Sulfuric Acid Patents (Class 423/522)
  • Patent number: 10858251
    Abstract: A process for preparing sulfuric acid may involve oxidizing sulfur to sulfur dioxide by way of dried air in a first oxidation stage. The sulfur dioxide may then be oxidized to sulfur trioxide in a second oxidation stage. The sulfur trioxide may be absorbed by sulfuric acid in at least one absorption stage. Further, heated sulfuric acid may be drawn off from the absorption stage and used for generating steam. Process gas from an intermediate absorption stage may be recycled to the second oxidation stage and, in some cases, a final absorption stage after the process gas flows through the second oxidation stage.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: December 8, 2020
    Assignees: THYSSENKRUPP INDUSTRIAL SOLUTIONS AG, THYSSENKRUPP AG
    Inventors: Holger Thielert, Zion Guetta
  • Patent number: 10829376
    Abstract: A process plant for production of sulfuric acid from a process gas comprising SO2, including a process gas inlet, a first SO2 converter having an inlet and an outlet, a first condenser having a gas inlet, a gas outlet and a liquid outlet, a gas mixing device having a first inlet, a second inlet and an outlet, a process gas heater having an inlet and an outlet, a second SO2 converter having an inlet and an outlet, a second condenser having a gas inlet, a gas outlet and a liquid outlet, one or more means for cooling and storage of sulfuric acid and a purified process gas outlet.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: November 10, 2020
    Assignee: HALDOR TOPSØE A/S
    Inventors: Mads Lykke, Rasmus Sverdrup, Morten Thellefsen
  • Patent number: 10647577
    Abstract: In a production mode a process for preparing sulfuric acid may involve oxidizing sulfur to sulfur dioxide in a first oxidation stage, and catalytically oxidizing the sulfur dioxide to sulfur trioxide in a second oxidation stage. The sulfur trioxide may be absorbed in at least one absorption stage. In the production mode, process gases from a last of the at least one absorption stage with respect to a flow direction are discharged. In a standby mode of the process, at least one heating stage for heating the process gases is connected. The process gases exiting from the at least one absorption stage are conveyed to the heating stage, and the process gases are circulated via the heating stage, the second oxidation stage, and the absorption stage.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: May 12, 2020
    Assignees: THYSSENKRUPP INDUSTRIAL SOLUTIONS AG, THYSSENKRUPP AG
    Inventors: Holger Thielert, Zion Guetta
  • Patent number: 10633251
    Abstract: The invention is a method and a sulfuric acid plant design for reduction of start-up SO2, SO3 and H2SO4 emissions in sulfuric acid production, in which SO2 is converted to SO3 in n successive catalyst beds, where n is an integer >1. The final catalytic beds are used as absorbents for SO2 to SO3 during the start-up procedure, and one or more of the m beds downstream the first bed are purged, either separately or simultaneously, with hot gas, where m is an integer >1 and m<n, during the previous shut-down. Also, one separate purge with hot gas is used on the final bed.
    Type: Grant
    Filed: October 24, 2016
    Date of Patent: April 28, 2020
    Assignee: HALDOR TOPSØE A/S
    Inventors: Mårten Nils Rickard Granroth, Per Aggerholm Sørensen, Kurt Agerbæk Christensen
  • Patent number: 10532930
    Abstract: A plant for the production of sulfur trioxide from a feed stream containing sulfur-containing compounds and dissolved metals and alkali metals by a process, which involves gas quenching, comprises an incineration furnace, a mixing device and/or a dilution air heater, a dust removal device and an SO2 converter. The plant may further comprise a condenser for the purpose of producing sulfuric acid.
    Type: Grant
    Filed: July 4, 2017
    Date of Patent: January 14, 2020
    Assignee: Haldor Topsoe A/S
    Inventors: Morten Thellefsen, Martin Møllerhøj
  • Patent number: 10294105
    Abstract: The above mentioned invention describes a process for cooling a gas mixture of SO2 and/or SO3 and water, wherein the gas mixture is cooled by means of a first heat exchanger carrying a coolant. The temperature of the coolant lies above the dew point of the gas or gas mixture.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: May 21, 2019
    Assignee: OUTOTEC (FINLAND) OY
    Inventors: Karl-Heinz Daum, Hannes Storch, Ralf Neumann, Wolfram Schalk
  • Patent number: 9938225
    Abstract: The invention relates to methyl methacrylate characterized in that at least one portion of the carbons thereof is biologically sourced and, more specifically, in that it contains between 0.2×10?10 and 1.2×10?10 wt.-% of 14C in relation to total carbon weight according to the ASTM D6866 standard. The preparation method uses acetone cyanohydrin as a raw material, the acetone cyanohydrin being obtained by condensing cyanohydric acid on acetone, and the methyl methacrylate is prepared using a process involving the addition of methanol. According to the invention, at least one from among the acetone, cyanohydric acid and methanol is obtained by a reaction or series of reactions involving the biomass.
