Carbon Dioxide Removed Patents (Class 95/183)
  • Patent number: 8007570
    Abstract: Systems, methods, and apparatus for capturing CO2 using a solvent are provided. A gas that includes carbon dioxide may be mixed with a solvent that is operable to absorb at least a portion of the carbon dioxide from the gas. The solvent containing the carbon dioxide may be provided to at least one removal system operable to remove at least a portion of the liquid contained in the solvent. The solvent output by the removal system may be stripped to extract at least a portion of the carbon dioxide from the solvent.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: August 30, 2011
    Assignee: General Electric Company
    Inventors: Chandrashekhar G. Sonwane, Samuel D. Draper
  • Patent number: 8007569
    Abstract: The invention relates to a method for removing hydrogen sulphide and other acidic gas components from pressurized technical gases by means of a physical detergent and for obtaining sulphur from hydrogen sulphide by using a Claus system. The hydrogen sulphide and the other acidic gas components are removed in an absorbent manner from the physical detergent, the physical detergent undergoes multi-step regeneration, said multi-step regeneration comprising at least one device for CO enrichment, a device for H2S enrichment, a device for CO2 stripping and a device for thermal regeneration. The various regeneration steps consist of various pressure steps and have a lower pressure than that of the absorption. A hydrogen sulphide rich Claus gas is withdrawn from one of the regeneration steps and is guided to a Claus system where sulphur is produced. The residual gas exiting from the Claus system is hydrated and is condensed under pressure, corresponding to one of the regeneration steps.
    Type: Grant
    Filed: July 12, 2004
    Date of Patent: August 30, 2011
    Assignee: Uhde GmbH
    Inventors: Georg Saecker, Johannes Menzel
  • Publication number: 20110203174
    Abstract: A method and apparatus for extracting CO2 from air, and for delivering that extracted CO2 to controlled environments, such as a greenhouse, or to open-air agricultural fields. The present disclosure allows the delivery of CO2 to be made at times of highest demand. The present disclosure contemplates several geometric configurations to enhance the CO2 extraction process. The present disclosure also provides a method of delivering the CO2 to the controlled environment in response to demand, such as for example, by using a secondary sorbent as a buffer to store extracted CO2.
    Type: Application
    Filed: August 11, 2009
    Publication date: August 25, 2011
    Inventor: Klaus S. Lackner
  • Patent number: 7981196
    Abstract: An apparatus and method for absorbing and recovering carbon dioxide from flue gas using ammonia water as an absorbent, including an absorption column and a circulation cooler connected to the absorption column so that a high-temperature absorbent is recovered from the absorption column, cooled to a preset temperature, and then supplied again into the absorption column, in order to dissipate absorptive heat generated when carbon dioxide is absorbed from the flue gas.
    Type: Grant
    Filed: June 2, 2008
    Date of Patent: July 19, 2011
    Assignees: POSCO, Research Institute of Industrial Science & Technology
    Inventors: Ki Joon Kang, Young Bong Lee, Kwang Hyun Kim, Je Young Kim
  • Patent number: 7967895
    Abstract: For regenerating the loaded washing (scrubbing) agent (6, 7) from a physical gas wash (T1), in which one or more gas components are removed, to a large extent selectively, from a gas mixture (1) to be purified at least in a first of at least two successive washing steps, the loaded washing agent (7) withdrawn from the first washing step is, independently of the remaining quantity of loaded washing agent (6), subjected to a regeneration step (T2a) for separating the gas components (11) which have been selectively removed from the raw gas in the first washing step.
    Type: Grant
    Filed: March 27, 2007
    Date of Patent: June 28, 2011
    Assignee: Linde AG
    Inventors: Ulrich Prüssner, Horst Weiss
  • Patent number: 7964025
    Abstract: Systems and techniques for the reclamation of carbon dioxide from boiler flue gas as well as for the liquefaction of the reclaimed carbon dioxide for well injection oil recovery are provided. A system can include a boiler, tower scrubber, carbon dioxide absorber, regenerator, reboiler, rectifying tower, condenser and mixing tank. Mixed gases of carbon dioxide and nitrogen for well injection may be reclaimed from boiler flue gas when steam is produced resulting in an increase of crude oil output increase while lessening environmental impact. Related systems, apparatus, methods, and articles are also described.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: June 21, 2011
    Assignee: Liaohe Petroleum Exploration Bureau, CNPC
    Inventors: Fengshan Zhang, Yuanwen Gao
  • Publication number: 20110139003
    Abstract: A method for separating carbon dioxide from a flue gas of a fossil fuel-operated power plant is provided. In the method, a fossil fuel is initially burned in a combustion process, wherein a hot waste gas containing carbon dioxide is produced. In a next process step, waste gas containing carbon dioxide is brought into contact with an absorption medium in an absorption process, wherein carbon dioxide is absorbed by the absorption medium, thus forming a charged absorption medium. Next, gaseous carbon dioxide is thermally expelled from the charged absorption medium in a desorption process. For this purpose, a vapor is supplied to the desorption process, the vapor is injected into the charged absorption medium, wherein the condensation heat released by the condensation of the vapor is transferred to the charged absorption medium, and the partial pressure of the carbon dioxide is simultaneously reduced in the desorption unit.
