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| Number | Title | Issue Date |
| 8052947 | Method for selective separation of trivalent and tetravalent actinoids from trivalent lanthanoids using hybrid donor type extractant having functional group carrying active oxygen and nitrogen atoms A method for separating and recovering trivalent and tetravalent actinoids in a simple and less costly manner without using an organophosphorus compound is provided. This method selectively separates and recovers the tetravalent actinoid plutonium Pu (IV) and the tr... | 11/08/2011 |
| 7968064 | Method for extraction of metals by methyliminobisalkylacetamide The present invention provides a method for extraction of metals selected from Cr, Mo, Pd, Tc, W, Re, and Pu using a new extractant of methyliminobisalkylacetamide represented by a formula (I): CH3—N—(CH2CONR2)2 | 06/28/2011 |
| 7854907 | Process for the extraction of technetium from uranium A spent fuel reprocessing method contacts an aqueous solution containing Technetium(V) and uranyl with an acidic solution comprising hydroxylamine hydrochloride or acetohydroxamic acid to reduce Tc(V) to Tc(II, and then extracts the uranyl with an organic phase, lea... | 12/21/2010 |
| 7704468 | Method for forming an extraction agent for the separation of actinides from lanthanides An extraction agent for the separation of trivalent actinides from lanthanides in an acidic media and a method for forming same are described, and wherein the methodology produces a stable regiospecific and/or stereospecific dithiophosphinic acid that can operate in... | 04/27/2010 |
| 7291565 | Method and system for treating a substrate with a high pressure fluid using fluorosilicic acid A method and system is described for treating a substrate with a high pressure fluid, such as carbon dioxide in a supercritical state. A process chemistry is introduced to the high pressure fluid for treating the substrate surface. The process chemistry comprises fl... | 11/06/2007 |
| 7187744 | Method of providing a nuclear fuel and a fuel element provided by such a method A method for providing a nuclear fuel includes forming a uranium-molybdenum alloy that provides an enhanced reactivity in research, test and radioisotope production nuclear reactors. In this uranium-molybdenum alloy, the uranium is enriched in the isotope 235-U, whi... | 03/06/2007 |
| 7157003 | Cyclic method for separating chemical elements present in an aqueous solution The invention concerns a cyclic method for separating at least one chemical element E1 from at least one chemical element E2 from an aqueous solution containing said elements, which employs a mixture of two extractants operating in non-overlapping chem... | 01/02/2007 |
| 7101822 | Method for decontaminating solid iodine filters The invention relates to a process for decontaminating solid iodine filters containing silver iodide, silver iodate and/or physisorbed molecular iodine. This process consists in placing the filter in contact with an aqueous solution of a reducing agent chosen... | 09/05/2006 |
| 7063792 | Method for separating metals such as zirconium and hafnium A method for separating a metal (a) from a metal (2), preferably zirconium from hafnium, which consists in dissolving said metals in an aqueous solution wherein said metals are in a state preventing them from passing through a nanofiltration membrane; treating the a... | 06/20/2006 |
| 7060422 | Method of supercritical processing of a workpiece An apparatus for supercritical processing and non-supercritical processing of a workpiece comprises a transfer module, a supercritical processing module, a non-supercritical processing module, and a robot. The transfer module includes an entrance. The supercritical ... | 06/13/2006 |
| 7044662 | Developing photoresist with supercritical fluid and developer An apparatus for developing a polymeric film without the need for a water rinse step is disclosed. An object having a surface supporting a polymeric film is placed onto a support region within a pressure chamber of the apparatus. A fluid and developer is introduced ... | 05/16/2006 |
| 7015256 | Composition for forming photosensitive dielectric material, and transfer film, dielectric material and electronic parts using the same A photosensitive composition for forming a dielectric of the present invention comprising inorganic particles, an alkali developable resin and additives, wherein the additives comprise a compound having a quinonediazido group (C1), a compound containing at least two... | 03/21/2006 |
| 6953120 | Method of recovering metal and/or oxide thereof in a slurry and tailings obtained from said method A method of recovering metal and/or oxide thereof from a slurry is described. The method involves magnetically separating at least a portion of any magnetic impurities from the slurry and then leaching or dissolving at least a portion of any remaining magnetic impur... | 10/11/2005 |