    Type: Grant
    Filed: February 7, 2014
    Date of Patent: April 10, 2018
    Assignee: ARKEMA FRANCE
    Inventors: Jean-Luc Dubois, Jean Francois Croizy
  • Patent number: 9499405
    Abstract: This disclosure relates to a process for producing sulfuric acid with reduced levels of niter. The process involves (a) providing an absorption tower wherein sulfur trioxide is absorbed in a sulfuric acid feed having a first sulfuric acid solution to produce a sulfuric acid effluent having (i) a second sulfuric acid solution which has a higher concentration than the first sulfuric acid solution, (ii) a niter concentration greater than about 5 ppm (as NO3), and (iii) a temperature greater than 100° C.; and (b) contacting a first purifying agent comprising sulfamic acid and a second purifying agent comprising hydrogen peroxide with the sulfuric acid effluent to form a treated sulfuric acid effluent, the treated sulfuric acid effluent being maintained at a temperature of greater than 100° C. for a maintenance period of at least about 1 minute.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: November 22, 2016
    Assignee: EI DU PONT DE NEMOURS AND COMPANY
    Inventor: Hasan Dindi
  • Patent number: 9487401
    Abstract: The present invention relates to a process plant for the oxidation of SO2 to SO3 in a process gas, said process plant comprising a heat exchanger configured for heating the process gas by heat exchange with an oxidized process gas and/or a further oxidized process gas by providing thermal contact between said process gas and said oxidized process gas and/or said further oxidized process gas, a first zone of material catalytically active in oxidation of SO2 to SO3, and a boiler configured for containing steam being heated by the oxidized process gas and/or the further oxidized process after said oxidized process gas has been cooled in the heat exchanger characterized in the cooled oxidized process gas in the boiler being non-condensing with the benefit of providing the possibility for a smaller heat exchanger which may be made with only moderate corrosion resistant materials, compared to a process plant according to the prior art, as well as a related process.
    Type: Grant
    Filed: June 3, 2013
    Date of Patent: November 8, 2016
    Assignee: Haldor Topsoe A/S
    Inventor: Martin Møllerhøj
  • Patent number: 9297301
    Abstract: A remedial pollution control system for treating volatile organic compounds that may include a vapor concentrator connected to a line that is laden with volatile organic compounds, the concentrator has an organic condensate output line and a vapor output line; a mixing chamber adapted to receive air provided from an air supply line, combustible fuel from an alternate fuel supply line, and a vapor stream from the vapor output line to produce a mixed fuel supplied to an internal combustion engine, a control mixing system with a controller for producing a proper air to fuel ratio in the mixed fuel supply, and power generated to operate other devices used to more efficiently abate volatile organic compounds and reduce greenhouse gas emissions.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: March 29, 2016
    Assignee: INNOVATIVE ENVIRONMENTAL SOLUTIONS, LLC
    Inventors: Michael J. Joy, Lawrence Neill
  • Patent number: 9162890
    Abstract: A contact process for manufacture of sulfuric acid in which the vapor phase heat of formation of sulfuric acid in the sulfur trioxide conversion gas and the heat of absorption of SO3 in sulfuric acid is recovered by transfer of heat from the absorption acid to high pressure boiler feed water that is fed to a waste heat boiler where steam is generated at a pressure of at least 40 bar by transfer of heat from sulfur dioxide combustion gas.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: October 20, 2015
    Assignee: MECS, Inc.
    Inventor: Ernesto Vera-Castañeda
  • Patent number: 9108846
    Abstract: Provided is a method for preparing sulfuric acid by using hydrogen sulfide. The method comprises the following steps: (1) performing a reduction-oxidation reaction between an H2S feed gas and oxygen to prepare SO2; (2) cooling the product acquired in step (1) to a temperature between 390° C. and 430° C., then performing a catalyzed oxidation reaction with oxygen; and (3) cooling the product acquired in step (2), then further cooling to a temperature between 60° C. and 120° C., collecting H2SO4 product. Also provided is a heat exchanger, comprising a housing and several glass pipes arranged within the housing along the direction of a long axis of the housing, arching between two lateral walls thereof; the adjacent glass pipes are connected head-to-tail. The method provides great hydrogen sulfide removal efficiency, simple process flow, and allows for economic efficiency of apparatus and reasonable utilization of energy.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: August 18, 2015
    Assignee: Shanghai Keyontechs Co., Ltd.
