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| Number | Title | Issue Date |
| 7767188 | Calcium-sodium polysulfide chemical reagent and production methods A calcium-sodium polysulfide chemical reagent and methods for producing the reagent. The reagent is a blend of calcium polysulfide and sodium polysulfide that can be prepared using various types, sources and ratios of lime, elemental sulfur and sulfide ion using eit... | 08/03/2010 |
| 7534413 | Calcium-sodium polysulfide chemical reagent and production methods A calcium-sodium polysulfide chemical reagent and methods for producing the reagent. The reagent is a blend of calcium polysulfide and sodium polysulfide that can be prepared using various types, sources and ratios of lime, elemental sulfur and sulfide ion using eit... | 05/19/2009 |
| 7371307 | Kraft pulp yield by heat treatment of polysulphide liquors generated by oxidation Oxidized white liquor is heat treated to increase the concentration of polysulphide measured at 285 or 286 nm (PSUV) or measured at 416 nm (PSVIS) and the PSUV/PSGR or PSVIS/PSGR ratio, whereby the co... | 05/13/2008 |
| 7326346 | High capacity regenerable sorbent for removal of arsenic and other toxic ions from drinking water The present invention is directed to a sorbent comprising a disordered polyvalent metal oxide on the surface of an inert substrate. The substrate can be a layered silicate, such as vermiculite, an aluminosilicate such as montmorillonite, or a nonlayered silicate suc... | 02/05/2008 |
| 7183235 | High capacity regenerable sorbent for removing arsenic and other toxic ions from drinking water The present invention is directed to a sorbent comprising a disordered polyvalent metal oxide on the surface of an inert substrate. The substrate can be a layered silicate, such as vermiculite, an aluminosilicate such as montmorillonite, or a nonlayered silicate suc... | 02/27/2007 |
| 7048781 | Chemically-impregnated silicate agents for mercury control The present invention is directed to a contaminant removal agent comprising a polyvalent metal sulfide on the surface of an inert substrate. The substrate can be a layered silicate, such as vermiculite, an aluminosilicate such as montmorillonite, or a nonlayered sil... | 05/23/2006 |
| 6984368 | Process for preparing calcium thiosulfate solution An efficient process to produce calcium thiosulfate (CaS2O3) from lime, sulfur and oxygen is described. By selecting appropriate process conditions such as mole ratios of lime to sulfur, temperature and pressure of the reaction process and the ... | 01/10/2006 |
| 6942840 | Method for removal and stabilization of mercury in mercury-containing gas streams The present invention is directed to a process and apparatus for removing and stabilizing mercury from mercury-containing gas streams. A gas stream containing vapor phase elemental and/or speciated mercury is contacted with reagent, such as an oxygen-containing oxid... | 09/13/2005 |
| 6911570 | Method for fixating sludges and soils contaminated with mercury and other heavy metals The invention relates to a method, composition and apparatus for stabilizing mercury and other heavy metals present in a particulate material such that the metals will not leach from the particulate material. The method generally involves the application of a metal ... | 06/28/2005 |
| 6875414 | Polysulfide measurement methods using colormetric techniques Methods of converting a sulfide in a composition to polysulfide are described, one method comprising the steps of exposing the composition to conditions and for a time sufficient to cause conversion of at least a portion of the sulfide, to polysulfide to form a modi... | 04/05/2005 |
| 6866748 | Process for preparing polysulfides using clarified white liquor The present invention provides a process for preparing polysulfide. More particularly, the process of the present invention allows one to prepare the amount of polysulfide needed using clarified white liquor, and to be used when and where it is needed during the coo... | 03/15/2005 |
| 6605234 | Polysulfide solutions and hydroxalkylaminium ions for stabilizing elemental sulfur Hydroxalkylaminium polysulfides are used to provide cold stability to ammonium polysulfide solutions. Hydroxyalkylaminium sulfides or polysulfides also are used to solubilize unwanted sulfur. Preferred aminium ions are monohydroxyalkylaminium ions, prefer... | 08/12/2003 |
| 6544492 | Regeneration method for process which removes hydrogen sulfide from gas streams A process is provided for the removal of hydrogen sulfide out of a gaseous stream (22), such as a natural gas, by contacting the hydrogen sulfide containing gas with a sorbing liquid (26) containing a tertiary amine so that the hydrogen sulfide is sorbed ... | 04/08/2003 |