    Type: Application
    Filed: May 14, 2009
    Publication date: June 16, 2011
    Inventors: Ralph Joh, Rüdiger Schneider, Henning Schramm
  • Patent number: 7938889
    Abstract: A CO2 recovery system includes an absorption tower that removes CO2 from exhaust gas, a regeneration tower that regenerates a rich solution, and a separation drum that condensates steam in CO2 gas released from the regeneration tower and separates water. The CO2 recovery system further includes a filtration membrane apparatus that filters solid content remaining in the lean solution using a filter, and cleans the filter using condensed water as cleaning water and again return the condensed water into the system. The CO2-absorbing solution attached to the filter is collected and the filter is cleaned without diluting the CO2-absorbing solution upon replacement of the filter.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: May 10, 2011
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventor: Masaki Iijima
  • Publication number: 20110100217
    Abstract: A method for recovering carbon dioxide (CO2) from a gas stream is disclosed. The method includes the step of reacting CO2 in the gas stream with fine droplets of a liquid absorbent, so as to form a solid material in which the CO2 is bound. The solid material is then transported to a desorption site, where it is heated, to release substantially pure CO2 gas. The CO2 gas can then be collected and used or transported in any desired way. A related apparatus for recovering carbon dioxide (CO2) from a gas stream is also described herein.
    Type: Application
    Filed: October 30, 2009
    Publication date: May 5, 2011
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Grigorii Lev Soloveichik, Robert James Perry, Benjamin Rue Wood, Sarah Elizabeth Genovese
  • Patent number: 7918926
    Abstract: A CO2 recovery system includes an absorption tower and a regeneration tower. CO2 rich solution is produced in the absorption tower by absorbing CO2 from CO2-containing gas. The CO2 rich solution is conveyed to the regeneration tower where lean solution is produced from the rich solution by removing CO2. A regeneration heater heats lean solution that accumulates near a bottom portion of the regeneration tower with saturated steam thereby producing steam condensate from the saturated steam. A steam-condensate heat exchanger heats the rich solution conveyed from the absorption tower to the regeneration tower with the steam condensate.
    Type: Grant
    Filed: March 14, 2005
    Date of Patent: April 5, 2011
    Assignees: Mitsubishi Heavy Industries, Ltd., Kansai Electric Power Co., Inc.
    Inventors: Masaki Iijima, Takashi Kamijo, Takahito Yonekawa, Tomio Mimura, Yasuyuki Yagi
  • Patent number: 7909914
    Abstract: The present invention relates to a method of removing acid gases, notably carbonyl sulfide, contained in gaseous effluents, comprising: an acid gas absorption stage by contacting the gaseous effluent with an aqueous solution comprising 2-[2-amino-1-(aminomethyl)ethoxy]ethanol, and possibly another alkanolamine and an organic compound, and at least one aqueous solution regeneration stage. The method can comprise a second aqueous solution regeneration stage. The regeneration stages are carried out by expansion and/or thermal regeneration.
    Type: Grant
    Filed: July 11, 2008
    Date of Patent: March 22, 2011
    Assignee: IFP
    Inventors: Renaud Cadours, Julia Magne-Drisch, Bruno Delfort
  • Publication number: 20110052453
    Abstract: A method and apparatus for removing carbon dioxide and other pollutants from a gas stream having components that work synergistically. The invention includes an ammonia based scrubbing solution for SO2 scrubbing; an SO2 absorption section (250) to create contact between the flue gas and the ammonia based scrubbing solution to remove SO2 from the flue gas; a wet electrostatic precipitator to remove aerosols and fine particulate matter from the flue gas; a regenerable carbonate scrubbing solution for CO2 scrubbing, a CO2 absorption section (252) for removal of CO2 adapted to create contact between the flue gas and the scrubbing solution and which operates at a temperature between 32 and 66 degrees C.
    Type: Application
    Filed: October 31, 2008
    Publication date: March 3, 2011
    Inventors: Christopher McLarnon, Joanna Duncan, Francis Alix, Aytac Sezgi, Wade Amos, Roberto Bosco, Brian Grandjean, Michelle Livingston
  • Patent number: 7883569
    Abstract: Produced natural gas containing carbon dioxide is dehydrated and chilled to liquefy the carbon dioxide and then fractionated to produce a waste stream of liquid carbon dioxide and hydrogen sulfide. Natural gas liquids may be first separated and removed before fractionation. After fractionation, the waste stream is pressurized and transmitted to a remote injection well for injection either for disposal of the waste stream and preferably to urge hydrocarbons toward the producing well. A hydrocarbon stream proceeds from fractionation to a methanol absorber system which removes carbon dioxide gas. The hydrocarbon stream is thereafter separated into at least hydrocarbon gas, nitrogen and helium. Some of the nitrogen is reintroduced into a fractionation tower to enhance the recovery of hydrocarbons. A methanol recovery system is provided to recover and reuse the methanol. The hydrocarbons are sold as natural gas; and the helium is recovered and sold. Excess nitrogen is vented.
