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| Number | Title | Issue Date |
| 7736607 | Process for metals recovery from spent catalyst The process of this invention is directed to the removal of metals from an unsupported spent catalyst. The catalyst is subjected to leaching reactions. Vanadium is removed as a precipitate, while a solution comprising molybdenum and nickel is subjected to further ex... | 06/15/2010 |
| 7485267 | Process for metals recovery from spent catalyst The process of this invention is directed to the removal of metals from an unsupported spent catalyst. The catalyst is subjected to leaching reactions. Vanadium is removed as a precipitate, while a solution comprising molybdenum and nickel is subjected to further ex... | 02/03/2009 |
| 7361273 | Separation of sugars, sugar alcohols, carbohydrates and mixtures thereof The present invention relates to a method of separating sugars and sugar alcohols from each other. More particularly the present invention relates to the use of a weakly basic anion exchange resin in a chromatographic separation process. The advantage of the present... | 04/22/2008 |
| 7335618 | Method for manufacturing hydrorefining catalyst, and metal recovery method A heavy oil is hydrorefined using a hydrorefining catalyst. A spent hydrorefining catalyst whose activity has decreased is heat treated (S1) and pulverized to obtained a regenerated powder (S2). This regenerated powder is fractionated according to its ... | 02/26/2008 |
| 7288170 | Process for producing a ready-to-use electrolyte A process is intended to allow simple and particularly reliable electrolyte generation and conditioning from metal-containing used electrolytes and/or used process solutions and/or pulverulent metal wastes. For this purpose, waste products containing metal ions from... | 10/30/2007 |
| 7255795 | Process for selectively removing molybdenum from liquid mixtures containing it together with vanadium Process for selectively removing molybdenum from liquid mixtures containing it, in a quantity greater than (200) mg/l, together with vanadium characterized in that it comprises the following steps: bringing the liquid mixture to a pH of less than (3); adding a solut... | 08/14/2007 |
| 7220394 | Process for simultaneous recovery of chromium and iron from chromite ore processing residue The present invention relates to a process for simultaneous recovery of chromium and iron from Chromite Ore Processing Residue (COPR) and more particularly, the present invention relates to an economical and environment-friendly process for recovering chromium as a ... | 05/22/2007 |
| 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 |
| 7169371 | Process for the treatment of molybdenum concentrate A method of treatment or purification of a molybdenum concentrate also containing copper, comprises the step of subjecting the molybdenum concentrate to pressure oxidation in the presence of oxygen and a feed solution containing copper (e.g. CuSO4) and ha... | 01/30/2007 |
| 7166264 | Processes for purifying phosphoric acid and for preparing phosphoric acid A process for purifying phosphoric acid includes removing volatile components from phosphoric acid rich in impurities to form a crude phosphoric acid liquid substantially free of volatile components; heating the crude phosphoric acid liquid to a temperature above 25... | 01/23/2007 |
| 7153377 | Method of separating admixed contaminants from superalloy metal powder A method is provided for separating superalloy metal powder from contaminants, such as process-produced contaminants, by enhancing the magnetic properties thereof in a carburizing atmosphere followed by magnetic separation of the contaminants from the superalloy met... | 12/26/2006 |
| 7122164 | Niobate-based octahedral molecular sieves Niobate-based octahedral molecular sieves having significant activity for multivalent cations and a method for synthesizing such sieves are disclosed. The sieves have a net negatively charged octahedral framework, comprising niobium, oxygen, and octahedrally coordin... | 10/17/2006 |
| 7048857 | Method and apparatus for metal removal ion exchange The present invention provides a method for selectively removing metal ions of interest from a solution (12), such as the wastewater from a chemical mechanical polishing process. The method comprises contacting a solution (12) containing solid particle... | 05/23/2006 |
| 6777511 | Process for producing poly (meth) acrylates having reduced metal content An industrially excellent process for producing a poly(meth)acrylate having a reduced metal content which comprises contacting a mixture of a poly(meth)acrylate and an organic solvent with an acidic aqueous solution, such as an aqueous solution obtained by dissolvin... | 08/17/2004 |
| 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 |
| 6709641 | Method for extracting anions The invention relates to a method of extracting anions based on metals of groups IV B to VIII of the periodic table from aqueous solutions thereof, wherein compounds of general formula are used as extractants, in which a... | 03/23/2004 |
| 6497849 | Synthesis of heteropolyacids This invention relates to a process for purifying a heteropolyacid which comprises: subjecting an aqueous solution comprising (i) the heteropolyacid and (ii) salt impurities to at least one liquid/liquid extraction step with an organic solvent, characteri... | 12/24/2002 |
| 6267936 | Method for effecting solvent extraction of metal ions using hydrocarbon soluble aminomethylene phosphonic acid compounds Solvent extraction of one or more metal ions from an aqueous solution in the presence of hydrocarbon-soluble aminomethylenephosphonic acid derivatives.... | 07/31/2001 |
| 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 |
| 6171563 | Supported liquid membrane process for chromium removal and recovery The present invention is directed toward a two-step process for the removal and recovery of chromium from a feed solution, such as waste water, using supported liquid membranes (SLMs). In the first step of the process, the feed solution, which contains he... | 01/09/2001 |