| 6451729 | Method for preparing a highly active, unsupported high surface-area MoS2 catalyst The present invention is a new and simple method of decomposing ammonium tetrathiomolybdate (ATTM) in an organic solvent with added water under H2 pressure. Model compound reactions of 4-(1-naphthylmethyl)bibenzyl (NMBB) were carried out at 350... | 09/17/2002 |
| 6264819 | Method for producing polysulfide by electrolytic oxidation It is an object of the present invention to produce a cooking liquor containing polysulfide sulfur at a high concentration from white liquor in a pulp production process with a high selectivity at a low electric power with very little production of thiosu... | 07/24/2001 |
| 6156693 | Method for preparing a highly active, unsupported high-surface-area ub . MoS.s2 catalyst The present invention is a new and simple method of decomposing ammonium tetrathiomolybdate (ATTM) in an organic solvent with added water under H2 pressure. Model compound reactions of 4-(1-naphthylmethyl)bibenzyl (NMBB) were carried out at 350... | 12/05/2000 |
| 5993601 | Process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking The invention relates to a process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking. The process is characterized in that green liquor is firstly enriched in sulphide and then oxidized.... | 11/30/1999 |
| 5972197 | Method for producing polysulfides by electrolytic oxidation A method for producing polysulfides, which comprises introducing a solution containing sulfide ions into an anode compartment of an electrolytic cell comprising the anode compartment provided with a porous anode, of which at least the surface is made of c... | 10/26/1999 |
| 5958281 | Lithium ion-conductive solid electrolyte and method for producing the same A method for producing an electrochemically advantageous lithium ion-conductive solid electrolyte with high ionic conductivity, low electronic conduction and electrochemical stability is disclosed. The method comprises the steps of synthesizing lithium su... | 09/28/1999 |
| 5863268 | Metal goalkeeper's hockey stick An ice hockey stick comprising a blade and an elongate, narrow handle connected to a top end of the blade. The handle and blade are formed from a strong, lightweight metal such as aluminum alloy. The blade has a number of relatively small holes extending ... | 01/26/1999 |
| 5762807 | Composition and process for treating water and gas streams containing heavy metals and other pollutants A composition for treating water or flue gases that contains metal ions and possibly also organic and/or inorganic compounds is produced by reacting sulfur with an alkali- and/or alkaline earth metal hydroxide in the presence of water. The inventive compo... | 06/09/1998 |
| 5686056 | Methods and apparatus for purifying hydrogen sulfide The invention provides methods for purifying hydrogen sulfide gas having impurities therein. In one exemplary method, the hydrogen sulfide gas is purified by passing the gas through a filter media, with at least some of the impurities being trapped within... | 11/11/1997 |
| 5478541 | Separately removing mercaptans and hydrogen sulfide from gas streams The present invention provides a method for separately removing mercaptans and hydrogen sulfide from a hydrocarbon gas stream by passing the gas through a bed which includes iron oxide which catalyzes the formation of disulfides and trisulfides from merca... | 12/26/1995 |
| 5455206 | Corrosion resistant ceramic materials Ceramic materials which exhibit stability in severely-corrosive environments having high alkali-metal activity, high sulfur/sulfide activity and/or molten halides at temperatures of 200°-550° C. or organic salt (including SO2 and SO2 | 10/03/1995 |
| 5451327 | Compound and method for treating water containing metal ions and organic and/or inorganic impurities A composition for treating water that contains metal ions and possibly also organic and/or inorganic compounds is produced by reacting sulfur with an alkali- and/or alkaline earth metal hydroxide in the presence of water. The inventive composition corresponds ... | 09/19/1995 |
| 5376749 | Stabilized ammonium polysulfide solutions and process utilizing same A stabilized ammonium polysulfide solution comprising an aqueous solution of ammonium polysulfide and a stabilizing amount of a water soluble, stabilizing compound that can be an azacyclic compound, a compound having the formula R--O--(Cn H | 12/27/1994 |