    Type: Grant
    Filed: February 12, 2007
    Date of Patent: February 8, 2011
    Inventor: Donald Leo Stinson
  • Patent number: 7862788
    Abstract: A chilled ammonia based CO2 capture system and method is provided. A promoter is used to help accelerate certain capture reactions that occur substantially coincident to and/or as a result of contacting a chilled ammonia based ionic solution with a gas stream that contains CO2.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: January 4, 2011
    Assignee: ALSTOM Technology Ltd
    Inventors: Eli Gal, Otto Morten Bade, Indira Jayaweera, Gopala Krishnan
  • Patent number: 7850763
    Abstract: Impure carbon dioxide (“CO2”) comprising a first contaminant selected from the group consisting of oxygen (“O2”) and carbon monoxide (“CO”) is purified by separating expanded impure carbon dioxide liquid in a mass transfer separation column system. The impure carbon dioxide may be derived from, for example, flue gas from an oxyfuel combustion process or waste gas from a hydrogen (“H2”) PSA system.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: December 14, 2010
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Vincent White, Rodney John Allam
  • Publication number: 20100288126
    Abstract: The present invention relates to a process for separating off CO2 from a gas stream, wherein in a second step the CO2 is removed from the CO2-absorbing agent by means of phase separation.
    Type: Application
    Filed: July 31, 2007
    Publication date: November 18, 2010
    Applicant: Universitat Dortmund
    Inventors: David Agar, Yudy Halim Tan, Zhang Xiaohui
  • Patent number: 7819951
    Abstract: A first contaminant selected from oxygen and carbon monoxide is removed from impure liquid carbon dioxide using a mass transfer separation column system which is reboiled by indirect heat exchange against crude carbon dioxide fluid, the impure liquid carbon dioxide having a greater concentration of carbon dioxide than the crude carbon dioxide fluid. The invention has particular application in the recovery of carbon dioxide from flue gas generated in an oxyfuel combustion process or waste gas from a hydrogen PSA process. Advantages include reducing the level of the first contaminant to not more than 1000 ppm.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: October 26, 2010
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Vincent White, Rodney John Allam
  • Publication number: 20100236408
    Abstract: A process for removing carbon dioxide from a fluid flow, wherein a) the fluid flow is brought into contact with an absorption agent which contains a solution of ammonia and at least one amino carboxylic acid and/or amino sulfonic acid, a charged absorption agent being obtained, and b) the charged absorption agent is regenerated while releasing carbon dioxide. The additional use of the amino carboxylic acid and/or amino sulfonic acid increases the circulation absorption capacity of the absorption agent.
    Type: Application
    Filed: November 14, 2008
    Publication date: September 23, 2010
    Applicant: BASF SE
    Inventors: Norbert Asprion, George Sider, Ute Lichtfers, Hugo Rafael Garcia Andarcia
  • Publication number: 20100186591
    Abstract: A system and method for handling waste gas including separation of CO2 is disclosed. The system includes a horizontal tunnel with a sequence of sections including a cooling section, a CO2 absorption section and a cleansing section. The system further comprises a heat exchanger for heating the CO2 depleted waste gas before it is introduced into the chimney with heat from the incoming untreated waste gas.
    Type: Application
    Filed: June 18, 2008
    Publication date: July 29, 2010
    Applicant: STATOIL ASA
    Inventors: Otto Skovholt, Svein Berg, Geir Johan Rortveit
  • Patent number: 7754102
    Abstract: This invention discloses a method for the reclaim of carbon dioxide and nitrogen from boiler flue gas, which includes: the flue gas enters into the water-washing and desulfurizing tower from the inferior part and contacts the sulfide solution flowing backward for the cleaning and desulfurizing of the flue gas; the desulfurized flue gas is introduced to the inferior part of the chemical absorber, where the contained carbon dioxide contacts the carbon dioxide adsorption liquid (containing, by the total weight of the liquid, of, besides water, 20-60% water solution of compound amine, 5-10% polyoxinolum, 1-5% antioxygen and 1-5% corrosion inhibitor) flowing backward; The adsorption liquid coming from the bottom of the absorber and having absorbed carbon dioxide, after heated when passing through heat exchangers, is sent to the top of the carbon dioxide regenerator and flows down through the packing layer; carbon dioxide is emitted out from the top of the regenerator; Nitrogen separated out from the top of the che
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: July 13, 2010
    Assignee: CNPC Greatwall Drilling Engineering Company Ltd.
