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| Number | Title | Issue Date |
| 7749481 | System and process for gas sweetening A method for removing hydrogen sulfide from a sour gas stream comprising hydrogen sulfide by oxidizing hydrogen sulfide in a converter by contacting the sour gas stream with an aqueous catalytic solution, thereby producing a desulfurized gas stream and a liquid stre... | 07/06/2010 |
| 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 |
| 7326392 | HS scavenging method A method for removing H2S from H2S-containing gaseous streams in which an H2S-containing gaseous stream is introduced into a flow channel and at least one liquid chemical H2S scavenging agent is also introduced into the fl... | 02/05/2008 |
| 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 |
| 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 |
| 6627108 | Desulphurizing catalytic composition and its use in removing hydrogen sulphide and sulphur dioxide from a gas A desulphurizing composition for the treatment of CLAUS plant tail gases, comprises: an organic solvent A with a boiling point of more than 200° C. at atmospheric pressure; a catalyst composition B of at least one alkali- or alkaline-earth salt (S) ... | 09/30/2003 |
| 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 |
| 6569398 | Method for treating hydrogen sulfide-containing waste gases Disclosed is a method in which hydrogen sulfide-containing liquid sulfur is introduced into a containment vessel to partially fill the containment vessel and create a hydrogen sulfide-containing liquid sulfur phase and a hydrogen sulfide-containing vapor ... | 05/27/2003 |
| 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 |
| 6521201 | Process for recovery of high purity hydrophilic sulfur High quality hydrophilic sulfur is recovered from a biologial conversion zone in which a sulfur containing compound such as a sulfide is converted to elemental sulfur. The sulfur is rendered hydrophilic due to the fine particle size and attachment of biom... | 02/18/2003 |
| 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 |
| 6432375 | Method for removing hydrogen sulfide from gas streams The invention disclosed relates to a process for removing hydrogen sulfide from a gas stream, such as sour natural gas, with the formation of elemental sulfur as a by-product. By controlling the reaction conditions, the conversion of hydrogen sulfide is m... | 08/13/2002 |
| 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 |
| 6096280 | Natural gas treatment process Hydrogen sulfide is removed from gas streams by reaction with sulfur dioxide in an autogeneously-formed aqueous acid medium according to the equation: SO2 +2H2 S.fwdarw.2H2 O+3S the sulfur being removed from the aqueous ph... | 08/01/2000 |
| 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 |
| 5885538 | Method and composition for the regeneration of an aminal compound The present invention provides a method and composition regeneration of an aminal that has previously been reacted with a sulfide selected from hydrogen sulfide and mercaptans. The method includes contacting a scavenging mixture which includes an aminal, ... | 03/23/1999 |
| 5698171 | Regenerative method for removing sulfides from gas streams streams. The method includes contacting the sulfide-containing gas stream with an aqueous scavenging mixture which includes a scavenging compound, that is a product of reaction between an aldehyde and a nitrogen compound, an inorganic ion and an oxidation... | 12/16/1997 |
| 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 |
| 5520818 | Method 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 gas streams by oxidation... | 05/28/1996 |
| 5500130 | Method 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 gas streams by oxidation... | 03/19/1996 |
| 5500135 | Method 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 gas streams by oxidation... | 03/19/1996 |
| 5407646 | Dual impeller method and apparatus for effecting chemical conversion Hydrogen sulfide or other gaseous component is removed from a gas stream containing the same by distribution of the gas stream in the form of fine bubbles by a rotary impeller and stationary shroud arrangement at a submerged location in an aqueous iron or... | 04/18/1995 |
| 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 |
| 5354545 | Process for the removal of sulphur compounds from gases A process for the removal of sulphur compounds from a gaseous effluent, comprising the steps of: a) contacting the gaseous effluent with an aqueous solution wherein sulphur compounds are dissolved; b) adjusting the concentration of buffering compounds suc... | 10/11/1994 |
| 5352421 | 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 gas streams by oxidation... | 10/04/1994 |
| 5334363 | Process for recovering sulfur and hydrogen from hydrogen sulfide A process for converting hydrogen sulfide which is contained in a gaseous feed stream to elemental sulfur and hydrogen. The process comprises contacting said gaseous feed stream with a polar organic solvent having an anthraquinone, and optionally a comple... | 08/02/1994 |
| 5205908 | Purification of process gas from a partial combustion of black liquor The present invention relates to a process for the separation of sulphur and sodium compounds from a hot process gas generated during gasification of spent liquor from the kraft pulping industry, through contact with hydrogen sulphide ion and hydroxide io... | 04/27/1993 |
| 5160714 | Continuous autocirculation, multiple zone mass transfer apparatus and method An apparatus and method of contacting a liquid with different gases sequentially in separate mass transfer zones within a single vessel, the mass transfer zones operatively connected in liquid communication with each other, including intimately contacting... | 11/03/1992 |
| 5139753 | Continuous process for mass transfer of a liquid reagent with two different gases A method and apparatus for removing H2 S from a process gas, including a reaction chamber between an absorption chamber and an oxidizer chamber, in the polyvalent metal redox catalyzed removal of H2 S from a process gas. The process ... | 08/18/1992 |
| 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 |
| 4976935 | Regeneration of solvent in H2 S removal from gases A process of removing hydrogen sulfide from a gas stream in which the hydrogen sulfide is dissolved in an absorption zone by a solvent having a good solvent power for hydrogen sulfide and a much greater solvent power for sulfur dioxide. The resultant solu... | 12/11/1990 |
| 4965062 | Hydrogen sulfide removal and sulfide recovery A process and apparatus for removing hydrogen sulfide from high pressure gas and recovering liquid sulfur, which includes reacting the H2 S with sulfite ions and an acetic acid-acid salt buffering system in an aqueous stream whereby liquid sulf... | 10/23/1990 |
| 4892723 | 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 ... | 01/09/1990 |
| 4861576 | Method for reducing corrosion in a bypass system A method and apparatus for reducing leakage of process fluid through an ordinarily closed bypass conduit is disclosed which comprises a bypass conduit connected in parallel with a fluid processing unit so that a blocked-in portion of the bypass conduit ma... | 08/29/1989 |
| 4765969 | Continuous process for scrubbing hydrogen sulfide to produce elemental sulfur A continuous process for removing hydrogen sulfide from a gas stream by contacting the gas stream with a solution of ammonium hydroxide to produce an effluent liquid stream comprising ammonium sulfide which is fed to a heating zone maintained at least at ... | 08/23/1988 |
