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| Number | Title | Issue Date |
| 7438886 | Chemical-biological process for the removal of HS from a gas The present application relates to a process for removing hydrogen sulfide H2S from a gas (1) by contacting said gas with a liquid solution (2) containing ferric sulfate in an absorption column (RC). Ferric sulfate and H2S react a... | 10/21/2008 |
| 7419652 | Process for removing sulfur particles from an aqueous catalyst solution and for removing hydrogen sulfide and recovering sulfur from a gas stream The invention relates to a process for removing hydrogen sulfide and recovering sulfur from a gas stream, comprising the steps of: contacting said gas stream with an aqueous catalyst solution of a polyvalent metal redox catalyst in a contacting zone to absorb said h... | 09/02/2008 |
| 7402547 | Systems and methods of producing a crude product Contact of a crude feed with one or more catalysts produces a total product that includes a crude product. The crude feed has a residue content of at least 0.2 grams of residue per gram of crude feed. Methods of preparing the one or more catalysts are described. The... | 07/22/2008 |
| 7297651 | Process for removing sulfur particles from an aqueous catalyst solution and for removing hydrogen sulfide and recovering sulfur from a gas stream The invention relates to a process for removing sulfur particles from an aqueous catalyst solution used to remove hydrogen sulfide from a gas stream (1, 5), comprising the steps of directing a flow of a suspension (12) comprising reduced catalyst solut... | 11/20/2007 |
| 7279148 | Oxidizer and oxidation process for a desulphurization process An improved oxidizer for liquid reduction-oxidation desulphurization processes uses a hollow fiber membrane contactor. A pressurized, oxygen containing gas stream is introduced into the interior of the hollow fiber membrane while a liquid reduction-oxidation catalys... | 10/09/2007 |
| 7226883 | Oxidizer and oxidation process for a desulphurization process An improved oxidizer for liquid reduction-oxidation desulphurization processes uses a hollow fiber membrane contactor. A pressurized, oxygen containing gas stream is introduced into the interior of the hollow fiber membrane while a liquid reduction-oxidation catalys... | 06/05/2007 |
| 6964755 | Method for producing high activity photocatalyst, photoactivity catalyst, and method for treating hydrogen sulfide for recovering hydrogen gas under low energy by using high activity photocatalyst A high activity catalyst is obtained by oxidizing and modifying the surface of zinc sulfide by hydrogen peroxide. An oxidation treatment is carried out in basic aqueous solution. The high activity photocatalyst is added to the basic aqueous solution in which hydroge... | 11/15/2005 |
| 6669921 | Process for regenerating a catalytic redox solution, to include measuring the oxygen dissolved in the regeneration effluent and its application to desulfurization The present invention relates to a process for regenerating an at least partly reduced catalytic redox solution. The solution includes at least one polyvalent metal chelated by a chelating agent and is circulated in at least one regeneration zone while an... | 12/30/2003 |
| 6596253 | Regeneration of a desulfurizing catalytic solution by means of an ejector In the desulfurization of a gaseous feed containing hydrogen sulfide, comprising contacting the gaseous feed with a catalytic solution containing a chelated polyvalent metal under suitable conditions for oxidation of the hydrogen sulfide to elementary sul... | 07/22/2003 |
| 6589498 | Process and device for treating a gas containing hydrogen sulfide, with recycling of the reduced catalytic solution A process intended for desulfurization of a gaseous feed containing hydrogen sulfide, includes at least the following stages: a) contacting the gaseous feed with a catalytic solution containing at least one polyvalent metal chelated by at least one chelat... | 07/08/2003 |
| 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 |
| 6485697 | Methods for removing sulfur containing compounds and carbon dioxide from gas mixtures Process for the removal of carbon dioxide (CO2) and minor sulfur compounds--mainly hydrogen sulfide (H2 S)--from a sour gas mixture, such as natural gas, iron ore reduction gas, etc. The process uses a continuous absorption process w... | 11/26/2002 |
