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| Number | Title | Issue Date |
| 8034318 | Process for preparation of calcium thiosulfate liquid solution from lime, sulfur, and sulfur dioxide An efficient batch or semi-continuous method of production of relative high concentration, low byproduct-containing, calcium thiosulfate (CaS2O3) from lime, sulfur or calcium polysulfide, and sulfur dioxide under elevated reaction temperature c... | 10/11/2011 |
| 7927576 | ATS tail gas treating process for SRU and SWS off gases The present invention relates to a system and process utilizing ammonium thio sulfate solution (ATS) as the primary liquid absorption agent that is re-circulated through an SO2 Contactor/Absorber for high efficiency contacting and absorption of sulfur dioxide, SO | 04/19/2011 |
| 7914763 | Process and apparatus for preparing manganese thiosulfate (MnTS) solution An efficient semi-continuous preparation of manganese thiosulfate (MnS2O3, MnTS) from manganese hydrosulfite and sulfur at elevated temperature is described. Manganese hydrosulfite is prepared from commercial manganese carbonate and sulfur diox... | 03/29/2011 |
| 7824652 | ATS tail gas treating process for SRU and SWS off gases The present invention relates to a system and process utilizing ammonium thiosulfate solution (ATS) as the primary liquid absorption agent that is re-circulated through an SO2 Contactor/Absorber for high efficiency contacting and absorption of sulfur dioxide, SO | 11/02/2010 |
| 7655211 | Process for producing ammonium thiosulfate Process for the production of ammonium thiosulfate from gas streams comprising ammonia and hydrogen sulfide. One embodiment of the invention provides absorbing SO2 into a solution of ammonium sulfite and then contacting gaseous feed streams with portions ... | 02/02/2010 |
| 7052669 | Process for production of ammonium thiosulphate A process for continuous production of ammonium thiosulphate, (NH4)2S2O3 (ATS) from NH3, H2S and SO2 is disclosed. A first feed stream comprising H2O, H2S and NH3... | 05/30/2006 |
| 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 |
| 6921523 | Magnesium thiosulfate solution and process for preparing same An efficient process for the preparation of magnesium thiosulfate involves reaction of magnesium hydrosulfite and sulfur at elevated temperature. Magnesium hydrosulfite can be prepared from commercial magnesium oxide and sulfur. Sulfur dioxide can be used to maintai... | 07/26/2005 |
| 6558646 | Method for increasing the lifetime of stretford solution A method is provided for increasing the lifetime of Stretford solution by reducing or eliminating the generation of undesirable thiosulfate salts. The method has three major aspects. First, thiocyanate is added to the Stretford solution. Second, the conce... | 05/06/2003 |
| 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 |
| 6534030 | Process for producing ammonium thiosulfate A process for producing ammonium thiosulfate by contacting a feed gas containing hydrogen sulfide and ammonia with an aqueous absorbing stream containing ammonium sulfite and ammonium bisulfite to form an ammonium thiosulfate-containing solution; the abso... | 03/18/2003 |
| 6159440 | Process for production of ammonium thiosulphate A process for continuous production of ammonium thiosulphate from H2 S, SO2, and NH3 comprising steps of producing in a first absorption step a solution of ammonium hydrogen sulphite by contacting a first gas stream compri... | 12/12/2000 |
| 5944868 | Production of liquid fertilizers by ion exchange Ion exchange is used to make two grades of liquid fertilizer. In the first phase, ammonium thiosulfate (ATS) is contacted with a potassium-containing ion exchange resin to make the liquid fertilizer potassium thiosulfate (KTS) and an ammonium-containing r... | 08/31/1999 |
| 5879830 | Process for regenerating sodium sulphide from the sodium sulphate which forms in treating lead paste from exhausted batteries A process is disclosed for treating lead paste from exhausted batteries. Calcium sulfite and calcium thiosulfite are formed by the reaction: 3Ca(OH)2 +4S°.fwdarw.2CaS+CaS2 O3 +3H2 O(1). The CaS and CaS2 O... | 03/09/1999 |
