Recovery Of Carbon Dioxide Patents (Class 62/928)
  • Patent number: 8911535
    Abstract: A process for efficiently removing carbon dioxide from a hydrocarbon containing feed stream utilizing a membrane separation unit in conjunction with a heat exchanger and a carbon dioxide separation unit wherein the streams obtained in the carbon dioxide separation unit are utilized to provide the cooling effect in the heat exchanger.
    Type: Grant
    Filed: October 6, 2011
    Date of Patent: December 16, 2014
    Assignee: L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Sudhir S. Kulkarni, Edgar S. Sanders, Jr.
  • Patent number: 8863494
    Abstract: A turbine outlet frozen gas capture apparatus is provided and includes an enclosure divided into first and second chambers, the first chamber being receptive of turbine outlet exhaust including frozen gas, a wheel disposed and configured to be rotatable such that frozen gas received in the first chamber is captured and transported into the second chamber and a heater disposed within the second chamber and configured to vaporize the frozen gas transported therein to thereby produce vaporized gas.
    Type: Grant
    Filed: October 6, 2011
    Date of Patent: October 21, 2014
    Assignee: Hamilton Sundstrand Space Systems International, Inc.
    Inventor: James H. Fort
  • Patent number: 8857212
    Abstract: The invention provides a process for the separation of a contaminant or mixture of contaminants from a CH4-comprising gaseous feed stream, comprising the subsequent steps of: a) passing a CH4-comprising gaseous feed stream comprising the contaminant or the mixture of contaminants into and through a cold porous body having a temperature below the sublimation temperature of the contaminant or the mixture of contaminants and contacting the CH4-comprising gaseous feed stream at elevated pressure with the surface of the cold porous body to obtain a porous body comprising solid contaminant or mixture of contaminants and a contaminant-depleted product gas; and b) reducing the pressure to obtain fluid contaminant or mixture of contaminants and a cold porous body. c) removing the fluid contaminant or mixture of contaminants, wherein the contaminant is selected from CO2, hydrogen sulphide, mercaptans, siloxanes and carbonyl sulphide, or a mixture thereof.
    Type: Grant
    Filed: October 10, 2011
    Date of Patent: October 14, 2014
    Assignee: Shell Oil Company
    Inventors: Martin Van Sint Annaland, Martin Jan Tuinier
  • Patent number: 8852318
    Abstract: In a method for compressing a water-containing CO2-rich fluid wherein the CO2-rich fluid is compressed in a compressor located upstream from the compression step, an antifreeze agent is injected into the water-containing CO2-rich fluid in order to lower the water solidification temperature. The antifreeze agent-containing CO2-rich fluid is frozen, water is extracted from the frozen fluid, and the frozen fluid is compressed in the compressor.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: October 7, 2014
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'exploitation des Procedes Georges Claude
    Inventors: Alain Briglia, Arthur Darde
  • Patent number: 8734569
    Abstract: Disclosed are methods of obtaining carbon dioxide from a CO2-containing gas mixture. The methods combine the benefits of gas membrane separation with cryogenic temperatures.
    Type: Grant
    Filed: July 1, 2010
    Date of Patent: May 27, 2014
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: David J. Hasse, Sudhir S. Kulkarni, Edgar S. Sanders, Jr., Jean-Pierre Tranier, Paul Terrien
  • Patent number: 8663364
    Abstract: Disclosed are methods of obtaining carbon dioxide from a CO2-containing gas mixture. The methods combine the benefits of gas membrane separation with cryogenic temperatures.
    Type: Grant
    Filed: July 1, 2010
    Date of Patent: March 4, 2014
    Assignee: L'Air Liquide, Société Anonyme pour l'Étude et l'Éxploitation des Procédés Georges Claude
    Inventors: David J. Hasse, Sudhir S. Kulkarni, Edgar S. Sanders, Jr., Jean-Pierre Tranier, Paul Terrien
  • Patent number: 8617292
    Abstract: Disclosed are methods of obtaining carbon dioxide from a CO2-containing gas mixture. The methods combine the benefits of gas membrane separation with cryogenic temperatures.
    Type: Grant
    Filed: July 1, 2010
    Date of Patent: December 31, 2013
    Assignee: L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude
    Inventors: David J. Hasse, Sudhir S. Kulkarni, Edgar S. Sanders, Jr., Jean-Pierre Tranier, Paul Terrien
  • Patent number: 8511113
    Abstract: The invention provides a process for the separation of CO2 from a gaseous feed stream, comprising the subsequent steps of: a) cooling a porous body in the form of a fixed bed (101,102,103) to a temperature below the sublimation temperature of CO2 to obtain a cold body; b) contacting a gaseous feed stream (120) comprising CO2 and one or more other gaseous compounds with the surface of the cold body to obtain a body comprising solid CO2 and a CO2-depleted effluent gas (124); and c) removing the solid CO2 by exposing the porous body comprising solid CO2 to a fluid CO2 stream (130) having a temperature above the sublimation temperature of CO2 whereby fluid CO2 (136) and a warm porous body are obtained.