| 6165436 | High-pressure sulfur recovery process A process is provided for removing hydrogen sulfide out of a gas, such as natural gas. The hydrogen sulfide contaminated gas is contacted with a catalytic aqueous solution containing a polyvalent metal chelating agent under conditions in which the hydroge... | 12/26/2000 |
| 6083472 | Method for continuously producing thiosulfate ions A process is provided for the removal of hydrogen sulfide out of a gas stream by contacting the hydrogen sulfide contaminated gas with a solution of chelated metal catalyst, such as iron EDTA, in a scrubbing vessel so as to result in a cleaned gas and a s... | 07/04/2000 |
| 5958360 | Absorber for liquid redox processes A method and apparatus for contacting a gas and a liquid such as may be utilized in removing sulfur from gas streams, using a liquid redox process, are provided, which prevent or avoid buildup of elemental sulfur in the process equipment by introducing th... | 09/28/1999 |
| 5670123 | Process for the extraction of hydrogen sulphide from a gas mixture A process for the extraction of hydrogen sulphide from a gas mixture comprises: a step (a) in which the gas mixture is passed into an aqueous acidic solution of copper sulphate under conditions which lead to the formation of copper sulphide; a gas which i... | 09/23/1997 |
| 5591419 | Oxidation-reduction process An improved oxidation-reduction process is disclosed that uses catalysts formulated from novel pyridine phosphonate ligands. When these ligands are combined with polyvalent metals the resulting catalyst compositions are useful for the conversion of hydrog... | 01/07/1997 |
| 5569443 | Method for removing hydrogen sulfide from a gas using polyamino disuccinic acid A process for gas conditioning, including a process of removing H2 S from a gas, comprising contacting such gas with an aqueous solution under conditions for removing H2 S, wherein said solution contains at least one higher valence p... | 10/29/1996 |
| 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 |
| 5422086 | Process of removing hydrogen sulfide from a gas mixture The present invention relates to a process for removing hydrogen sulfide from a hydrogen sulfide containing gas comprising contacting the gas in a contactor with an aqueous reactant solution including a coordination complex of Fe(III) with a chelating age... | 06/06/1995 |
| 5417946 | Process for removing total reduced sulfur compounds from gaseous stream A process for removing Total Reduced Sulfur compounds from a gaseous stream such as those containing natural gas, industrial gas, and digester gas by oxidation with a fine flocculent acidic catalyst slurry which is regenerable during the process by pH adj... | 05/23/1995 |
| 5391278 | Process for removal of hydrogen sulfide A process for removal of hydrogen sulfide is here provided by which sulfur and hydrogen can be efficiently recovered from a hydrogen sulfide-containing gas and secondarily produced sulfuric acid can be properly treated, whereby a long-term continuous oper... | 02/21/1995 |
| 5174973 | Method and apparatus for effecting gas-liquid contact Components, usually but not exclusively gaseous components, are removed in a liquid medium from gas streams and chemically converted into an insoluble phase or physically removed. Specifically, hydrogen sulfide may be removed from streams by oxidation in ... | 12/29/1992 |
| 5147620 | Process for the purification of gaseous streams A process for removing hydrogen sulfide from natural gas and other gas streams. By passing a natural gas or other gas stream having a hydrogen sulfide (H2 S) component through an aqueous solution of copper (II) ions (Cu++), the hydro... | 09/15/1992 |
| 5102635 | Method for improving the long-term stability of H2 S absorption-oxidation process solutions The long term stability of process solutions used in H2 S-to-sulfur absorption/oxidation process, wherein the incoming hydrogen sulfide-containing gas stream is contaminated with hydrocarbons and/or organic oxygenated compounds and the process ... | 04/07/1992 |
| 5094824 | H2 S removal process A process for removal of H2 S from sour gaseous streams by use of an aqueous reactant solution is described in which the sour gaseous stream is employed as the motive force to transport the solution during the contact phase of the process, at t... | 03/10/1992 |
| 5023063 | Acid rain abatement The process of this invention will remove from acid rain essentially all of both the sulfur oxides (SOX) and nitrogen oxides (NOX) by catalytically reducing the NOX to water and elemental nitrogen and the SOX to either H2 S or elemental sulfur ... | 06/11/1991 |