| 5543122 | Process for the removal of h2 S from non-condensible gas streams and from steam A process for treating non-condensible gas streams containing H2 S, and for treating steam containing H2 S, is disclosed, the process being characterized by unique division of the noncondensible stream, or of a separated non-condensi... | 08/06/1996 |
| 5382322 | Selective white liquor oxidation A method for white liquor oxidation in a kraft mill utilizes a two-stage selective oxidation system in which the first stage is operated to remove sulfide while the second stage is operated to oxidize a significant fraction of the remaining oxidizable sul... | 01/17/1995 |
| 5141730 | Stabilization of hydroxylamine solutions Solutions of an hydroxylamine or an at least partially neutralized hydroxylamine salt are stabilized against decomposition by adding thereto a water-soluble alkali metal, alkaline earth metal or ammonium thiosulfate.... | 08/25/1992 |
| 4960575 | Removal of hydrogen sulfide with on site generated sulfite from geothermal steam Geothermal steam is condensed with a sulfite solution to abate hydrogen sulfide. A portion of the hydrogen sulfide is converted in the condensation in the presence of soluble cationic polymeric catalysts to soluble sulfur compounds while avoiding elementa... | 10/02/1990 |
| 4853136 | Process for oxidizing substances dissolved or in suspension in an aqueous solution The process comprises injecting into the inlet of a polyphase tubular reactor (6), on one hand, the aqueous solution at such temperature that the oxidation reaction occurs at a temperature between 50° C. and 370° C. and at an absolute pressure Pe of bet... | 08/01/1989 |
| 4781910 | Hydrogen sulfide removal and sulfur recovery The present invention is directed to a process for removing H2 S from a gaseous stream, preferably a natural gas stream, which comprises forming a buffered aqueous H2 S stream containing thiosulfate by contacting the gaseous stream w... | 11/01/1988 |
| 4627964 | Process for the removal of hydrogen sulfide from sour gas A process for the removal of hydrogen sulfide from sour gas or other gases produced upon the retorting of shale by the injection of an aqueous ammonia solution. Further, this process reduces the amount of arsenic present in product oil formed in the retor... | 12/09/1986 |
| 4579727 | Oxidative removal of hydrogen sulfide from gas streams A process for recovering elemental sulfur from a hydrogen sulfide containing gas stream by reacting the hydrogen sulfide in the gas stream with a buffered aqueous solution enriched in thiosulfate ions at an initial pH between about 4.5 and 6.5 for residen... | 04/01/1986 |
| 4508632 | Heat storage materials A heat storage material is described which comprises a mixture of sodium sulfate decahydrate or sodium thiosulfate pentahydrate, and urea. The mixing ratio by mole of the sulfate decahydrate to urea is in the range of 1:1 to 1:3 and the mixing ratio by mo... | 04/02/1985 |
| 4505776 | Composition and method for treating flue gas and methanol containing effluents A composition is provided which comprises an aqueous alkaline solution of a metal salt and black liquor, the metal salt being selected from the group consisting of iron, chromium, cobalt and nickel salts. This composition is useful in a process described ... | 03/19/1985 |
| 4478807 | Method for manufacture of ammonium thiosulfate from ammonia and _solid sulfur or H2 S rich gas stream and/or both solid sulfur _and H2 S gas streams A process for the manufacture of aqueous ammonium thiosulfate from sulfur dioxide wherein ammonium sulfite is formed as an intermediate product by the scrubbing reaction of ammonia with sulfur dioxide in the presence of water. Preferably, the ammonia is a... | 10/23/1984 |
| 4451383 | Recyclable hot pad A liquid melt becomes converted to crystalline form at a particular temperature either spontaneously or when artificially nucleated. The liquid releases heat at crystallization. If the liquid is in a supercooled state when it begins to crystallize, its te... | 05/29/1984 |
| 4451442 | Removal of hydrogen sulfide from fluid streams with minimum production of solids Fluid streams containing hydrogen sulfide from a steam turbine or from a sour gas stream are contacted with an aqueous solution of a polyvalent metal chelate and an oxidizing agent whereby the hydrogen sulfide is converted to free sulfur and then to solub... | 05/29/1984 |