    Inventors: Fengshan Zhang, Yuanwen Gao, Yongchun Zhang
  • Publication number: 20100170397
    Abstract: A process of removal of CO2 from a flue gas (2). The process comprises the steps of: a) providing a flue gas comprising CO2 (2), b) contacting the flue gas of step (a) with an ammonia-comprising medium (9), to absorb CO2 from said flue gas; and c) condensing ammonia (4) present in the flue gas leaving step (b), to remove ammonia from said flue gas. A system for removal of CO2 from a flue gas. A system for removal of CO2 from a flue gas. The system comprises a CO2 absorber (1) receiving the flue gas (2) and comprising an ammonia-comprising medium (9). The system further comprises an ammonia condenser (4) receiving flue gas (3) leaving the CO2 absorber.
    Type: Application
    Filed: June 25, 2008
    Publication date: July 8, 2010
    Inventor: Nader Padban
  • Patent number: 7749309
    Abstract: Disclosed is a method for deacidifying a fluid stream containing acidic gases as contaminants, according to which the fluid stream is brought into intimate contact with a washing liquid in at least one absorption step. Said washing liquid represents an aqueous solution containing a) tertiary aliphatic alkanolamines (alkanolamine A), at least 30 percent by weight of said tertiary aliphatic alkanolamines being 3-dimethylamino-1-propanol, and b) secondary aliphatic amines (activator B), at least 20 percent by weight of said secondary aliphatic amines being piperazin. The fluid stream which has been essentially purified of the acidic gases is then separated from the washing liquid that is loaded with acidic gases.
    Type: Grant
    Filed: March 4, 2003
    Date of Patent: July 6, 2010
    Assignee: BASF Aktiengesellschaft
    Inventors: Norbert Asprion, Christoph Grossmann
  • Publication number: 20100126348
    Abstract: Disclosed is a method for recovering carbon dioxide from a gas containing carbon dioxide, comprising the step (1) of bringing a gas containing carbon dioxide into contact with an aqueous solution containing 2-isopropylaminoethanol and at least one substance selected from the group consisting of piperazines and alkanolamines to absorb carbon dioxide into the aqueous solution; and the step (2) of heating the aqueous solution containing carbon dioxide absorbed therein, which is obtained in the step (1), to separate and recover carbon dioxide from the solution.
    Type: Application
    Filed: June 24, 2008
    Publication date: May 27, 2010
    Applicant: RESEARCH INSTITUTE OF INNOVATIVE TECHNOLOGY FOR THE EARTH
    Inventors: Shinkichi Shimizu, Firoz Alam Chowdhury, Hiromichi Okabe, Kazuya Goto
  • Publication number: 20100064889
    Abstract: Ultra cleaning of combustion gas to near zero concentration of residual contaminants followed by the capture of CO2 is provided. The high removal efficiency of residual contaminants is accomplished by direct contact cooling and scrubbing of the gas with cold water. The temperature of the combustion gas is reduced to 0-20 degrees Celsius to achieve maximum condensation and gas cleaning effect. The CO2 is captured from the cooled and clean flue gas in a CO2 absorber utilizing an ammoniated solution or slurry in the NH3—CO2—H2O system. The absorber operates at 0-20 degrees Celsius. Regeneration is accomplished by elevating the pressure and temperature of the CO2-rich solution from the absorber. The CO2 vapor pressure is high and a pressurized CO2 stream, with low concentration of NH3 and water vapor is generated. The high pressure CO2 stream is cooled and washed to recover the ammonia and moisture from the gas.
    Type: Application
    Filed: November 20, 2009
    Publication date: March 18, 2010
    Applicant: EIG, Inc.
    Inventor: Eli Gal
  • Patent number: 7666251
    Abstract: Method of purifying a feed stream containing carbon dioxide wherein the feed stream after having been compressed and dried is partly cooled and then used to reboil a stripping column. Thereafter, the feed stream is further cooled and expanded to a lower operational temperature of the stripping column. A carbon dioxide product stream composed of the liquid column bottoms of the stripping column is expanded at one or more pressures to generate refrigeration, then fully vaporized within the main heat exchanger and compressed by a compressor to produce a compressed carbon dioxide product. Refrigeration is recovered in the main heat exchanger from a column overhead stream extracted from the stripping column within the main heat exchanger either directly or indirectly by auxiliary processing in which carbon dioxide is further separated and optionally recycled back to the main compressor used in compressing the feed stream.
    Type: Grant
    Filed: April 3, 2006
    Date of Patent: February 23, 2010
    Assignee: Praxair Technology, Inc.
