate contiguous layers of the waste material and a sintering mixture containing a finely divided carbonaceous fuel, passing hot combustion supporting gases, first through the layer of sintering mixture and then through the layer of waste material in a sintering zone under conditions sufficient to sinter the iron containing constituents, and volatilizing off the non-ferrous metals to produce a charge suitable for feeding to a blast furnace.
    Type: Grant
    Filed: November 10, 1981
    Date of Patent: May 8, 1984
    Assignee: Klockner-Humboldt-Deutz AG
    Inventors: Hermann Hilbrans, Chatty Rao
  • Patent number: 4447262
    Abstract: An organic waste containing halogen is destroyed by treatment in a molten salt pool comprising a mixture of a basic alkaline earth metal compound with an alkaline earth metal halide. An oxygen-containing gas is introduced into the pool containing the waste to produce a gaseous combustion product and to cause the halogen present in the waste to react with the basic alkaline earth metal compound to produce additional alkaline earth metal halide.
    Type: Grant
    Filed: May 16, 1983
    Date of Patent: May 8, 1984
    Assignee: Rockwell International Corporation
    Inventors: Richard L. Gay, Arthur L. Kohl, Samuel J. Yosim
  • Patent number: 4445935
    Abstract: The method of the present invention is directed to the recovery of silver from spent photographic fixer solutions and for providing an effluent essentially silver-free that is suitable for discharge into commercial sewage systems. The present method involves the steps of introducing the spent photographic fixer solution into an alkaline hypochlorite solution. The oxidizing conditions of the alkaline hypochlorite solution are maintained during the addition of the fixer solution so that the silver ion complexing agents of thiosulfate and sulfite ions are effectively destroyed. Hydrazine monohydrate is then added to the oxidizing solution to form a reducing solution to effect the formation of a precipitate of silver which can be readily removed by filtration or decanting. Experimental tests indicate that greater than 99.99% of the original silver in the spent photographic fixer can be efficiently removed by practicing the present method.
    Type: Grant
    Filed: December 13, 1982
    Date of Patent: May 1, 1984
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Franz A. Posey, Aloysius A. Palko
  • Patent number: 4444902
    Abstract: A method for enhancing the activity of high silica zeolite, i.e. a zeolite having a silica-to-alumina ratio greater than 100, is disclosed which involves calcining the zeolite, treating same with aluminum fluoride, followed by treating the zeolite with an ammonium salt solution and then calcining the final product in order to obtain a zeolite having enhanced activity.
    Type: Grant
    Filed: December 22, 1981
    Date of Patent: April 24, 1984
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, Joseph N. Miale
  • Patent number: 4444739
    Abstract: An improved process for the production of cyanogen chloride is disclosed according to which liquid hydrocyanic acid and gaseous chlorine are reacted in an aqueous medium. The liquid hydrocyanic acid and chlorine are introduced into a column-shaped reactor via at least one two-component nozzle. The reaction mixture is removed at the head of the column-shaped reactor. Preferably, the hydrocyanic acid is in liquid form and the chlorine is in gaseous form. By the process disclosed, quantitative yields of cyanogen chloride are obtained separately from aqueous solutions of hydrochloric acid of a strength suitable for commercial use.
    Type: Grant
    Filed: April 12, 1982
    Date of Patent: April 24, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinrich Konigshofen, Dieter W. Bruck, Alfred Nierth, Marko Zlokarnik, Hans-Jorg Uhlmann
  • Patent number: 4444738
    Abstract: A process for producing a crystalline aluminosilicate which comprises hydrothermally reacting a starting mixture composed of a silicon compound, an aluminum compound, an alkali metal compound, a compound capable of releasing an organic cation in water, and water, characterized in that said starting mixture comprises at least two colloids having different silicon/aluminum atomic ratios, and that the hydrothermal reaction is carried out, as required, in the presence of a fluorine compound.
    Type: Grant
    Filed: November 23, 1981
    Date of Patent: April 24, 1984
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Takashi Suzuki, Shoichiro Hashimoto, Rieko Nakano
  • Patent number: 4443420
    Abstract: Cubic system boron nitride from rhombohedral system boron nitride is produced by a shock wave compression method. The process comprises applying a thermodynamically stable pressure to rhombohedral system boron nitride to convert it to cubic system boron nitride.