    Inventors: Ren Zhou, Rui Huang
  • Publication number: 20150147266
    Abstract: The present invention relates to a process plant for the oxidation of SO2 to SO3 in a process gas, said process plant comprising a heat exchanger configured for heating the process gas by heat exchange with an oxidized process gas and/or a further oxidized process gas by providing thermal contact between said process gas and said oxidized process gas and/or said further oxidized process gas, a first zone of material catalytically active in oxidation of SO2 to SO3, and a boiler configured for containing steam being heated by the oxidized process gas and/or the further oxidized process after said oxidized process gas has been cooled in the heat exchanger characterized in the cooled oxidized process gas in the boiler being non-condensing with the benefit of providing the possibility for a smaller heat exchanger which may be made with only moderate corrosion resistant materials, compared to a process plant according to the prior art, as well as a related process.
    Type: Application
    Filed: June 3, 2013
    Publication date: May 28, 2015
    Applicant: Haldor Topsøe A/S
    Inventor: Martin Møllerhøj
  • Patent number: 8951494
    Abstract: A process for the conversion of sulphur dioxide contained in a feed gas to sulphur trioxide, comprising the steps of a) alternatingly providing a first feed gas containing a high concentration of sulphur dioxide and a second feed gas containing a low concentration of sulphur dioxide as a process gas, b) preheating the process gas by heat exchange with a heat exchange medium, c) reacting the process gas in the presence of a catalytically active material in a catalytic reaction zone, d) converting at least in part the sulphur dioxide of the process gas into sulphur trioxide contained in a product gas in the catalytic reaction zone, e) cooling the product gas by contact with a heat exchange medium, wherein a thermal buffer zone is provided in relation to one of said process steps, providing thermal energy produced during super-autothermal operation for heating the process gas during sub-autothermal operation.
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: February 10, 2015
    Assignee: Haldor Topsoe A/S
    Inventors: Martin Møllerhøj, Mads Lykke, Morten Thellefsen, Peter Schoubye
  • Patent number: 8926936
    Abstract: The invention relates to a condenser, having a process gas side and a heat transfer medium side said condenser being configured for feeding a hot process gas containing a condensable component to an inlet of the condensing side, and being further configured for withdrawing a cooled process gas from an outlet of the condensing side, and being even further configured for withdrawing a condensate in a position proximate to one end of the condenser, and said condenser having the process gas side divided in a process gas cooling zone configured for having a cool heat transfer medium inlet and a heated heat transfer medium outlet, and a process gas re-heating zone downstream the process gas cooling section, configured for re-heating of the process gas, as well as a processes for condensation and production of sulphuric acid employing such a condenser.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: January 6, 2015
    Assignee: Haldor Topsoe A/S
    Inventors: Anders Helbo Hansen, Anders Juul Rasmussen, Mads Lykke
  • Patent number: 8916127
    Abstract: A method for making sulfuric acid comprises: providing solid sulfur, melting the solid sulfur into liquid sulfur in a sulfur melting tank, burning the sulfur to generate a sulfur product, recycling high order heat energy generated from burning the sulfur and providing the high order heat energy to a distillation tower, recycling low order heat energy generated from burning the sulfur and providing the low order heat energy to the sulfur melting tank, providing hydrogen peroxide or sulfuric acid containing hydrogen peroxide into an absorption-reaction tower for reacting to produce a sulfuric acid product, and concentrating or purifying the sulfuric acid product to improve its concentration or purity.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: December 23, 2014
    Assignee: Green America Enterprises Ltd.