| 6926012 | Method for supercritical processing of multiple workpieces An apparatus for supercritical processing of multiple workpieces comprises a transfer module, first and second supercritical processing modules, and a robot. The transfer module includes an entrance. The first and second supercritical processing modules are coupled ... | 08/09/2005 |
| 6780384 | Method and system for recovering zirconium values from a hard rock ore containing uranium A method of recovering zirconium values from an ore containing zircon, baddeleyite, and uranium is disclosed. The method includes fusing the ore with soda ash and contacting the resulting fused ore with sulfuric acid, which generates an acid leach liquor that contai... | 08/24/2004 |
| 6630114 | Calixarene derivatives, preparation method and use of said derivatives to extract antinides and lathanides The invention relates to new calixarenes according to the formula: ##STR1## wherein R1 and R2, which may be identical or different, are alkyl, alkoxy or aryl groups, and n is an integer equal to 2, 3 or 4. Said calixarenes may be used to ... | 10/07/2003 |
| 6623710 | Nuclear fuel reprocessing A spent fuel reprocessing method including the steps of partitioning U and Pu(III) in a solvent by solvent extraction and subsequently polishing the solvent in a neptunium rejection operation for removing Np therefrom. The solvent obtained from the neptun... | 09/23/2003 |
| 6533938 | Polymer enhanced diafiltration: filtration using PGA A method is describe for removing metal ions of interest from aqueous solutions containing low concentrations of the metal ions of interest. The method involves the use of a microbially produced polymer, γ-glutamic acid. The polymer is used in conjunctio... | 03/18/2003 |
| 6468445 | Solvent for the simultaneous recovery of radionuclides from liquid radioactive wastes The present invention relates to solvents, and methods, for selectively extracting and recovering radionuclides, especially cesium and strontium, rare earths and actinides from liquid radioactive wastes. More specifically, the invention relates to extract... | 10/22/2002 |
| 6444182 | Nuclear fuel reprocessing using hydrophilic substituted hydroxylamines The spent nuclear fuel reprocessing method includes contacting an organic phase containing Np(VI) with a hydrophilic substituted hydroxylamine in which at least one N--H hydrogen of the hydroxylamine is replaced by an organic substituent, there being at l... | 09/03/2002 |
| 6413482 | Method for reprocessing nuclear fuel by employing oximes A spent nuclear fuel reprocessing method includes contacting an organic phase containing NP(VI) with an oxime of the formula R2 C.dbd.NOH, where each R is independently H or an organic substituent. Np(VI) is reduced to Np(V) which is then backw... | 07/02/2002 |
| 6379634 | Ionic liquids as solvents A method of dissolving in an ionic liquid a metal in an initial oxidation state below its maximum oxidation state, characterized in that the ionic liquid reacts with the metal and oxidizes it to a higher oxidation state. The initial metal may be in the fo... | 04/30/2002 |
| 6312653 | Method for separating actinides and lanthanides by liquid-liquid extraction using calixarenes The invention involves a process for separating actinides and lanthanides by liquid-liquid extraction by means of calixarenes. These calixarenes have the formula: ##STR1## with R1 and R2 being alkyl groups or o-nitrophenoxy alkyl groups ... | 11/06/2001 |
| 6306355 | Method for separating actinides and lanthanides by membrane transport using a calixarene The invention involves the separation of actinides and lanthanides by membrane transport by means of a calixarene. To this end, a first aqueous solution containing at least one metal from the group of actinides and lanthanides to be separated is placed in... | 10/23/2001 |
| 6093375 | Nuclear fuel reprocessing A spent fuel reprocessing method includes at least the formation of an aqueous solution and at least one solvent extraction step. Formohydroxarmic acid is used to reduce any Np(VI) to Np(V) and/or to form a complex with Np(IV). As a result, substantially ... | 07/25/2000 |
| 6075130 | Ion binding compounds, radionuclide complexes, methods of making radionuclide complexes, methods of extracting radionuclides, and methods of delivering radionuclides to target locations The invention pertains to compounds for binding lanthanide ions and actinide ions. The invention further pertains to compounds for binding radionuclides, and to methods of making radionuclide complexes. Also, the invention pertains to methods of extractin... | 06/13/2000 |