| 4968488 | Integrated system for pollution abatement and energy derivation from steam An integrated system for the derivation of useful energy from impure steam and/or use in connection therewith, said steam containing both hydrogen sulfide and an alkaline acting component, such as ammonia, while producing liquid-phase and gaseous-phase ef... | 11/06/1990 |
| 4921682 | Process for removing hydrogen sulphide from gas streams Processes for the removal of hydrogen sulphide from gas streams and for the regeneration of spent scrubbing liquor used in an absorber to remove hydrogen sulphide from a gas stream, are disclosed. In the former process, hydrogen sulphide is removed by fiv... | 05/01/1990 |
| 4889701 | Process for oxidizing multivalent metals A process for oxidizing a metal from a lower valence state to a higher valence state comprises contacting the metal, usually contained in a solution, with a sufficient amount of an oxygen-containing gas to provide at least about 300% excess of stoichiomet... | 12/26/1989 |
| 4876075 | Removal of H2 S from gas streams A process and apparatus for the removal of H2 S from sour gaseous streams is disclosed in which the sour gaseous stream is contacted with an aqueous reactant solution containing solubilized iron chelates. The contacting is carried out in first ... | 10/24/1989 |
| 4853192 | Water removal in a redox process Excess water is removed from regenerated redox solution by contacting a downwardly flowing spray of regenerated redox solution with a stream of inert gas at a rate and pressure sufficient to provide for the substantial saturation of the gas with excess wa... | 08/01/1989 |
| 4830838 | Removal of hydrogen sulfide from fluid streams with minimum production of solids Fluid streams containing hydrogen sulfide from a steam tubine or from a sour gas stream are contacted with an aqueous solution of a polyvalent metal chelate and a bisulfite whereby the hydrogen sulfide is converted to free sulfur and then to soluble sulfu... | 05/16/1989 |
| 4769228 | Method of reducing sulfur deposition in hydrogen sulfide equipment A method is disclosed for reducing the sulfur deposition in the absorber of a Stretford process. In the Stretford process, hydrogen sulfide is removed from a gas stream by contacting the gas stream in an absorber with a circulating aqueous solution to con... | 09/06/1988 |
| 4541998 | Thiocyanate to prevent the formation of thiosulfate in the oxidation of hydrogen sulfide A process is described for preventing the formation of thiosulfate in oxidative hydrogen sulfide scrubbings. For this purpose, an aqueous alkaline scrubbing agent, containing an oxidizing agent, is used, the hydrogen sulfide being absorbed from the scrubb... | 09/17/1985 |
| 4540561 | Removal of H2 S from gaseous streams A process for the removal of hydrogen sulfide from a variety of gas streams is disclosed. The gas stream containing the sour gases is contacted with a reactant solution comprising iron (Fe III) lignosulfonate. The hydrogen sulfide is converted to sulfur, ... | 09/10/1985 |
| 4537752 | Method for removing hydrogen sulfide from gas streams For the simultaneous absorption and oxidation of hydrogen sulfide, gaseous mixtures substantially free of molecular oxygen are scrubbed in a first stage with an aqueous, alkaline scrubbing agent containing pentavalent vanadium as the oxidizing medium. The... | 08/27/1985 |
| 4534955 | Sulfur extraction process An improved solid-liquid separation step for use in connection with the Stretford process introduces a small amount of an additive which is then emulsified and mechanically treated in a colloid mill or processed through an air dissolver before introductio... | 08/13/1985 |
| 4526773 | Scrubbing and oxidation of hydrogen sulfide with removal of dissolved oxygen from scrubbing solution before reuse In a continuous process for the removal of H2 S from a gaseous mixture involving: (a) simultaneous absorption and oxidation of H2 S to form elemental sulfur; (b) regeneration of the oxidizing agent, e.g., vanadate, by treating the us... | 07/02/1985 |
| 4496534 | Method for reconditioning bacteria-contaminated hydrogen sulfide removing systems A method is provided for reconditioning a hydrogen sulfide removal system, such as a Stretford process system in which elemental sulfur is formed, after the system has become contaminated with sulfur-feeding bacteria to an extent that operation thereof is... | 01/29/1985 |