    Inventors: Hsien-Ping Chiu, Chun-Ching Kao
  • Patent number: 8906133
    Abstract: A process for cooling an acid that is withdrawn from an absorption apparatus of a sulfuric acid plant includes pumping the acid to be cooled from an acid pump tank and supplying the acid to a shell space of a heat exchanger. Water is supplied as a heat transport medium to heat transfer elements disposed in the shell space so as to at least partially convert, by heat transfer from the acid, the water to steam. The acid which was cooled in the heat exchanger is supplied back to the absorption apparatus. The water is separated from the steam in a steam drum. The separated water is recirculated to the heat exchanger using a pump.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: December 9, 2014
    Assignee: Outotec Oyj
    Inventors: Karl-Heinz Daum, Wolfram Schalk
  • Patent number: 8894965
    Abstract: This invention relates to the recovery of energy in the manufacture of sulfuric acid, and more particularly to enhanced recovery of energy from the absorption of wet SO3 in sulfuric acid. The invention is further directed to control of mist formation during SO3 absorption, and of the sulfuric acid mist content of the gas stream leaving the SO3 absorption step in a process wherein SO3 absorption energy is recovered from absorption acid in useful form.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: November 25, 2014
    Assignee: MECS Inc
    Inventor: Ernesto Vera-Castaneda
  • Publication number: 20140322125
    Abstract: A contact process for manufacture of sulfuric acid is disclosed in which the vapor phase heat of formation of sulfuric acid in the sulfur trioxide conversion gas and the heat of absorption of SO3 in sulfuric acid is recovered by transfer of heat from the absorption acid to high pressure boiler feed water that is fed to a waste heat boiler where steam is generated by transfer of heat from sulfur dioxide combustion gas. Heat is transferred from the absorption acid to a boiler feed water stream in an array of heat exchangers that are in series with respect to the flow of both the boiler feed water stream and the absorption acid stream, and with respect to which array the absorption acid stream and the boiler feed water stream flow countercurrently. Boiler feed water is allowed to flash in a reduced pressure zone in the boiler feed water path, thus preserving a ?t throughout the array of heat exchangers for recovering heat from the absorption acid in water fed to the high pressure boiler.
    Type: Application
    Filed: March 17, 2014
    Publication date: October 30, 2014
    Applicant: MECS, Inc.
    Inventor: Ernesto Vera-Castañeda
  • Patent number: 8815202
    Abstract: A process for producing sulfuric acid with reduced levels of nitrogen oxides (NOx) within a typical sulfuric acid production line. A hydrazine source material can be mixed with a sulfuric acid effluent at a temperature of at least about 90° C. for a period of at least 1 minute to reduce the level of NOx is the sulfuric acid effluent.
    Type: Grant
    Filed: August 19, 2013
    Date of Patent: August 26, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Hasan Dindi, Donald James Loftus
  • Publication number: 20140219910
    Abstract: The invention relates to a process for oxidation of SO2 to SO3 comprising the steps of (a) directing a stream of feed gas comprising SO2 and O2 to a catalytically active material, (b) oxidizing an amount of said SO2 in said process gas to SO3 in the presence of the catalytically active material, providing a first oxidized process gas, (c) reacting SO3 with water, (d) condensing H2SO4, (e) withdrawing a first desulphurized process gas and a first stream of sulphuric acid, (f) from the desulphurized process gas withdrawing a recycle stream of desulphurized process gas, wherein the recycle stream is added to said stream of feed gas or said first oxidized process gas with the associated benefit of reducing the molar flow of process gas downstream withdrawal of the recycle stream and upstream the mixing point.
    Type: Application
    Filed: September 27, 2012
    Publication date: August 7, 2014
    Inventor: Mads Lykke
  • Publication number: 20140205534
    Abstract: Provided is a method for preparing sulfuric acid by using hydrogen sulfide. The method comprises the following steps: (1) performing a reduction-oxidation reaction between an H2S feed gas and oxygen comprised in an oxygen-rich air to prepare SO2, controlling residual oxygen after the reduction-oxidation reaction step at a molar percentage of ?2%; (2) cooling the product acquired in step (1) to a temperature between 390° C. and 430° C., and then performing a catalyzed oxidation reaction with oxygen, wherein the catalyzed oxidation reaction is performed in stages until the conversion rate of SO2 is ?98.7% or the outlet concentration of SO2 is ?550 mg/Nm3; and (3) cooling the product acquired in step (2) to a temperature ?10° C. over the dew point temperature of H2SO4, then further cooling to a temperature between 60° C. and 120° C., collecting H2SO4 product, and subjecting the gas acquired after cooling to a coalescent separation before discharging directly into the atmosphere.
    Type: Application
    Filed: June 29, 2012
    Publication date: July 24, 2014
    Applicant: SHANGHAI KEYONTECHS CO., LTD.
    Inventors: Ren Zhou, Rui Huang
  • Patent number: 8758718
    Abstract: Improved catalysts for oxidation of sulfur dioxide which are alkali metal-promoted vanadium catalysts which are further promoted by gold. Improved methods employing such catalyst for oxidation of sulfur dioxide and for manufacture of sulfuric acid. Improved methods for multiple step oxidation of sulfur dioxide in which the last oxidation step is carried out employing improved catalysts of this invention at temperatures lower than 400° C.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: June 24, 2014
    Assignee: TDA Research, Inc.
    Inventors: Girish Srinivas, Steven C. Gebhard
  • Publication number: 20140079624
    Abstract: This invention relates to the recovery of energy in the manufacture of sulfuric acid, and more particularly to enhanced recovery of energy from the absorption of wet SO3 in sulfuric acid. The invention is further directed to control of mist formation during SO3 absorption, and of the sulfuric acid mist content of the gas stream leaving the SO3 absorption step in a process wherein SO3 absorption energy is recovered from absorption acid in useful form.