| 5966584 | Method of separating trivalent actinides from trivalent lanthanides Trivalent actinides can be separated from trivalent lanthanides in aqueous solutions at H+ concentrations of 2 mol/l to 0.001 mol/liter by extraction with bis(aryl)dithiophosphinic acid and a synergist such as TBP, TOPO and TBPO in an organic ... | 10/12/1999 |
| 5926687 | Crown calix |4| arenes, their preparation process and their use for the selective extraction of cesium and actinides The invention relates to crown calix|4|arenes, their preparation process and their use for the selective extraction of cesium and actinides. These crown calixl4larenes comply with the formula: ##STR1## in which R1 represents a group of for... | 07/20/1999 |
| 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 |
| 5866087 | Calixarene derivatives, their preparation process and their use for extracting actinides and lanthanides The invention relates to novel calixarenes of formula: ##STR1## in which m is equal to 0 or 1, n is an integer from 2 to 8, with 4ࣘn(m+1)ࣘ8, R1 and R2, which can be the same or different, are alkyl or O-nitrophenoxyalkyl gro... | 02/02/1999 |
| 5826161 | Process for the selective separation of actinides (III) and lanthanides (III) The present invention relates to a process for the selective separation of actinides (III) and lanthanides (III) from a reaction medium containing them. More specifically, the invention permits a selective extraction of actinides (III) by using an aqueous... | 10/20/1998 |
| 5787332 | Process for recovering tantalum and/or niobium compounds from composites containing a variety of metal compounds A process for treating composite materials comprising metals and having significant radioactivity for separation into concentrated individual products is provided. The process of the invention recovers valuable metals and semi-metal elements including rar... | 07/28/1998 |
| 5766478 | Water-soluble polymers for recovery of metal ions from aqueous streams A process of selectively separating a target metal contained in an aqueous solution by contacting the aqueous solution containing a target metal with an aqueous solution including a water-soluble polymer capable of binding with the target metal for suffic... | 06/16/1998 |
| 5758255 | Opposite phase entrainment reduction in solvent extraction/electrowinning circuits by addition of water soluble cationic polymers A method of reducing the entrainment of aqueous mineral acid solutions in organic extractants used in the solvent extraction of metals from the aqueous fluid is disclosed. The method comprises adding an effective, entrainment prevention amount of a water ... | 05/26/1998 |
| 5678242 | Membrane extraction with thermodynamically unstable diphosphonic acid derivatives Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and vinylidene-1,1-diphosphonic acid, are capable of complexing with m... | 10/14/1997 |
| 5607591 | Bis-crown calix [4]arenes, their preparation process and their use for the selective extraction of cesium and actinides The invention relates to bis-crown calix[4]arenes, their preparation process and their use for the selective extraction of cesium and actinides. Bis-crown calix[4]arenes are in accordance with the formula: ##STR1## in which R1 and R2 | 03/04/1997 |
| 5510091 | Method of separating transplutonium elements from lanthanides in acidic solutions by solvent extraction The improved method of separating transplutonium elements from lanthanides comprises the steps of adding an organic solvent containing an N-heterocyclic compound and a hydrophobic anion to an acidic aqueous solution containing both a lanthanide and a tran... | 04/23/1996 |
| 5510090 | Process for the selective extraction (III) actinides by means of amides having a nitrogenous heterocyclic substituent The invention relates to a process for the selective extraction of (III) actinides by means of amides having a nitrogenous heterocyclic substituent of formula: ##STR1## in which R1 is an alkyl or alkoxy group or a hydrogen atom, R2 | 04/23/1996 |
| 5468456 | Batch extracting process using magneticparticle held solvents A process for selectively removing metal values which may include catalytic values from a mixture containing same, wherein a magnetic particle is contacted with a liquid solvent which selectively dissolves the metal values to absorb the liquid solvent ont... | 11/21/1995 |
| 5419880 | Controlled acid-strong acid strip process A controlled multi-stage process for the stripping of uranium includes the introduction at one end of a solvent extraction device a uranium loaded organic solution. A concentrated stripping acidic aqueous solution is introduced at the other end of the sol... | 05/30/1995 |
