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| Number | Title | Issue Date |
| 7846404 | Process for separating and recovering base metals from used hydroprocessing catalyst A method is disclosed for separating and recovering base metals from a used hydroprocessing catalyst originating from Group VIB and Group VIII metals and containing at least a Group VB metal. In one embodiment, the used catalyst is contacted with an ammonia leaching... | 12/07/2010 |
| 7837960 | Process for separating and recovering base metals from used hydroprocessing catalyst A method is disclosed for separating and recovering base metals from a used hydroprocessing catalyst originating from Group VIB and Group VIII metals and containing at least a Group VB metal. In one embodiment, the method comprises the steps of: contacting the used ... | 11/23/2010 |
| 7658895 | Process for recovering base metals from spent hydroprocessing catalyst A method for recovering metals from a spent dispersed catalyst originating from a Group VIB metal sulfide catalyst containing at least a Group VB and Group VIII metal for hydrocarbon oil hydroprocessing is disclosed. In one embodiment, the method comprises the steps... | 02/09/2010 |
| 7300492 | Ammonium dodecamolybdomolybdate and method of making A novel molybdenum compound, ammonium dodecamolybdomolybdate (AMM), is described which may be used in the manufacture of molybdenum metal and molybdenum carbide powders. The molybdenum compound is a dodecaheteropoly acid salt having a Keggin-type structure wherein m... | 11/27/2007 |
| 7285247 | Apparatus and method for operating a fuel reformer so as to purge soot therefrom A method of operating a fuel reformer includes advancing a first air/fuel mixture having a first air-to-fuel ratio into the fuel reformer. The method further includes determining if a soot purge is to be performed and generating a purge-soot signal in response there... | 10/23/2007 |
| 7279143 | Plasmatron-catalyst system A plasmatron-catalyst system. The system generates hydrogen-rich gas and comprises a plasmatron and at least one catalyst for receiving an output from the plasmatron to produce hydrogen-rich gas. In a preferred embodiment, the plasmatron receives as an input air, fu... | 10/09/2007 |
| 7273832 | Alkali metal tungstate compositions and uses thereof Fluids, such as completion fluids, containing at least one alkali metal tungstate and optionally at least one chelating agent are described. Methods of removing a filter cake from a well bore surface, which may include one or more alkaline earth metal sulfates, is a... | 09/25/2007 |
| 7244281 | Method and apparatus for trapping and purging soot from a fuel reformer A plasma fuel reformer assembly for producing reformate gas includes a fuel reformer having an air/fuel input assembly, an electrode assembly, and a soot trap positioned downstream of the electrode assembly. The electrode assembly includes a first electrode and a se... | 07/17/2007 |
| 7217366 | Purification of ammonium metallate solutions A process for reducing the content of alkali metal impurities (e.g., potassium) in ammonium metallate solutions is described. The process involves subjecting a feed solution containing ammonium metallate and alkali metal impurities to membrane filtration. The membra... | 05/15/2007 |
| 7182926 | Process for separating and recovering valuable metals A process for economically separating and recovering valuable metal components, with few kinds of chemicals being used, with no waste water that causes environmental pollution being discharged, and also perfectly no by-products being formed by means of simple steps.... | 02/27/2007 |
| 7074381 | Process for producing ammonium polythiomolybdate A process for preparation of an ammonium polythiomolybdate or a hydrate thereof of the formula (NH4)2Mo3S13.n H2O where n is 0, 1 or 2, in which aqueous ammonium monosulfide, elemental sulfur and molybdic oxide ... | 07/11/2006 |
| 6953565 | Process for producing ammonium polythimolybdate A process for producing an ammonium polythiomolybdate of the formula (NH4)2Mo3S13.n H2O where n is 0, 1 or 2 in which an aqueous ammoniacal molybdate solution is reacted with hydrogen sulfide gas in a closed sys... | 10/11/2005 |
| 6793907 | Ammonium dodecamolybdomolybdate and method of making A novel molybdenum compound, ammonium dodecamolybdomolybdate (AMM), is described which may be used in the manufacture of molybdenum metal and molybdenum carbide powders. The molybdenum compound is a dodecaheteropoly acid salt having a Keggin-type structure wherein m... | 09/21/2004 |