    Type: Grant
    Filed: March 17, 1982
    Date of Patent: April 17, 1984
    Assignee: National Institute for Researches in Inorganic Materials
    Inventors: Tadao Sato, Toshihiko Ishii, Nobuo Setaka
  • Patent number: 4443422
    Abstract: Zeolites of small and uniform size are formed having high magnesium exchange capacities. Zeolite A is disclosed having an average particle size less than 1.7 microns, a calcium carbonate exchange capacity of more than 230 mg calcium carbonate per gram zeolite and a magnesium exchange capacity of more than 140 mg magnesium carbonate per gram zeolite. This zeolite A is produced from a reaction mixture having a water to sodium oxide molar ratio of less than 35:1, and a sodium oxide to silica molar ratio of between 1:1 and 4:1, wherein the silica to alumina molar ratio is greater than 3:1 when the sodium oxide to silica molar ratio is less than 4:3 and the sodium oxide to alumina molar ratio is greater than 4:1 when the sodium oxide to silica molar ratio is greater than 4:3. Zeolite X is disclosed having an average particle size less than 2.
    Type: Grant
    Filed: November 4, 1980
    Date of Patent: April 17, 1984
    Assignee: J. M. Huber Corporation
    Inventor: John A. Kostinko
  • Patent number: 4443253
    Abstract: A process for recovering zinc from zinc-containing sulphidic material also containing iron and from zinc oxide containing material. Zinc-containing sulphidic material is leached under oxidizing conditions at a temperature in the range of from about 130.degree. to about 170.degree. C. in aqueous sulphuric acid solution with an initial stoichiometric excess of sulphuric acid relative to the zinc content of the sulphidic material to form a leach slurry containing dissolved zinc and iron. The leach step is continued until a substantial amount of zinc has been dissolved from the sulphidic material. Zinc oxide containing material is then added to the leach slurry to raise the pH of the slurry to a value in the range of from about 4.5 to about 5.5 to precipitate dissolved iron and form an iron-containing residue and a relatively iron-free leach solution. The residue is separated from the leach solution, and the leach solution is treated to recover zinc.
    Type: Grant
    Filed: September 14, 1982
    Date of Patent: April 17, 1984
    Assignee: Sherritt Gordon Mines Limited
    Inventors: Donald R. Weir, Ian M. Masters
  • Patent number: 4441697
    Abstract: An improved apparatus for recovering silver from a silver-containing solution. The device includes a container having influent and effluent passageways and a filler element composed of a metal above silver in the electromotive force series. The filler is disposed about an elongated core having an aperture in the side thereof. The filler may be formed of steel wire wound in the fashion of a spool about the core. One or more baffles may be situated within the filler to extend the length of the path taken by fluid flowing from the influent passageway through the filler to the core and then through the effluent passageway. Solution flowing through the filler reacts therewith so that silver is deposited within the container. An opening may be provided in the top of the container to permit viewing of the contents to determine whether the capacity of the container has been exhausted or whether the device is operating properly.
    Type: Grant
    Filed: January 29, 1982
    Date of Patent: April 10, 1984
    Assignee: William E. Tipton, Jr.
    Inventors: Donny L. Peterson, Michael L. Butts
  • Patent number: 4442082
    Abstract: Process for producing low cost, high purity solar grade Si wherein a reduction reaction, preferably the reduction of SiF.sub.4, by an alkali metal (Na preferred) is carried out by jetting a spray of reactants into a reaction chamber at a rate and temperature which causes the reaction to take place far enough away from the entry region to avoid plugging of reactants at the entry region and wherein separation in the melt is carried out continuously from the reaction and the Si can be cast directly from the melt.
    Type: Grant
    Filed: December 27, 1982
    Date of Patent: April 10, 1984
    Assignee: SRI International
    Inventor: Angel Sanjurjo
  • Patent number: 4441923
    Abstract: Disclosed is a combinative integrated chemical process using inorganic reactants and yielding, if desired, organic products. The process involves first the production of elemental potassium by the thermal or thermal-reduced pressure decomposition of potassium oxide or potassium sulfide and distillation of the potassium. This elemental potassium is then used to reduce ores or ore concentrates of copper, zinc, lead, magnesium, cadmium, iron, arsenic, antimony or silver to yield one or more of these less active metals in elemental form. Process potassium can also be used to produce hydrogen by reaction with water or potassium hydroxide. This hydrogen is reacted with potassium to produce potassium hydride. Heating the latter with carbon produces potassium acetylide which forms acetylene when treated with water. Acetylene is hydrogenated to ethene or ethane with process hydrogen. Using Wurtz-Fittig reaction conditions, the ethane can be upgraded to a mixture of hydrocarbons boiling in the fuel range.