    Inventors: Minish Mahendra Shah, Henry Edward Howard
  • Publication number: 20100024647
    Abstract: A method for separating methane and carbon dioxide from biogas and a device are intended for purifying biogas, wherein carbon dioxide is separated off from the biogas. The method is distinguished by an energetically favorable mode of operation. The biogas is passed under atmospheric pressure and standard temperature into an absorption column. While the biogas ascends through a packed bed, which has a surface area of 600 to 1200 m2/m3, and at a space velocity of 5 to 40 Nm3/m3h, carbon dioxide present in the biogas is bound in a wash liquid by chemosorption. The purified methane gas is taken off at the top of the absorption column at a defined flow velocity. Carbon dioxide bound in the wash liquid is removed by desorption at a relatively high pressure of 2 to 30 bar and a temperature of at least 120° C. Biogas may be separated into methane and CO2.
    Type: Application
    Filed: March 19, 2007
    Publication date: February 4, 2010
    Applicant: DGE DR.-ING. GÜNTHER ENGINEERING GMBH
    Inventor: Lothar Günther
  • Publication number: 20090320682
    Abstract: The invention relates to an absorbent, comprising an aqueous solution (A) of at least one amino acid salt of the formula (I), wherein R1 and R2 independently from each other represent alkyl or hydroxyalkyl, R is hydrogen, alkyl or hydroxyalkyl, or a group R together with R1 is alkylene, M is an alkali metal, and n an integer from 1 to 6, and (B) of at least one primary alkanolamine, which is substantially free of inorganic alkaline salts. The absorbent is used in a method for removing carbon dioxide from a gas flow, particularly combustion exhaust gases. Preferred amino acid salts (A) are N,N-dimethylamino acetic acid potassium salt, N,N-diethylamino acetic acid potassium salt and N-ethyl-N-dimethylamino acetic acid-potassium salt. Preferred alkanolamines (B) are 2-aminoethanol, 3-aminopropanol, 4-aminobutanol, 2-aminobutanol, 5-aminopentanol, 2-aminopentanol and 2-(2-aminoethoxy)ethanol.
    Type: Application
    Filed: August 27, 2007
    Publication date: December 31, 2009
    Applicant: BASF SE Patents, Trademarks and Licenses
    Inventors: Rupert Wagner, Ute Lichtfers, Volker Schuda
  • Patent number: 7604684
    Abstract: With the help of a method of selective removal of hydrogen sulphides, organic sulphur components and CO2 from crude gases, by using a first and second absorption stage (41 or 49) for separating almost pure CO2, a solution has to be found, with which, among other things, hydrogen sulphides and organic sulphur compounds can be removed in as selective a manner as possible. This is achieved as follows: the absorption agent coming out of the first absorption stage (41) and enriched with hydrogen sulphide and CO2 a.o.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: October 20, 2009
    Assignee: Uhde GmbH
    Inventor: Johannes Menzel
  • Patent number: 7597746
    Abstract: A gas (1) comprising hydrogen sulfide, carbon dioxide, and hydrocarbon contaminants is treated in a plant (FIG. 2) in a configuration in which waste streams are recycled to extinction. In especially preferred aspects of contemplated methods and configurations, hydrogen sulfide and other sulfurous components are converted to a sulfur product (37), carbon dioxide (44A) is separated at a purity sufficient for enhanced oil recovery or sale, and hydrocarbon contaminants are purified to a marketable hydrocarbon product (49).
    Type: Grant
    Filed: February 12, 2003
    Date of Patent: October 6, 2009
    Assignee: Fluor Technologies Corporation
    Inventors: John Mak, Curt Graham
  • Publication number: 20090199711
    Abstract: A description is given of a process for removing carbon dioxide from gas streams in which the partial pressure of the carbon dioxide is less than 200 mbar, in particular flue gases, the gas stream being contacted with a liquid absorption medium which comprises an aqueous solution (A) of a tertiary aliphatic alkanolamine and (B) an activator of the formula R1—NH—R2—NH2, where R1 is C1-C6-alkyl and R2 is C2-C6-alkylene, the sum of the concentrations of A and B being 2.5 to 7 mol/l, and the molar ratio of B to A being in the range of 1:3 to 1.5:1. The activator is, for example, 3-methylaminopropylamine, the tertiary aliphatic amine methyldiethanolamine, methyidiisopropanolamine or n-butyldiethanolamine. The process permits substantial removal of carbon dioxide and the regeneration of the absorption medium is possible with relatively low energy consumption.
