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| Number | Title | Issue Date |
| 8178070 | Air demand feedback control systems and methods for sulfur recovery units A Claus plant with multiple parallel thermal stages that provide a combined effluent to downstream catalytic stages includes a controller that allows independent and individual control for each of the thermal stages as a function of measured chemical composition of ... | 05/15/2012 |
| 8071068 | Process for desulphurization of a gaseous effluent comprising a device for on-line analysis and control The invention concerns a process for desulphurization of a gaseous effluent containing hydrogen sulphide using a Claus treatment unit followed by a Claus tail gas treatment unit (TGT), said process comprising using a device for on-line analysis of the ratio H2 | 12/06/2011 |
| 7867459 | Compact, tiered sulfur recovery unit A compact, tiered sulfur recovery unit having a burner, a combustion chamber, a reaction chamber, a waste heat boiler and a steam drum. The waste heat boiler is mounted above the reaction chamber, and the steam drum is mounted above the waste heat boiler, resulting ... | 01/11/2011 |
| 7780942 | Method of optimizing the operation of claus units A catalytic method for treating an H2S/SO2 mixture for producing liquid sulphur including the following steps: a) at least one step of heating the mixture containing H2S/SO2 to a temperature Tc; b) at least one step of cat... | 08/24/2010 |
| 7648692 | COS-Claus configurations and methods Carbonyl sulfide (COS) from a COS-containing stream (106) is convened in a Claus plant (100) to elemental sulfur (152, 162) by oxidation of a first portion of the COS-containing stream to SO2 and by hydrolysis of a second portion of t... | 01/19/2010 |
| 7597872 | Process for treating a gas containing hydrogen sulphide and sulphur dioxide A process for treating a gas containing hydrogen sulphide (H2S) and sulphur dioxide, contacting the gas at a suitable temperature with an organic solvent containing at least a soluble catalytic system, comprising at leas... | 10/06/2009 |
| 7550132 | Process for the production of sulfur, starting from the hydrogen sulphide contained in the natural gas, or in the associated gas and possible disposal of the thus obtained sulfur Process for the production of sulfur, obtained in pure form, and possibly easily disposable even at ambient temperature, starting from hydrogen sulphide contained in natural gas, which includes: a) oxidizing a portion of hydrogen sulphide to sulfur dioxide; b) disso... | 06/23/2009 |
| 7514064 | Free-flowing sulfur transport, storage and use to produce energy, fertilizer or hydrogen without carbon dioxide Elemental sulfur is combined with either liquid anhydrous ammonia, liquid sulfur dioxide, or both to form a solution or slurry which is transportable through pipelines or other transport vessels without a risk of clogging due to the environmental temperature drops t... | 04/07/2009 |
| 7381393 | Process for sulfur removal suitable for treating high-pressure gas streams H2S-containing gases, particularly such gases at elevated pressure, are treated to remove H2S by reaction in a liquid medium with SO2, the SO2 being present in stoichiometric excess with respect to the H2S. The ... | 06/03/2008 |
| 7374742 | Direct sulfur recovery system The present invention provides a method for removing sulfur species from a gas stream without the use of a sulfur species removal process, such as an amine scrub. The sulfur species are removed by directly subjecting the gas stream to a sulfur recovery process, such... | 05/20/2008 |
| 7357908 | Apparatus and catalytic partial oxidation process for recovering sulfur from an HS-containing gas stream The disclosed sulfur recovery system and process avoid some of the operational problems of conventional Claus plants and processes by replacing the reaction burner and furnace tube of a conventional Claus plant with a more efficient short contact time catalytic reac... | 04/15/2008 |
| 7351392 | Process for the high recovery efficiency of sulfur from an acid gas stream A combined process for the recovery of sulfur from an acid gas stream. The combined process includes both a Claus unit and a unit for treating the Claus tail gas with caustic to remove hydrogen sulfide therefrom and to biologically oxidize the hydrogen sulfide using... | 04/01/2008 |
| 7332145 | Process and installation for the treatment of DSO Disclosed is a process for the treatment of gas containing mercaptans and acid gases, including the following steps: (1) separating the acid gases from the said gas and obtaining a sweetened gas and the flow of acid gases containing H2S; (2) reacting the ... | 02/19/2008 |