    Type: Application
    Filed: November 15, 2013
    Publication date: March 20, 2014
    Applicant: MECS INC
    Inventor: ERNESTO VERA-CASTANEDA
  • Publication number: 20140056802
    Abstract: A process for producing sulfuric acid with reduced levels of nitrogen oxides (NOx) within a typical sulfuric acid production line. A hydrazine source material can be mixed with a sulfuric acid effluent at a temperature of at least about 90° C. for a period of at least 1 minute to reduce the level of NOx is the sulfuric acid effluent.
    Type: Application
    Filed: August 19, 2013
    Publication date: February 27, 2014
    Applicant: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: Hasan Dindi, Donald James Loftus
  • Patent number: 8658121
    Abstract: A method for adjusting a concentration of an acid or lye includes charging a medium for adjusting the concentration of the acid or lye into a supply conduit of the acid or lye so as to provide a combined stream. The combined stream is supplied through an inlet to a mixing chamber such that the combined stream is deflected upon entering the mixing chamber. The combined stream is mixed in the mixing chamber. The combined stream is discharged through an outlet of the mixing chamber such that the combined stream is again deflected upon being discharged from the mixing chamber.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: February 25, 2014
    Assignee: Outotec Oyj
    Inventors: Karl-Heinz Daum, Henry Eisermann, Wolfram Schalk
  • Publication number: 20140048228
    Abstract: The invention relates to a condenser, having a process gas side and a heat transfer medium side said condenser being configured for feeding a hot process gas containing a condensable component to an inlet of the condensing side, and being further configured for withdrawing a cooled process gas from an outlet of the condensing side, and being even further configured for with-drawing a condensate in a position proximate to one end of the condenser, and said condenser having the process gas side divided in a process gas cooling zone configured for having a cool heat transfer medium inlet and a heated heat transfer medium outlet, and a process gas re-heating zone downstream the process gas cooling section, configured for re-heating of the process gas, as well as a processes for condensation and production of sulphuric acid employing such a condenser.
    Type: Application
    Filed: March 16, 2012
    Publication date: February 20, 2014
    Inventors: Anders Helbo Hansen, Anders Juul Rasmussen, Mads Lykke
  • Patent number: 8623319
    Abstract: Provided is a process for directly producing sulfur trioxide and sulfuric acid from gypsum. Sulfur trioxide is directly substituted with silicon dioxide by thermal or light-quantum activation, which is assisted with catalytic activation, while restraining reducing atmosphere and removing the resultant sulfur trioxide in time. The resultant sulfur trioxide is then used as raw material to produce sulfuric acid by a well-known method in prior art. The process has the advantages of simplified operational steps, little investment, low energy consumption and manufacturing cost, and low environmental pollution.
    Type: Grant
    Filed: July 5, 2010
    Date of Patent: January 7, 2014
    Inventor: Xiaolin Yin
  • Publication number: 20130336876
    Abstract: Improved catalysts for oxidation of sulfur dioxide which are alkali metal-promoted vanadium catalysts which are further promoted by gold. Improved methods employing such catalyst for oxidation of sulfur dioxide and for manufacture of sulfuric acid. Improved methods for multiple step oxidation of sulfur dioxide in which the last oxidation step is carried out employing improved catalysts of this invention at temperatures lower than 400° C.
    Type: Application
    Filed: October 29, 2010
    Publication date: December 19, 2013
    Inventors: Girish Srinivas, Steven C. Gebhard
  • Patent number: 8597603
    Abstract: The present invention provides a new method for decomposing and/or removing hazardous substances using a photocatalytic material. The method of the present invention is sufficiently useful in fields requiring quick decomposition and/or removal of hazardous substances in gas and/or liquid phases. The decomposition method of the present invention using a photocatalytic material enables significantly efficient and rapid decomposition of hazardous substances in gas and/or liquid phases by causing a photocatalytic material to coexist with a dilute hydrogen peroxide solution.
    Type: Grant
    Filed: May 30, 2011
    Date of Patent: December 3, 2013
    Assignee: Showa Co., Ltd.