    Type: Application
    Filed: June 13, 2007
    Publication date: August 13, 2009
    Inventors: Norbert Asprion, Iven Clausen, Ute Lichtfers
  • Publication number: 20090101868
    Abstract: This invention discloses a method for the reclaim of carbon dioxide and nitrogen from boiler flue gas, which includes: the flue gas enters into the water-washing and desulfurizing tower from the inferior part and contacts the sulfide solution flowing backward for the cleaning and desulfurizing of the flue gas; the desulfurized flue gas is introduced to the inferior part of the chemical absorber, where the contained carbon dioxide contacts the carbon dioxide adsorption liquid (containing, by the total weight of the liquid, of, besides water, 20-60% water solution of compound amine, 5-10% polyxinolum, 1-5% antioxygen and 1-5% corrosion inhibitor) flowing backward; The adsorption liquid coming from the bottom of the absorber and having absorbed carbon dioxide, after heated when passing through heat exchangers, is sent to the top of the carbon dioxide regenerator and flows down through the packing layer; carbon dioxide is emitted out from the top of the regenerator; Nitrogen separated out from the top of the c
    Type: Application
    Filed: November 9, 2007
    Publication date: April 23, 2009
    Inventors: Fengshan Zhang, Yuanwen Gao
  • Patent number: 7459011
    Abstract: The natural gas arriving through pipe 1 is deacidified by being brought into contact with a solvent in zone C. The solvent charged with acid compounds is regenerated in zone R. The acid gases, released into pipe 5 upon regeneration, include a quantity of solvent. The method enables the solvent contained in the acid gases to be extracted. In zone ZA, the acid gases are brought into contact with a non-aqueous ionic liquid whose general formula is Q+ A?, where Q+ designates an ammonium, phosphonium, and/or sulfonium cation, and A? designates an anion able to form a liquid salt. The solvent is removed from the acid gases evacuated through pipe 6. The ionic liquid charged with solvent is regenerated by heating in an evaporator DE. The ionic liquid regenerated is recycled through pipes 8 and 9 to zone ZA. The solvent is evacuated through pipe 13.
    Type: Grant
    Filed: February 14, 2005
    Date of Patent: December 2, 2008
    Assignee: Institut Francais du Petrole
    Inventors: Renaud Cadours, Fabrice Lecomte, Lionel Magna, Cécile Barrere-Tricca
  • Publication number: 20080236390
    Abstract: A description is given of an absorption medium for removing carbon dioxide from gas streams which comprises aqueous solution of an amine of the formula I HNR2 ??(I) where one or both radicals are and the other radical R is hydrogen. The absorption medium is distinguished by particular oxidation resistance.
    Type: Application
    Filed: October 19, 2006
    Publication date: October 2, 2008
    Inventors: Joachim-Thierry Anders, Johann-Peter Melder, Norbert Asprion, Ole Brettschneider, Iven Clausen, Bernd Eck, Ute Lichtfers
  • Publication number: 20080223215
    Abstract: A CO2 recovery system includes an absorption tower and a regeneration tower. CO2 rich solution is produced in the absorption tower by absorbing CO2 from CO2-containing gas. The CO2 rich solution is conveyed to the regeneration tower where lean solution is produced from the rich solution by removing CO2. A reclaimer heats the lean solution that is produced in the regeneration tower to produce a condensed waste-product from the lean solution by condensing a depleted material contained in the lean solution, and removes the condensed waste-product. A cooler cools the condensed waste-product.
    Type: Application
    Filed: October 31, 2007
    Publication date: September 18, 2008
    Applicants: MITSUBISHI HEAVY INDUSTRIES, LTD., THE KANSAI ELECTRIC POWER CO., INC.
    Inventors: Masaki Iijima, Tomio Mimura, Yasuyuki Yagi
  • Patent number: 6989046
    Abstract: A method for removing polymer from an acid gas treating system comprising contacting an acid gas containing stream with an aqueous alkanolamine solution and hydrocarbon solvent to form a mixture of an alkanolamine rich solution having the acid gases or byproducts thereof contained therein and the hydrocarbon solvent, where the hydrocarbon solvent has about 60 to 100 volume % aromatics content; and about 50 to 85 volume % two ring aromatic content, based on the total volume of the solvent.
    Type: Grant
    Filed: March 2, 2000
    Date of Patent: January 24, 2006
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: David R. Slim, Ernest V. Vilcsak
  • Patent number: 6764530
    Abstract: An exhaust heat utilization method for a carbon dioxide recovery process comprises heating returning hot water by at least one heat exchange selected from heat exchange with the regenerated absorbing liquid after heat exchange, heat exchange with carbon dioxide exhausted from the regeneration tower, and heat exchange with saturated water after heating the bottom of the regeneration tower, thereby obtaining hot water.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: July 20, 2004
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventor: Masaki Iijima
  • Publication number: 20040065199
    Abstract: The natural gas is successively contacted in column CA with a relatively methanol-rich solvent flowing in through line 4, then with a relatively poor solvent flowing in through line 9. The acid gas-containing solvent recovered through line 3 at the bottom of column CA is expanded through valves V1 and V2 to release acid gases through line 6. A fraction of the expanded solvent is distilled in column CR. The regenerated solvent obtained at the bottom of column CR is sent to the top of column CA through line 9. A second fraction of the expanded solvent is mixed with a solvent drawn off from column CR at an intermediate point between the bottom and the top of this column. This mixture of solvents is sent through line 4 into column CA.