| 6730279 | Production of pure molybdenum oxide from low grade molybdeniteconcentrates High purity ammonium dimolybdate or molybdenum oxide is produced by the pressure oxidation of low grade molybdenite concentrates or molybdenum intermediates. The process entails nearly complete oxidation of the sulfide minerals while optimizing the process chemistry... | 05/04/2004 |
| 6653066 | Device and method for detecting polyvalent substances Disclosed is a device and method of use for detecting polyvalent analytes such as antibody to the AIDS virus, utilizing an inverse sandwich method. The test device comprises a first substance having an epitope, bound to a label and capable of moving withi... | 11/25/2003 |
| 6180072 | Process to recover metals from spent catalyst There is provided a process to reclaim metals from catalysts, said process comprising collecting one or more catalyst containing at least one metal sulfide; leaching the catalyst in an atmospheric leach step; separating the leached slurry into a first liq... | 01/30/2001 |
| 5676817 | Process for the production of pure solutions of tungsten and molybdenum Process for the production of pure tungsten and/or molybdenum solutions from sources, such as alkaline decomposition solutions, which are contaminated with tantalum, niobium, titanium, aluminium, tin, arsenic, phosphorus and/or silicon, by application of ... | 10/14/1997 |
| 5431892 | Process for recovering valuable metal from waste catalyst A process for recovering valuable metals from a waste catalyst based on an alumina carrier includes (a) roasting the waste catalyst at a temperature range of 400° to 1,000° C. to obtain a roasted product; (b) preparing a reduction dissolution by dissolv... | 07/11/1995 |
| 5417945 | Process for recovering tungsten as an ammoniacal tungstate compound in which ammoniacal tungstate liquors are reclaimed A process for recovering tungsten as an ammoniacal tungstate which comprises reacting a tungsten containing material with sodium hydroxide to produce sodium tungstate and forming a first aqueous sodium tungstate solution therefrom, crystallizing sodium tu... | 05/23/1995 |
| 5300274 | Method for making molybdenum and sulfur containing compounds A method for preparing molybdenum and sulfur containing compounds of the general formula X2 Mo2 S12.yH.sub.2 O, where X is a cation selected from the group consisting of Na+, K+, R4 N+ | 04/05/1994 |
| 5273726 | Removal of aluminum from ammonium molybdate solution Aluminum is removed from ammonium molybdate solution by the use of Mg+2 in the solution to precipitate out the aluminum.... | 12/28/1993 |
| 5264191 | Quaternary ammonium trihalide and method for dissolution of metal with liquid containing the compound A quaternary ammonium trihalide, a novel compound, represented by the formula: [A--R']+ .multidot.X3- (wherein A stands for a trialkyl-amino radical or a pyridyl radical, R' for an alkyl radical of 6 to 22 carbon atoms, and X f... | 11/23/1993 |
| 5101052 | Molybdenum recovery An epoxidation reaction product formed by the molybdenum catalyzed reaction of propylene with tertiary butyl hydroperoxide to provide propylene oxide and tertiary butyl alcohol is separated by distillation into a propylene fraction, a propylene oxide frac... | 03/31/1992 |
| 5093509 | Removal of trace quantities of molybdenum An epoxidation reaction product formed by the molybdenum catalyzed reaction of propylene with tertiary butyl hydroperoxide to provide propylene oxide and tertiary butyl alcohol is separated by distillation into a propylene fraction, a propylene oxide frac... | 03/03/1992 |
| 5002740 | Process for purifying molybdenum A process is disclosed for purifying molybdenum containing arsenic and phosphorus which involves leaching molybdenum trioxide in an acid at a temperature of above about 70° C. to remove impurities from the molybdenum trioxide and produce a partially puri... | 03/26/1991 |
| 4963336 | Purification of APT Directed to a process for producing a tungsten product of enhanced purity from ammonium paratungstate (APT) with a minimum number of processing steps which comprises mixing the APT with an ammonium solution, autoclaving the mixture at a temperature above ... | 10/16/1990 |
| 4956154 | Selective removal of chromium, nickel, cobalt, copper and lead cations from aqueous effluent solutions Aqueous effluent solutions containing metal cations may be treated with an extractant comprising an organophosphinic acid, a di-2-ethylhexyl phosphoric acid and/or an aliphatic amine to selectively separate chromium, nickel, cobalt, copper and lead cation... | 09/11/1990 |