| 7311891 | Process for the recovery of sulfur from Claus tail gas streams Recovering sulfur from a gas stream containing hydrogen sulfide by oxidizing the gas stream to convert the hydrogen sulfide in the gas stream to sulfur oxide, and thus form a sulfur oxide enriched gas stream. The sulfur oxide enriched gas stream is contacted with a ... | 12/25/2007 |
| 7291320 | Process for the selective oxidation of hydrogen sulfhide A process for the selective oxidation of hydrogen sulphide in a hydrogen sulphide containing feed gas to elemental sulphur, wherein the hydrogen sulphide containing feed gas (3), an inert liquid medium (5), and a molecular-oxygen containing gas (4 | 11/06/2007 |
| 7282193 | Method for energy recovery from hydrogen sulfide A method for producing sulfur and energy from an acid gas stream containing hydrogen sulfide by partially combusting the acid gas stream to produce a combustion product gas, mixing a sulfur dioxide stream with the combustion product gas, separating sulfur from the m... | 10/16/2007 |
| 7259580 | Method and apparatus for temporary thermal coupling of an electronic device to a heat sink during test A method, system and apparatus for testing an electronic device. The method including: (a) forming a temporary liquid heat transfer layer on a surface of the electronic device; after step (a), (b) placing a surface of a heat sink into physical contact with a surface... | 08/21/2007 |
| 7250149 | Sulfur gas treatment process The present invention comprises a method of treating an off-gas stream from a refining process to remove sulfur compounds. A portion of the off-gas stream containing hydrogen sulfide is injected at the front end of the thermal reactor and in at least one other locat... | 07/31/2007 |
| 7226572 | Compact sulfur recovery plant and process A compact sulfur recovery system is disclosed which comprises a primary structure including a catalytic partial oxidation reaction zone, a first temperature-control zone, a first Claus catalytic reaction zone, a second temperature-control zone, a first liquid sulfur... | 06/05/2007 |
| 7189381 | Method of scrubbing lower mass sulfides with a sulfide scrubbing medium capable of regeneration A method of scrubbing lower mass sulfides with a sulfide scrubbing medium capable of regeneration. The sequential order of gas flow through three vessels is altered. A first of the three vessels is maintained in a scrubbing mode, scrubbing to breakthrough sulphur fr... | 03/13/2007 |
| 7157070 | Method for purifying gas containing hydrocarbons A hydrocarbon gas containing H2S, mercaptans and CO2 is fed to an absorption plant operated at a pressure of 20 to 80 bar and supplied with a selective solvent, a solvent stream loaded with H2S and a roughly desulfurized gas stream a... | 01/02/2007 |
| 7067101 | Water wall boiler for air and oxygen fired Claus sulfur recovery units The thermal combustion step of the modified Claus process is carried out in a water-wall boiler instead of a refractory-lined reaction furnace. The water-wall boiler replaces the conventional refractory-lined furnace and waste heat boiler when air, oxygen, or oxygen... | 06/27/2006 |
| 7060233 | Process for the simultaneous removal of sulfur and mercury A process for removing hydrogen sulfide, other sulfur-containing compounds and/or sulfur and mercury from a gas stream contaminated with mercury, hydrogen sulfide or both. The method comprises the step of selective oxidation of hydrogen sulfide (H2S) in a... | 06/13/2006 |
| 7055395 | Sulfur deposition control method and related control algorithm A method for detecting and controlling the elemental sulfur deposition on pressure reducing gas fuel control valves in cases where the sulfur deposition results from a temperature drop during expansion across the control valve, such as that encountered in gas turbin... | 06/06/2006 |
| 7036461 | Waste-heat boiler for a Clause plant The invention relates to a waste-heat boiler (3) for a Claus plant, comprising a steam generation chamber that is surrounded by a pressure-proof jacket (14), a long tube bundle (18) of heat exchanger tubes that extend through the steam generatio... | 05/02/2006 |
| 7033565 | Production of sulphuric acid from a feed gas with varying concentration of sulphur dioxide A process for the production of sulphuric acid from a sulphur dioxide containing feed gas with concentration of SO2 fluctuating between 0 and 100 mole % SO2 comprising the steps of contacting the feed gas with an aqueous solution comprising 0â€... | 04/25/2006 |
| 7005115 | Gas combustion treatment method and apparatus therefor A gas combustion treatment method for the combustion treatment of an ammonia-containing gas and a hydrogen sulfide-containing gas, the method comprising a first combustion treatment step in which the ammonia-containing gas, together with a fuel, is introduced and bu... | 02/28/2006 |