| 6157036 | System and method for automatically eluting and concentrating a radioisotope A system and method for eluting one or more radioisotope processing elements, such as generators and/or concentration and purification components, with a gas over eluent delivery mechanism is disclosed. The system is adapted to an elution/concentration sy... | 12/05/2000 |
| 6149883 | Pressure oxidation process for the production of molybdenum trioxide from molybdenite Molybdenum trioxide is produced from molybdenite by a pressure oxidation process comprising of the steps of forming an aqueous slurry of molybdenite, pressure oxidizing the slurry to form soluble and insoluble molybdenum species, converting the insoluble ... | 11/21/2000 |
| 6113868 | Process for treating tungstate solutions to reduce molybdenum impurity and other impurity content Tungstate solutions are purified by a precipitation process followed by two anion exchange processes to reduce molybdenum and arsenic impurity content. The precipitation involves acidification of the original highly basic tungstate solution to pH of 7 to ... | 09/05/2000 |
| 5945342 | Method for digesting spent ion exchange resins and recovering actinides therefrom using microwave radiation The present invention relates to methods for digesting diphosphonic acid substituted cation exchange resins that have become loaded with actinides, rare earth metals, or heavy metals, in a way that allows for downstream chromatographic analysis of the ads... | 08/31/1999 |
| 5891407 | Process for producing pure ammonium metallates The present invention relates to a process for the production of pure ammonium metallates of the metals W, Mo, V, Cr and Re, wherein alkaline metal salt solutions are adjusted to a pH value in the range from 5 to 9 by reaction with CO2, these m... | 04/06/1999 |
| 5881358 | Composition for extracting transition metal and method for extracting transition metal using the same A composition for extracting a transition metal which comprises as an active ingredient a cyclic phenol sulfide represented by the following formula (1): ##STR1## wherein X represents a hydrogen atom, a hydrocarbon group, an acyl group, a carbox... | 03/09/1999 |
| 5820844 | Method for the production of a purified MoO3 composition A method for producing purified MoO3 from MoS2. MoS2 is initially oxidized to generate an impure MoO3 product containing metallic contaminants and molybdenum sub-oxides. This product is then slurried with a prim... | 10/13/1998 |
| 5804151 | Process for autoclaving molybdenum disulfide A method for producing MoO3 from MoS2. MoS2 is combined with water to form a slurry which is then combined with at least one oxygen-containing oxidizing gas in a reaction chamber in order to initiate oxidization and conver... | 09/08/1998 |
| 5788844 | Process for removing and recovering ammonia from organic metal extractant solutions in a liquid-liquid metal extraction process A process for removing and recovering ammonia from the organic extraction phase in a metal liquid-liquid extraction process in which at least one ammoniacal aqueous solution (either a leach feed solution containing the metal to be extracted or an aqueous ... | 08/04/1998 |
| 5736112 | Aqueous oxidation of organic molybdenum compounds Molybdenum oxides are recovered from an organic solvent solution of organic molybdenum compounds by adding the organic solvent solution to water and reacting the organic molybdenum compounds therein with oxygen under pressure to convert the organic compon... | 04/07/1998 |
| 5731446 | Molybdenum epoxidation catalyst recovery An aqueous epoxidation process stream containing molybdenum and sodium values and organics is treated for organics removal as by incineration and an aqueous solution containing molybdenum and sodium is recovered, cooled, acidified and contacted with activ... | 03/24/1998 |
| 5682593 | Extraction of acids and metal salts from aqueous solutions with diethyl dodecylphosphonate Use of diethyl dodecylphosphonate (DEDP) for the extraction of acids and metal salts from aqueous solutions.... | 10/28/1997 |
| 5571489 | Process for chromium recovery from aqueous solutions A process for recovery of chromium in an aqueous solution comprising converting the chromium to chromyl chloride, separating the chromyl chloride from the aqueous solution, either as a heavy underlayer, or by extraction into a solvent, purifying the chrom... | 11/05/1996 |
| 5525315 | Process for removing heavy metal ions with a chelating cation exchange resin The invention is for a process of removal of dissolved heavy metal cation contaminants from an organic solution. The process of the invention involves providing a chelating ion exchange resin modified by removal of sodium ions therefrom and contacting sai... | 06/11/1996 |
| 5508010 | Method of separating fission molybdenum In a method of separating fission molybdenum from other fission products, wherein an aqueous solution of the fission molybdenum and the other fission products is supplied to a packet bed of manganese dioxide whereby the fission molybdenum and part of the ... | 04/16/1996 |
| 5478539 | Process for the recovery of metals Metal values (especially uranium values) are extracted from aqueous solutions of metal oxyions in the absence of halogen ion using an imidazole of defined formula. Especially preferred extractants are 1-alkyl imidazoles and benzimidazoles having from 7 to... | 12/26/1995 |
| 5460791 | Method for adsorbing and separating heavy metal elements by using a tannin adsorbent and method of regenerating the adsorbent A method of adsorbing and separating a heavy metal element by using a tannin adsorbent comprising: (a) adjusting the pH of a solution containing a plurality of heavy metal elements to a predetermined pH; (b) contacting the adsorbent with the solution in which ... | 10/24/1995 |
| 5439657 | Molybdenum catalyst separation The present invention relates to the separation of molybdenum from epoxidation process streams by extraction with water insoluble tertiary amine.... | 08/08/1995 |
| 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 |