| 4942024 | Method for refining hydroxides of niobium and tantalum containing transition metals Refining of either niobium hydroxide or tantalum hydroxide containing transition metals as impurities is accomplished easily and economically by dissolving the metal hydroxide in an aqueous solution of either hydrofluoric acid or oxalic acid, adjusting th... | 07/17/1990 |
| 4933152 | Continuous process for purifying molybdenum A process for purifying molybdenum, which comprises first leaching impure molybdenum trioxide containing potassium in a liquid medium of nitric acid, and an ammoniacal liquor, wherein the nitric acid concentration is about 3.5 to 4.0 moles per liter and t... | 06/12/1990 |
| 4919716 | Method for dissolution of metal A metal is dissolved by being brought into contact with at least one halogenated hydrocarbon in the presence of a cationic surfactant.... | 04/24/1990 |
| 4910000 | Method of extracting tungsten values from tungsten containing ores A method of extracting tungsten values from tungsten containing ores comprising step (i) forming a mixture of a tungsten containing ore and a first mineral acid adapted to consume acid consuming substances in the ore and step (ii) thereafter adding organi... | 03/20/1990 |
| 4885144 | Process for purifying molybdenum A process is disclosed for purifying molybdenum which involves adding to an acidic slurry of molybdenum trioxide, a source of magnesium ions in a solid form, with the amount of magnesium and the magnesium ion concentration in the subsequently formed ammon... | 12/05/1989 |
| 4872909 | Process for acid leaching of manganese oxide ores aided by hydrogen peroxide A method of processing manganese ore by adding the ore to an aqueous solution of acid and H2 O2 to form a leach pulp. The leach pulp is agitated for a predetermined time period at predetermined temperatures. The leach pulp is then se... | 10/10/1989 |
| 4814149 | Process for recovering molybdenum from solution in a form that is substantially free from vanadium The present invention is a process for selectively precipitating molybdenum in a form that is substantially free from vanadium impurities. The molybdenum is precipitated in the form of ammonium octamolybdate which has a molybdenum to vanadium ratio of abo... | 03/21/1989 |
| 4804528 | Stripping and recovery of dichromate in electrolytic chlorate systems A process for removing dichromates from chlorate-rich solutions containing hypochlorite and dichromate ions and produced by the electrolysis of brine. The dichromate is reduced in a two-stage process by the addition of ammonia under controlled conditions ... | 02/14/1989 |
| 4762812 | Heavy oil hydroprocess including recovery of molybdenum catalyst A process for the recovery of a spent molybdenum catalyst from a hydroprocess for the upgrading of a nickel and vanadium containing hydrocarbonaceous mineral oil. The nickel and vanadium contaminated molybdenum catalyst is oxidized to convert the metals t... | 08/09/1988 |
| 4741886 | Process for recovering tungsten from tungsten bearing material containing arsenic A process is disclosed for recovering tungsten from tungsten bearing material containing arsenic. The process involves adjusting a water slurry of the material to a pH of less than about 4 with an acid to solubilize the major portion of the tungsten, addi... | 05/03/1988 |
| 4735791 | Process for producing ammonium molybdate from molybdenum trioxide A process is disclosed for producing ammonium molybdate from molybdenum trioxide which involves digesting molybdenum trioxide with ammonia in a sealed vessel equipped with one or more stirrers at a temperature of from about 20° C. to about 80° C., with ... | 04/05/1988 |
| 4702895 | Purification of molybdenum A method is disclosed for purifying molybdenum which involves adding to an ammoniacal ammonium molybdate solution containing the impurities of phosphorus and arsenic with the phosphorus concentration being from about 0.01 to about 0.12 g/l, a soluble magn... | 10/27/1987 |
| 4654131 | Recovery of tungsten valves from alkaline solutions A method of removing sodium ions from an alkaline aqueous solution such as a leach solution which contains dissolved sodium tungstate. The method involves passing the solutions through the anode compartment of an electrolytic cell and passing an electrica... | 03/31/1987 |