    Type: Grant
    Filed: January 29, 1982
    Date of Patent: April 10, 1984
    Inventor: Rollan Swanson
  • Patent number: 4442072
    Abstract: Metal values are recovered from ore concentrates by forming a sulfide matte, grindng the matte, leaching with sulfuric acid at elevated temperature to selectively extract nickel and iron, and roasting and leaching the residue with dilute sulfuric acid to selectively extract copper. The residue contains a high concentration of platinum, palladium and gold.
    Type: Grant
    Filed: October 20, 1982
    Date of Patent: April 10, 1984
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Elizabeth G. Baglin, John M. Gomes
  • Patent number: 4440569
    Abstract: A process for recovering zinc from zinc containing sulphidic material which also contains iron together with lead and/or silver includes leaching the material under oxidizing conditions at a temperature in the range of from about 130.degree. to about 170.degree. C. in aqueous sulphuric acid solution with a stoichiometric excess of sulphuric acid relative to the zinc content of the material of from about 40 to about 100% to produce an undissolved residue containing a major proportion of lead and/or silver and a leach solution containing a major proportion of the zinc and iron. The residue is separated from the leach solution and treated to recover lead and/or silver values. The leach solution is treated to recover zinc by feeding the solution to another process in which zinc-containing material is treated to recover zinc and which includes an iron-precipitation step.
    Type: Grant
    Filed: February 22, 1983
    Date of Patent: April 3, 1984
    Assignee: Sherritt Gordon Mines Limited
    Inventors: Donald R. Weir, Ian M. Master
  • Patent number: 4440731
    Abstract: Corrosion inhibiting compositions for use in aqueous absorbent gas-liquid contacting processes for recovering carbon dioxide (CO.sub.2) from industrial gas and oil combustion and partial combustion process flue gases, particularly employing copper carbonate, in combination with one or more of dihydroxyethylglycine, alkali metal permangenate, alkali metal thiocyanate, nickel or bismuth oxides with or without an alkali metal cartonate. The inhibitors are effective in reducing corrosion of metals in contact with the aqueous absorbent in the absorbent regeneration section of the plant as well as reduce the thermal degradation of the absorbent when high oxygen content combustion gases are treated to recover the CO.sub.2.
    Type: Grant
    Filed: September 8, 1981
    Date of Patent: April 3, 1984
    Assignee: The Dow Chemical Company
    Inventor: Roscoe L. Pearce
  • Patent number: 4439409
    Abstract: The present invention relates to a new zeolite material having a composition (molar ratios of the oxides) corresponding to the formula:M.sub.2/n O.Al.sub.2 O.sub.3.(20-150) SiO.sub.2(M represents n-valent cation) to a process for the production thereof using hexamethylene imine and to the use of the zeolite material as a catalyst in the conversion of methanol and/or dimethyl ether to hydrocarbons.
    Type: Grant
    Filed: April 13, 1982
    Date of Patent: March 27, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Lothar Puppe, Jurgen Weisser
  • Patent number: 4439410
    Abstract: Silicon is manufactured from powdered material containing silica by injecting this, optionally together with a reducing agent, into a gas plasma with the help of a carrier gas. Thereafter the silica material thus heated, together with the reducing agent if any and the energy-rich plasma gas, is introduced in a reaction chamber surrounded by solid reducing agent in lump form, so that the silica is caused to melt and is reduced to liquid silicon.
    Type: Grant
    Filed: August 2, 1982
    Date of Patent: March 27, 1984
    Assignee: SKF Steel Engineering Aktiebolag
    Inventors: Sven Santen, John O. Edstrom
  • Patent number: 4439235
    Abstract: A process for removing precious metals from comminuted ores. The process comprises the steps of first contacting comminuted ore with a primary acidic hypochlorite solution, separating the ore from the primary hypochlorite solution and then contacting the separated ore with an aqueous hypochlorite solution having a pH greater than 7.
    Type: Grant
    Filed: June 14, 1982
    Date of Patent: March 27, 1984
    Assignee: James J. Shepard, Jr.
    Inventor: Charles H. Simpson
  • Patent number: 4439412
    Abstract: The present invention relates to a method of catalytic and thermochemical decomposition of hydrogen sulfide gas. A metal chemical catalyst, preferably comprised particularly of iron and other transition metals is employed in a gas fluidized bed reactor in which a substantially constant temperature is maintained to crack the hydrogen sulfide. The sulfur is bound chemically to the chemical catalyst and the hydrogen is sent to a transportation system for recovery. The chemical catalyst can be regenerated by raising the temperature in the gas fluidized bed.
    Type: Grant
    Filed: July 1, 1982
    Date of Patent: March 27, 1984
    Inventors: Leo A. Behie, Dimitrios Berk, P. Raj Bishnoi, William Y. Svrcek