    Inventors: Teruki Takayasu, Teruo Arai, Kinji Onoda
  • Patent number: 8586001
    Abstract: This invention relates to the recovery of energy in the manufacture of sulfuric acid, and more particularly to enhanced recovery of energy from the absorption of wet SO3 in sulfuric acid. The invention is further directed to control of mist formation during SO3 absorption, and of the sulfuric acid mist content of the gas stream leaving the SO3 absorption step in a process wherein SO3 absorption energy is recovered from absorption acid in useful form.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: November 19, 2013
    Assignee: MECS Inc
    Inventor: Ernesto Vera-Castaneda
  • Patent number: 8580224
    Abstract: Described is a method of increasing the sulfuric acid concentration of a first aqueous sulfuric acid solution with a sulfuric acid concentration of 82-89% to a concentrated sulfuric acid solution with a sulfuric acid concentration of at least 90%, including evaporating water from the first aqueous sulfuric acid solution in an evaporator vessel to the concentrated sulfuric acid solution, pumping around a mixture of the first aqueous sulfuric acid solution, part of the concentrated sulfuric acid solution, a second aqueous sulfuric acid solution, and hydrogen peroxide through an enameled piping system comprising the evaporator vessel and one or more heaters and pumps, wherein the piping system is operating at a temperature of at least 180° C., and the sulfuric acid concentration of the second aqueous sulfuric acid solution is at least 90%.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: November 12, 2013
    Assignee: Teijin Aramid B.V.
    Inventors: Hendrikus Johannes Koehorst, Teunis Leendert Boer
  • Patent number: 8562928
    Abstract: A process for making molecular hydrogen, elemental sulfur and sulfur dioxide from hydrogen sulfide. The process involves contacting a gas stream of hydrogen sulfide within a contacting zone with a contacting composition comprising metal sulfide in a lower sulfided state and yielding from the contacting zone a product gas stream comprising hydrogen and a recovered contacting composition comprising metal sulfide in a higher sulfided state. The higher metal sulfide is regenerated with oxygen to yield elemental sulfur and sulfur dioxide.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: October 22, 2013
    Assignee: Shell Oil Company
    Inventor: Puneet Gupta
  • Publication number: 20130236389
    Abstract: Described is a method of increasing the sulfuric acid concentration of a first aqueous sulfuric acid solution with a sulfuric acid concentration of 82-89% to a concentrated sulfuric acid solution with a sulfuric acid concentration of at least 90%, including evaporating water from the first aqueous sulfuric acid solution in an evaporator vessel to the concentrated sulfuric acid solution, pumping around a mixture of the first aqueous sulfuric acid solution, part of the concentrated sulfuric acid solution, a second aqueous sulfuric acid solution, and hydrogen peroxide through an enameled piping system comprising the evaporator vessel and one or more heaters and pumps, wherein the piping system is operating at a temperature of at least 180° C., and the sulfuric acid concentration of the second aqueous sulfuric acid solution is at least 90%.
    Type: Application
    Filed: October 26, 2011
    Publication date: September 12, 2013
    Applicant: TEIJIN ARAMID B.V.
    Inventors: Hendrikus Johannes Koehorst, Teunis Leendert Boer
  • Patent number: 8518365
    Abstract: The invention relates to a method and an installation for producing sulfuric acid. First of all, a product gas flow (5) containing sulfur dioxide is produced. The product gas flow (5) is supplied to a reaction chamber (1). A catalyst (3) is located in the reaction chamber (1). In the presence of the catalyst sulfur dioxide reacts to form sulfur trioxide. In further parts of the installation the resulting sulfur trioxide is converted to sulfuric acid. According to the invention, an oxidizing gas flow (6) is supplied to the reaction chamber (1) alternately with the product gas flow (5).
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: August 27, 2013
    Assignee: ThyssenKrupp Uhde GmbH
    Inventors: Jan Schoeneberger, Holger Thielert
  • Patent number: 8518357
    Abstract: Methods, systems, and apparatus for managing sulfur are disclosed. In some embodiments, the method comprise the following: obtaining material containing sulfur; refining the material to develop a high sulfur content heavy fraction fuel oil and a low sulfur content light fraction fuel oil; burning the low sulfur content light fraction fuel oil in apparatus that emit to the atmosphere; burning the high sulfur content heavy fraction fuel oil to produce energy thereby generating flue gas containing sulfur oxide; and removing and disposing of sulfur in the flue gas using a sulfur sequestration system that includes utilizing sulfur removed from the flue gas to form a brine material.
    Type: Grant
    Filed: May 5, 2009
    Date of Patent: August 27, 2013
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Klaus S. Lackner, Tim A. Rappold
  • Publication number: 20130157845
    Abstract: Activated carbon is rendered more thermally stable by exposure to a non-halogenated additive, and optionally to a halogen and/or a halogen-containing compound. Such treated carbon is suitable for use in mitigating the content of hazardous substances in flue gases, especially flue gases having a temperature within the range of from about 100° C. to about 420° C.