| 4411873 | In-line regeneration of polythionate poisoned ion exchange resins A process is described for minimizing accumulation of undesirable polythionates on an ion exchange resin used to recover uranium values from a leachate from an in situ mining operation by adding sulfite, either as a sulfite salt or as SO2, dire... | 10/25/1983 |
| 4378339 | Ammonium thiosulfate products and methods of making the same An ammonium thiosulfate product and method of making the same are provided in which the product is ammonium thiosulfate crystals with a film of water, i.e. about 80% to 90% ammonium thiosulfate with 10% to 20% water and preferably about 85% ammonium thios... | 03/29/1983 |
| 4369061 | Recovery of precious metals from difficult ores Precious metals such as gold and silver are recovered from difficult-to-treat ores, particularly those containing manganese, by lixiviating using an ammonium thiosulfate leach solution containing copper, sufficient ammonia to maintain a pH of at least 7.0... | 01/18/1983 |
| 4361491 | Supercooled fluids and methods of producing such supercooled fluids This invention relates to a method of producing articles which generate heat at a substantially constant temperature for an extended period of time and which are able to remain in a stable state until such time as the generation of heat is desired. The me... | 11/30/1982 |
| 4355011 | Suppressing decomposition of alkaline solutions of salts of anthraquinonedisulfonic acid In the scrubbing of gases containing sulfur compounds with an aqueous alkaline solution of salts of anthraquinonedisulfonic acid, alkali sulfates are formed during a salt regeneration step, and these sulfates must be kept under a certain upper limit. This... | 10/19/1982 |
| 4299652 | Process for recovery of pulp mill chemicals A process is disclosed in which a waste gas containing sulfur compounds and carbon dioxide from pulp mill is contacted with an aqueous alkali solution derived from green liquor, white liquor or weak white liquor having low pH value and low sodium ion conc... | 11/10/1981 |
| 4210437 | Liquid fertilizer for supply of sulfur, nitrogen and micronutrient metals An aqueous solution of ammonium thiosulfate, ammonia and at least one metal compound selected from the group consisting of the oxides and salts of copper, zinc and manganese provides a source of sulfur, nitrogen and micronutrient metals for fertilizer use... | 07/01/1980 |
| 4199553 | Gas purification process A process for purifying gases containing hydrogen sulfide and/or hydrogen cyanide is provided wherein said gases are contacted with an absorbing solution containing naphthols or their salts as a catalyst having a nitroso group at -position or ... | 04/22/1980 |
| 4156656 | Preparation of hydrosulfides Hydrosulfides of sodium, potassium, calcium, barium and strontium are prepared by reaction of the oxide or hydroxide of the metal with sulfur in aqueous medium at elevated temperature and pressure.... | 05/29/1979 |
| 4133865 | Process for preparing metallic sulphates An improved process for preparing a metallic sulphate in a reaction zone from mixing of the corresponding metallic sulphide concentrates with ammonium sulphate and heating. Heating preferably includes directly contacting the mixture with products of combu... | 01/09/1979 |
| 4122148 | Sulfur dioxide removal process Sodium thiosulfate is purged from a sulfur dioxide removal system involving contact of a sulfur dioxide-containing gas with a solution containing sodium sulfite to absorb sulfur dioxide from the gas. A portion of the liquid from a desorption zone containi... | 10/24/1978 |
| 4105754 | Production of high purity calcium thiosulfate A process for the production of high purity calcium thiosulfate by a metathesis reaction of ammonium thiosulfate and calcium hydroxide or calcium oxide is disclosed. Aqueous solutions of high purity calcium thiosulfate, in concentrations up to about 30% b... | 08/08/1978 |
| 4098639 | Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material A process is provided for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material with alkaline sodium- and sulfur-containing-sulfate pulping liquor, which comprises evaporating and burning spent sulf... | 07/04/1978 |