| 6976689 | Linked suspension system for a vehicle A suspension system for a vehicle, having at least first and second shock absorbers. The first shock absorber has a first main piston, and the second shock absorber has a second main piston. The shock absorbers are motively linked such that when the first main pisto... | 12/20/2005 |
| 6964729 | Oxidizing undesired compounds resident within liquid absorbent compounds, reducing atmospheric pollution, regenerating a liquid absorbent and conserving fuel usage associated with reboiler utilization An improved method and apparatus for oxidizing undesired compounds residing within a liquid glycol based absorbent wherein the compounds are heated within a reboiler chamber to their boiling point to effectuate production of vaporized effluents. The absorbent's vapo... | 11/15/2005 |
| 6962683 | Method of removing and recovering elemental sulfur from highly reducing gas streams containing sulfur gases A method is provided for removal of sulfur gases and recovery of elemental sulfur from sulfur gas containing supply streams, such as syngas or coal gas, by contacting the supply stream with a catalyst, that is either an activated carbon or an oxide based catalyst, a... | 11/08/2005 |
| 6962680 | Method and apparatus for removing sulfur compound in gas containing hydrogen sulfide, mercaptans, carbon dioxide and aromatic hydrocarbon A method for removing sulfur compounds including transferring the impurity gas to a concentration process in which the impurity gas is separated into a concentrated gas containing hydrogen sulfide and a residual gas containing carbon dioxide, mercaptans and aromatic... | 11/08/2005 |
| 6960332 | Process for purifying aqueous buffer solutions The present invention describes a procedure for the removal of sodium sulphate from a phosphate solution that has been used for absorption of SO2 from flue gases, in which a precipitate forms when the absorption solution is regenerated by evaporation. In ... | 11/01/2005 |
| 6960548 | Method for regenerating used absorbents derived from treatment of thermal generator fumes Process and device for regeneration of a used absorbent from a desulfurization zone or from the desulfurization of a gas containing sulfur oxides, comprising regeneration simultaneously with filtering of the absorbent, in a reducing atmosphere, wherein partial combu... | 11/01/2005 |
| 6919059 | Process and apparatus for recovering sulphur from a gas stream containing sulphide Oxygen or oxygen-enriched air is employed to support combustion in furnaces (16) and (26) of part of the hydrogen sulphide content of a first feed gas stream. Sulphur vapour is extracted in condenser (32) from the resulting gas mixture so as to ... | 07/19/2005 |
| 6902713 | Method for partially oxidizing a gas stream comprising hydrogen sulphide and ammonia A method for partially oxidizing, in a Claus furnace, at least one gas containing hydrogen sulfide and ammonia with at least one gas rich in oxygen. The residual ammonia content at the outlet of the furnace is measured with a laser diode. Based upon this measurement... | 06/07/2005 |
| 6893620 | Process and apparatus for recovering sulphur from a gas stream containing hydrogen sulphide Oxygen or oxygen-enriched air is employed to support combustion in furnace (16) of part of the hydrogen sulphide content of a first feed gas stream. Sulphur is extracted from the resulting gas stream in a sulphur condenser (26). Catalyst Claus reaction... | 05/17/2005 |
| 6892473 | Process for removing water from ammonia This invention relates to an improvement in a process for removing water from a hydride gas, and particularly ammonia, by contacting the hydride gas with a drying agent under conditions for effecting removal of the water. The improvement for significantly reducing t... | 05/17/2005 |
| 6890498 | Burner and method for partly oxidising a gas stream comprising hydrogen sulphide and ammonia A gas burner for use with a Claus furnace made up of at least five concentric tubes and the spaces formed between them. The diameters of the tubes increase radially outward so that the first tube has a smaller diameter than the fifth tube. At the end of the burner c... | 05/10/2005 |
| 6800261 | Process for the removal of sulphur compounds from gases The invention is directed to a process for the catalytic reduction of sulphur dioxide from a gas mixture at least containing 10 vol. % of water, in which process the gas mixture is passed over a sulphur resistant hydrogenation catalyst in sulphidic form, at a space ... | 10/05/2004 |
| 6780392 | Method and device for converting hydrogen sulfide into elemental sulfur In a process for producing elemental sulfur by combustion of hydrogen sulfide or a hydrogen-sulfide-containing gas, in particular a Claus process, the hydrogen sulfide or the hydrogen-sulfide-containing gas undergoes partial combustion by using a first device in the... | 08/24/2004 |