    Type: Application
    Filed: August 19, 2011
    Publication date: June 20, 2013
    Applicant: ALBEMARLE CORPORATION
    Inventors: Christopher J. Nalepa, William S. Pickrell, Gregory H. Lambeth, Qunhui Zhou
  • Patent number: 8444942
    Abstract: The present invention provides for process for inhibiting the levels of nitrogen oxides in process gas streams from sulfuric acid regeneration and sulfuric acid production plants. Partial oxidation of the nitrogen oxides is achieved by feeding a sub stoichiometric amount of ozone as to nitrogen oxides to the process gas stream.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: May 21, 2013
    Assignee: Linde Aktiengesellschaft
    Inventor: Naresh Suchak
  • Publication number: 20130115159
    Abstract: This invention relates to the recovery of energy in the manufacture of sulfuric acid, and more particularly to enhanced recovery of energy from the absorption of wet SO3 in sulfuric acid. The invention is further directed to control of mist formation during SO3 absorption, and of the sulfuric acid mist content of the gas stream leaving the SO3 absorption step in a process wherein SO3 absorption energy is recovered from absorption acid in useful form.
    Type: Application
    Filed: January 20, 2011
    Publication date: May 9, 2013
    Applicant: MECS Inc.
    Inventor: Ernesto Vera-Castaneda
  • Publication number: 20130071314
    Abstract: A process for making molecular hydrogen, elemental sulfur and sulfur dioxide from hydrogen sulfide. The process involves contacting a gas stream of hydrogen sulfide within a contacting zone with a contacting composition comprising metal sulfide in a lower sulfided state and yielding from the contacting zone a product gas stream comprising hydrogen and a recovered contacting composition comprising metal sulfide in a higher sulfided state. The higher metal sulfide is regenerated with oxygen to yield elemental sulfur and sulfur dioxide.
    Type: Application
    Filed: September 21, 2011
    Publication date: March 21, 2013
    Applicant: SHELL OIL COMPANY
    Inventor: Puneet GUPTA
  • Publication number: 20130058854
    Abstract: A process for the conversion of sulphur dioxide contained in a feed gas to sulphur trioxide, comprising the steps of a) alternatingly providing a first feed gas containing a high concentration of sulphur dioxide and a second feed gas containing a low concentration of sulphur dioxide as a process gas, b) preheating the process gas by heat exchange with a heat exchange medium, c) reacting the process gas in the presence of a catalytically active material in a catalytic reaction zone, d) converting at least in part the sulphur dioxide of the process gas into sulphur trioxide contained in a product gas in the catalytic reaction zone, e) cooling the product gas by contact with a heat exchange medium, wherein a thermal buffer zone is provided in relation to one of said process steps, providing thermal energy produced during super-autothermal operation for heating the process gas during sub-autothermal operation.
    Type: Application
    Filed: May 13, 2011
    Publication date: March 7, 2013
    Applicant: HALDOR TOPSOE A/S
    Inventors: Martin Møllerhøj, Mads Lykke, Morten Thellefsen, Peter Schoubye
  • Publication number: 20120308473
    Abstract: A method for adjusting a concentration of an acid or lye includes charging a medium for adjusting the concentration of the acid or lye into a supply conduit of the acid or lye so as to provide a combined stream. The combined stream is supplied through an inlet to a mixing chamber such that the combined stream is deflected upon entering the mixing chamber. The combined stream is mixed in the mixing chamber. The combined stream is discharged through an outlet of the mixing chamber such that the combined stream is again deflected upon being discharged from the mixing chamber.
    Type: Application
    Filed: January 11, 2011
    Publication date: December 6, 2012
    Applicant: OUTOTEC OYJ
    Inventors: Karl-Heinz Daum, Henry Eisermann, Wolfram Schalk
  • Publication number: 20120295812
    Abstract: The invention provides a method for extracting a Staphylococcus aureus antigen which comprises using an extraction reagent with a pH of no higher than 5.0, containing one or more acids selected from among hydrochloric acid, acetic acid, citric acid, phosphoric acid, sulfuric acid and nitric acid, to extract a Staphylococcus aureus antigen comprising a methicillin-resistant Staphylococcus aureus antigen and/or a methicillin-sensitive Staphylococcus aureus antigen, from Staphylococcus aureus in a specimen. The invention further provides a method for assessing Staphylococcus aureus.