    Type: Grant
    Filed: October 10, 2008
    Date of Patent: August 20, 2013
    Assignee: Shell Oil Company
    Inventors: Gerrit Jan Barend Assink, Gert Jan Kramer, Martin Van Sint Annaland, Martin Jan Tuinier
  • Patent number: 8505332
    Abstract: A method comprising receiving a hydrocarbon feed stream, separating the hydrocarbon feed stream into a heavy hydrocarbon rich stream and a carbon dioxide recycle stream, separating the carbon dioxide recycle stream into a natural gas liquids (NGL) rich stream and a purified carbon dioxide recycle stream, and injecting the purified carbon dioxide recycle stream into a subterranean formation. Included is a method comprising selecting a first recovery rate for a NGL recovery process, estimating the economics of the NGL recovery process based on the first recovery rate, selecting a second recovery rate that is different from the first recovery rate, estimating the economics of the NGL recovery process based on the second recovery rate, and selecting the first recovery rate for the NGL recovery process when the estimate based on the first recovery rate is more desirable than the estimate based on the second recovery rate.
    Type: Grant
    Filed: May 16, 2008
    Date of Patent: August 13, 2013
    Assignee: Pilot Energy Solutions, LLC
    Inventor: Eric Prim
  • Patent number: 8471087
    Abstract: Disclosed is a process for separating an acidic contaminant and light hydrocarbon of a light hydrocarbon feed having a large contaminating acidic contaminant content. Among other features, the process uses a combination of distillation and membrane separation arranged in a unique way to yield a high-purity light hydrocarbon product and a high-purity acidic contaminant product.
    Type: Grant
    Filed: May 17, 2010
    Date of Patent: June 25, 2013
    Assignee: Shell Oil Company
    Inventors: Zaida Diaz, Shu Shu, Paul Jason Williams
  • 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
  • Patent number: 7493779
    Abstract: The invention provides a method of removing solid carbon dioxide from cryogenic equipment, including the steps of: (a) introducing a stream including ethane to the cryogenic equipment to convert solid carbon dioxide to liquid form whereby a mixture of liquid ethane and liquid carbon dioxide is formed; and (b) removing the mixture of liquid ethane and liquid carbon dioxide from the cryogenic equipment. In particular, the method can be used in a liquefied natural gas (LNG) plant wherein cryogenic equipment contains LNG, and the method includes the steps of: (a?) removing the LNG from the cryogenic equipment; (a) introducing a stream including ethane to convert solid carbon dioxide to liquid form whereby a mixture of liquid ethane and liquid carbon dioxide is formed; and (b) removing the mixture of liquid ethane and liquid carbon dioxide from the cryogenic equipment. The result is an effective cleaning method for fouled LNG equipment.
    Type: Grant
    Filed: August 27, 2003
    Date of Patent: February 24, 2009
    Assignee: Shell Oil Company
    Inventor: Robert Amin
  • Publication number: 20090013717
    Abstract: A process for separating carbon dioxide from a carbon dioxide containing fluid comprises the steps of: compressing the fluid in a compressor to form a compressed fluid, drying at least part of the compressed fluid to form a compressed and dried fluid, cooling at least part of the compressed and dried fluid to form a compressed, dried and cooled fluid, separating the compressed, dried and cooled fluid at a temperature lower than 0° C. into a carbon dioxide rich stream, a carbon dioxide lean stream and at least one intermediate purity liquid stream having a carbon dioxide purity lower than that of the carbon dioxide rich stream and higher than that of the carbon dioxide lean stream, expanding at least one intermediate purity liquid stream to produce at least one expanded stream using at least one expanded stream to cool the compressed and dried fluid and recycling at least part of the expanded stream.
    Type: Application
    Filed: July 11, 2007
    Publication date: January 15, 2009
    Applicants: L'Air Liquide, Societe Anonyme our l'Etude et l'Exploitation des Procedes George Claude, Air Liquide Process & Construction, Inc.