    Type: Application
    Filed: October 6, 2003
    Publication date: April 8, 2004
    Inventors: Alexandre Rojey, Fabrice Lecomte, Eric Lemaire
  • Patent number: 6666908
    Abstract: Within the scope of a process using two absorption sections for treating a natural gas containing CO2 and/or H2S, as well as mercaptans, COS and/or CS2, the present invention aims to wash the gaseous hydrocarbons desorbed upon expansion of the solvent from the first absorption section with the solvent from the second absorption section.
    Type: Grant
    Filed: January 29, 2002
    Date of Patent: December 23, 2003
    Assignee: Institut Francais du Petrole
    Inventors: Renaud Cadours, Fabrice Lecomte, Pascal Mougin
  • Patent number: 6645272
    Abstract: In a process for treating a gas containing acid gases, the gas is contacted with a methanol-containing aqueous phase and is then contacted in an absorption column with a mixture of solvents including mehtanol, water and a solvent heavier than methanol. Then, the mixture of solvents is at least partly regenerated through pressure reduction and/or heating. The treated gas is cooled by producing at least a methanol-containing aqueous phase that is at least partly recycled. The mixture of solvents flowing out at the bottom of the absorption column is cooled, then re-introduced at a higher level of the absorption column so as to control the temperature in the absorption column.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: November 11, 2003
    Assignee: Institute Francais du Petrole
    Inventors: Eric Lemaire, Jean-Charles Viltard
  • Patent number: 6607585
    Abstract: An improved method and structure for purification of an acid gas stream by using raw fuel gas as a stripper to remove the BTEX and VOCs from the liquid amine stream. The improved method is particularly useful for purification of acid gas streams with BTEX contaminant levels in excess of environmentally acceptable levels for standard processing. Raw fuel gas is utilized at moderate temperatures and pressures, the uptake of BTEX and VOCs reduces the level of these compounds in the waste amine stream to environmentally acceptable levels, and the remaining contaminants may then be dealt with by ordinary means. Levels of H2S and CO2. in the liquid amine stream are also reduced.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: August 19, 2003
    Inventor: David Morrow
  • Publication number: 20020124728
    Abstract: A method which reduces iron contamination of a system which receives ammonia from an ammonia recovery process by one or more of the following techniques:
    Type: Application
    Filed: May 2, 2001
    Publication date: September 12, 2002
    Inventors: Abraham Benderly, Michael Stanley DeCourcy, Ronald Eugene Myers
  • Publication number: 20020059865
    Abstract: Process for treating a gas containing acid gases, wherein:
    Type: Application
    Filed: September 24, 2001
    Publication date: May 23, 2002
    Inventors: Eric Lemaire, Jean-Charles Viltard
  • Patent number: 6342091
    Abstract: A process for the removal of carbon dioxide, sulphur compounds, water and aromatic and higher aliphatic hydrocarbons from industrial gases. The sour gas components, water and hydrocarbons are removed from the gas to be treated by absorption at elevated operating pressure. At least one morpholine derivative is used as the absorbent. The absorbent laden with absorbed components is regenerated with the aid of a stripping gas. The stripping gas is generated by partial evaporation of the laden absorbent.
    Type: Grant
    Filed: January 21, 2000
    Date of Patent: January 29, 2002
    Assignee: Krupp Uhde GmbH
    Inventors: Johannes Menzel, Oliver Tondorf
  • Patent number: 6334886
    Abstract: A process is provided for removing CO2 and/or H2S from a gas mixture containing as impurities CO2 and/or H2S and at least one other impurity selected from the group consisting of a cyanide and ammonia. The process includes contacting at least a portion of the reflux stream from the overhead vapor from a stripping column of an acid gas removal solvent (i.e., alkanolamine) treatment plant with an anion exchange resin to remove corrosive impurities. The ion-exchanged reflux stream is then recycled to the top of the stripping column or into the bulk circulating acid gas removal solvent (i.e., alkanolamine) passing from the bottom of the stripping column.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: January 1, 2002
    Assignee: Air Products and Chemicals, Inc.