| 5279801 | Production of binary rare earth/sulfur or transition metal/sulfur compounds Binary rare earth/sulfur or transition metal/sulfur compounds, e.g., the higher sulfides or sesquisulfides of the rare earths, are prepared by confinedly reacting either a rare earth compound, e.g., an oxide, carbonate or hydroxide, or a transition metal ... | 01/18/1994 |
| 5242672 | Process for removing sulfur from organic polysulfides A process for removing sulfur from an organic polysulfide by reaction with an aqueous stripping solution of at least one sulfide salt and/or hydrosulfide salt in a multi-stage, continuous, countercurrent flow, reaction system wherein the sulfur is strippe... | 09/07/1993 |
| 5157009 | Catalyst for hydrorefining hydrocarbon feedstocks containing niobium trisulphide Catalyst for hydrorefining hydrocarbon feedstocks consisting of niobium trisulphide, bulk or deposited on an inert support. This catalyst is particularly efficient for the reactions of scission of carbon-nitrogen and carbon-sulphur bonds.... | 10/20/1992 |
| 5080881 | Method of preparing lower sodium polysulfides from higher sodium polysulfides and sodium Methods for the preparation of lower sodium polysulfides such as sodium disulfide from higher sodium polysulfides and sodium. To this end, either molten sodium polysulfide placed in a receiver is reacted with sodium in a stoichiometric ratio corresponding... | 01/14/1992 |
| 5075098 | Method of preparing Na2 S (II) A method of preparing sodium monosulfide by means of reacting a sodium polysulfide with sodium under protective gas, the sodium polysulfide is placed in a first stage in a finely distributed, solid state in a receiver, preheated to temperatures of 100°-1... | 12/24/1991 |
| 4976937 | Sulfur dioxide removal from flue gases with sulfite oxidation inhibition A method for removing sulfur dioxide from flue gases in a wet scrubbing system where calcium thiosulfate and calcium polysulfides are formed by the reaction of lime and emulsified sulfur and the mixture added to a recycle tank of the wet scrubber where it... | 12/11/1990 |
| 4855123 | Method of oxidizing sulfide-containing liquor A method of treating an aqueous sodium sulfide solution, such as white liquor in kraft pulping systems, for the oxidation of the sulfide with oxygen in the presence of a specific activated carbon catalyst which is (a) a particulate activated carbon cataly... | 08/08/1989 |
| 4735790 | Antimony thioantimonate lubricant additive and preparation Method of preparing SbSbS4 product having a low level of free sulfur impurity, which includes mixing aqueous solutions of an alkali metal thioantimonate and a halide stabilized antimony trihalide to form a reaction mixture, while maintaining th... | 04/05/1988 |
| 4722832 | Sulfur recovery process A process for the recovery of sulfur from sulfur-bearing ores employing an aqueous leaching solution containing calcium monosulfide, calcium hydrosulfide or mixtures of such calcium sulfide species. The sulfur ore is contacted in an extraction zone with t... | 02/02/1988 |
| 4684515 | Single crystal article A single crystal is prepared by drawing up a single crystal by the Czochralski process and cooling it at a temperature not lower than 600° C. in vacuo. In this manner a single crystal having a dislocation density of 1.5×104 cm2 or ... | 08/04/1987 |
| 4675168 | Antimony thioantimonate and intermediate preparation for lubricant additive Method of preparing alkali metal or ammonium thioantimonate and use of the thioantimonate in the preparation of SbSbS4, having a low level of free sulfur, and lubricants incorporating the SbSbS4 as an additive.... | 06/23/1987 |
| 4640832 | Process for the production of sodium polysulfides from the elements sodium and sulfur There is described a process for the production of pure sodium polysulfides directly from the elements sodium and sulfur. For this purpose, the sodium and the sulfur under a protective gas and in a stoichiometrical ratio corresponding to the desired polys... | 02/03/1987 |
| 4382011 | Composition of matter useful in flue gas desulfurization process Flue gas having a content of sulfur dioxide is passed upwardly through a scrubbing tower against a descending flow of recycled aqueous sodium aluminate-sodium hydroxide liquor. The sulfur dioxide in the gas is converted to sodium and aluminum sulfates and... | 05/03/1983 |
| 4366131 | Highly reactive iron oxide agents and apparatus for hydrogen sulfide scavenging Substantially dry iron oxide particles having a high surface area, a high kinetic "K" value and composed of a crystalline phase of Fe3 O4 together with an amorphous Fe2 O3 moiety or portion and having a surface ... | 12/28/1982 |