    Type: Application
    Filed: December 22, 2010
    Publication date: November 22, 2012
    Inventor: Kazuki Shiga
  • Patent number: 8303925
    Abstract: A method of manufacturing ultra-pure sulfuric acid is described. Industrial sulfur trioxide is used as the raw material, gasifying it in a round gasifier, getting it gasified for the second time after condensation, sulfur trioxide gas has been purified. Absorbing the sulfur trioxide gas with the dilute sulfuric acid circularly, collect the target product of ultra-pure sulfuric acid. The main content of the ultra-pure sulfuric acid obtained by the method of the present invention can reach more than 96 wt %, the content of the impurities of metal ions, is in conformity with the SEMI C12 standard.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: November 6, 2012
    Assignee: Asian Union Electronic Chemical Corp. Shanghai
    Inventors: Jiarong Zhan, Curtis Dove, I-Hsing Lin
  • Publication number: 20120252999
    Abstract: Systems and methods of producing chemical compounds are disclosed. An example chemical production system includes a combustion chamber having intake ports for entry of a gas mixture. An igniter ignites the gas mixture in the intake chamber to facilitate a reaction at a high temperature and high pressure. A nozzle restricts exit of the ignited gas mixture from the combustion chamber. An expansion chamber cools the ignited gas. The expansion chamber has an exhaust where the cooled gas exits the expansion chamber. A chemical compound product is formed in the expansion chamber.
    Type: Application
    Filed: April 12, 2012
    Publication date: October 4, 2012
    Inventor: Bruce H. Peters
  • Publication number: 20120171110
    Abstract: The invention relates to a method and an installation for producing sulfuric acid. First of all, a product gas flow (5) containing sulfur dioxide is produced. The product gas flow (5) is supplied to a reaction chamber (1). A catalyst (3) is located in the reaction chamber (1). In the presence of the catalyst sulfur dioxide reacts to form sulfur trioxide. In further parts of the installation the resulting sulfur trioxide is converted to sulfuric acid. According to the invention, an oxidizing gas flow (6) is supplied to the reaction chamber (1) alternately with the product gas flow (5).
    Type: Application
    Filed: July 12, 2010
    Publication date: July 5, 2012
    Applicant: THYSSENKRUPP UHDE GMBH
    Inventors: Jan Schoeneberger, Holger Thielert
  • Patent number: 8173090
    Abstract: Sulfur dioxide (SO2) is removed from carbon dioxide feed gas comprising SO2 as a contaminant by maintaining the carbon dioxide feed gas at an elevated pressure in contact with an alkaline sorbent for a period of time sufficient to react said alkaline sorbent with SO2. Where NOx, oxygen (O2) and water are also present, not only is the rate of reaction with the sorbent increased, but also additional SO2 is removed by conversion to sulfuric acid, and NOx is removed as nitric acid. The method has particular application in the removal of SO2 and NOx from flue gas produced by oxyfuel combustion of a hydrocarbon or carbonaceous fuel.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: May 8, 2012
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Francis Peter Petrocelli, Kevin Boyle Fogash, Vincent White
  • Publication number: 20120087856
    Abstract: Configurations herein include a novel process and apparatus for generating and maintaining sulfur trioxide gas. The generation system and process operate to provide sulfur trioxide calibration gas for calibrating sulfur trioxide detection devices. The system and process provides a known, concentration of sulfur trioxide gas via a heated catalyst, which enables accurate calibration of measurement equipment. The system functions in part by controlling temperature, amount of moisture, residence time, catalyst selection, diluting generated sulfur trioxide and by locating the sulfur trioxide generator at a point of injection of a sulfur trioxide detection system.
    Type: Application
    Filed: October 3, 2011
    Publication date: April 12, 2012
    Inventors: Dieter KITA, Yongquan LI, Jeffrey SOCHA, Bryan A. MARCOTTE
  • Publication number: 20120067173
    Abstract: A system which uses available waste acid process streams from hydrometallurgical extraction processes as absorption media for the direct production of leach grade acid solutions for return to the hydrometallurgical processing circuit for use in liberating metals from metal-bearing materials.
    Type: Application
    Filed: November 29, 2011
    Publication date: March 22, 2012
    Inventor: Eric H. PARTELPOEG
  • Publication number: 20110311433
    Abstract: A process and system for production of concentrated sulphuric acid from sulphuric acid by stripping the sulphuric acid with dried air. The concentration of the sulphuric acid is 90-98% by weight, and the concentration of the concentrated sulphuric acid is 95-98.8% by weight. The air is dried in a dehumidifier. The sulphuric acid can be formed by cooling and condensing of a sulphur trioxide/water containing off-gas thus forming the sulphuric acid. The cooling and condensing can take place in an air cooler, and if an absorption dryer is used, it can be regenerated by warm air being cooling air transferred from the outlet of the air cooler.
    Type: Application
    Filed: June 17, 2010
    Publication date: December 22, 2011
    Inventors: Mads Lykke, Morten Mejlholm, Per Morsing