    Inventors: David Richard Barnes, Jr., Arthur Daniel Bixler
  • Patent number: 6290754
    Abstract: A regenerative process for deacidification of a gas containing CO2 and liquid hydrocarbons including contacting the gas to be treated, in an absorption zone, with an absorbent liquid including methyldiethanolamine (MDEA) and an accelerator of absorption of CO2 by the amine, thereby producing a treated gas with reduced CO2 content and an absorbent liquid loaded with CO2, subjecting the loaded absorbent liquid to a regeneration treatment to release CO2 which it has bound, to produce 1) at least one acid gas fraction rich in CO2 and 2) at least one regenerated absorbent liquid; and recycling into the absorption zone the at least one regenerated absorbent liquid, wherein the overall liquid hydrocarbon content in the gas to be deacidified containing CO2 is greater than 14 liters of liquid hydrocarbons per million standard cubic meters of gas, and the activator combined with methyldiethanolamine in the absorbent liquid brought into contact with the gas containing CO2 and liquid hydrocarbons consists of at least one
    Type: Grant
    Filed: December 20, 1999
    Date of Patent: September 18, 2001
    Assignee: Elf Exploration Production
    Inventors: Jean-Louis Peytavy, Serge Capdeville, Herve Lacamoire
  • Patent number: 6162282
    Abstract: A method for determining the efficiency of a carbon filter used to absorb hydrocarbons from organic solvents. A sample of the solution, used to remove CO.sub.2 and H.sub.2 S from natural hydrocarbon gases, is taken after it has passed through the carbon filter. A solution of an internal standard and carbon disulfide is added to the sample to concentrate the hydrocarbons into the solution. A second sample taken from the solution containing the concentrated hydrocarbons and is passed through a gas chromatograph which has a fast temperature ramp to measure the peak areas of the hydrocarbons and the internal standard. The concentration of the measured hydrocarbons are determined by comparing the peak area counts against that of the internal standard.
    Type: Grant
    Filed: May 10, 1999
    Date of Patent: December 19, 2000
    Assignee: Mobil Oil Corporation
    Inventors: Clifford C. Walters, Constance L. Hellyer
  • Patent number: 6139605
    Abstract: A double-loop process for the removal of specified gas or gases from a process gas by absorption with a liquid absorbent for said specified gas or gases wherein the process gas is contacted counter-currently in a first absorption stage with semi-lean absorbent liquid and then in a second absorption stage with lean absorbent liquid to give a sweet process gas and the absorbed gases are stripped from the laden absorbent liquid in a first stage giving a semi-lean absorbent liquid. Part of the semi-lean absorbent is recycled to the first absorption stage while the remainder is subjected to further stripping by counter-current contact with an auxiliary gas that has a concentration of the specified gas or gases that is lower than the concentration of the specified gas or gases in the process gas to give the lean absorbent liquid which is recycled to the second absorption stage.
    Type: Grant
    Filed: August 10, 1999
    Date of Patent: October 31, 2000
    Assignee: Imperial Chemical Industries PLC
    Inventors: Peter John Herbert Carnell, Hiren Krishnakant Shethna, Gavin Paul Towler, Edwin Stephen Willis
  • Patent number: 6102987
    Abstract: A process for the removal of CO.sub.2 and sulfur compounds from natural gas and raw synthesis gas wherein N-formylmorpholine and N-acetylmorpholine mixtures are used as the desorbent at temperatures between -20.degree. C. and +40.degree. C. at pressures of 10 to 150 bar in a scrubbing operation. The acid gases are removed from the absorbent by flashing and the regenerated absorbent is recycled to the absorbent.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: August 15, 2000
    Assignee: Krupp Uhde GmbH
    Inventors: Manfred Gross, Barbel Kolbe, Johannes Menzel, Werner Pohl
  • Patent number: 6001153
    Abstract: A method of treating a fluid containing at least methane and at least one acid gas and producing the acid gas or gases in liquid form. The method includes a step of regenerating the solvent, operated at a pressure whose value is at least equal to the bubble pressure of the mixture of acid gases produced in liquid form, a step in which the gaseous fraction from the regeneration step is rectified in a contact zone by separating at least some of the solvent from the gaseous fraction, a step in which the gaseous fraction from the modification step is cooled to a given temperature to cause at least some of the gaseous faction to condense forming at least one liquid fraction enriched with liquid acid gases and a step during which the liquid fraction of gases is separated from the remaining gaseous fraction.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: December 14, 1999
    Assignee: Institut Francais du Petrole
    Inventors: Etienne Lebas, Alexandre Rojey
  • Patent number: 5735936
    Abstract: The process comprises a cold absorption step 2 for removing acid gas from natural gas using a solvent phase at a pressure P.sub.2 which delivers a purified gas 5; a step for depressurizing and separating resultant acidic solvent phase containing hydrocarbons (lines 4, 11), at a pressure P.sub.12 which is lower than pressure P.sub.2 in a column-heat exchanger 12 which delivers a purified gaseous effluent 13 overhead and a further solvent phase at the bottom (line 17) which is enriched in hydrogen sulphide; and a solvent phase regeneration step carried out in a distillation column 18 at a pressure P.sub.18 and no higher than pressure P.sub.12. A gas 29 containing essentially hydrogen sulphide which is depleted in hydrocarbons is recovered from column 18 and is a suitable feed for a Claus plant for eliminating H.sub.2 S. The regenerated hot solvent phase 20 indirectly exchanges heat with the cold acidic solvent phase from absorber 2 or separator 6. It is then recycled to the absorbent after cooling.
    Type: Grant
    Filed: April 18, 1996
    Date of Patent: April 7, 1998
    Assignee: Institut Francais du Petrole
    Inventors: Ari Minkkinen, Joseph Larue, Pierre Capron