    Inventors: Arthur DARDE, Bao Ha, Jean-Pierre Trainer
  • Patent number: 7461521
    Abstract: The invention relates to a system unit for desorbing carbon dioxide and other impurities from highly pressurized methanol. Said system unit comprises at least one or more expansion vessels arranged in succession, at least one heat exchanger, and at least one liquid/gas separator. The inventive system unit contains: a) a line (1) through which the intensely cooled methanol leaving expansion vessel (C) is introduced into the heat exchanger (E) from underneath, and; b) a line (2), though which the heated methanol is drawn out of the heat exchanger (E) from the top, and which serves to connect said heat exchanger to a liquid/gas separator inside of which the remaining carbon dioxide still contained in the methanol is desorbed and separated out to the greatest possible extent. This system unit enables the cold due to evaporation, said cold resulting during the desorption of carbon dioxide, to be obtained inside a heat exchanger and constitutes an important cold energy source for carrying out absorption.
    Type: Grant
    Filed: April 19, 2003
    Date of Patent: December 9, 2008
    Assignee: Lurgi AG
    Inventors: William Davey, Manfred Meyer
  • Patent number: 7201019
    Abstract: A method of separating one or more light components, such as helium, from a carbon dioxide containing stream. A two-phase stream is obtained, at least in part, by cooling a pressurized feed stream to at least partially condense such stream. The stream that is subsequently degassed to produce a first vapor stream enriched in the light component(s) and a first liquid stream containing an entrained fraction of the light component(s). The first liquid stream is expanded to create another two-phase stream that is degasified to produce a second vapor stream that is also enriched in the light component(s) and a second liquid stream having an enriched carbon dioxide content. The second liquid stream is repressurized and vaporized. In case of a supercritical feed, the pressurized feed stream is expanded after having been cooled. Thereafter, the feed is degassed to produce the light component enriched vapor stream and a liquid stream enriched in the carbon dioxide.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: April 10, 2007
    Assignee: Praxair Technology, Inc.
    Inventor: Henry Edward Howard
  • Patent number: 7076969
    Abstract: A system for the supply and delivery of a high or a ultrahigh purity (UHP) carbon dioxide product stream to at least one process tool within a manufacturing facility and method comprising same is disclosed herein. In one embodiment, the system is comprised of the following sub-systems: a carbon dioxide source, a carbon dioxide delivery system, and the point of use (POU) containing at least one process tool.
    Type: Grant
    Filed: January 19, 2004
    Date of Patent: July 18, 2006
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Vladimir Yliy Gershtein, Paul Anthony Mattiola, John Frederick Cirucci, John Christopher Ivankovits
  • Patent number: 7076970
    Abstract: A system for the bulk supply and delivery of a carbon dioxide product stream to at least one process tool in a plurality of applications at varying pressure, purity or other process parameter within a manufacturing facility and method comprising same is disclosed herein. In one embodiment, the system is comprised of: a carbon dioxide source, a carbon dioxide delivery system containing a low pressure delivery and distribution system, and a plurality of applications containing at least one process tool.
    Type: Grant
    Filed: January 19, 2004
    Date of Patent: July 18, 2006
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Vladimir Yliy Gershtein, Paul Anthony Mattiola
  • Patent number: 7069742
    Abstract: This invention relates to an improvement in a process and apparatus for delivering ultra high purity liquid carbon dioxide to a point of use at pressures above ambient without pumping. In the process a high purity carbon dioxide feed is charged to a vessel and at least partially solidified. Once filled, the slush or solid is isochorically heated, i.e., heated at constant vessel volume whereby the solid phase carbon dioxide is converted to a liquid. Liquid, then, is withdrawn from the vessel at a desired pressure at a rate at which the solid phase carbon dioxide is converted to a liquid. The improvement resides in effecting partial solidification and recycle of carbon dioxide.
    Type: Grant
    Filed: January 19, 2004
    Date of Patent: July 4, 2006
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Vladimir Yliy Gershtein
  • Patent number: 6960242
    Abstract: A carbon dioxide recovery apparatus and process for supercritical extraction includes providing a process stream from a supercritical extraction procedure in which the process stream includes pressurized carbon dioxide, extraction process waste and optionally at least one co-solvent; reducing the pressure of the process stream below critical pressure; venting low pressure carbon dioxide vapor to exhaust; cooling the process stream to form a two phase mixture; separating the two phase mixture into a process liquid, containing co-solvent if present, and a process vapor phase stream; collecting the process liquid; filtering the process vapor phase stream to remove particulates and optionally residual co-solvent; passing the filtered process vapor stream through an adsorber to remove trace impurities to form a purified carbon dioxide vapor stream; and, drying the purified carbon dioxide vapor stream to remove residual water vapor.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: November 1, 2005
    Assignee: The BOC Group, Inc.
    Inventors: Kelly Leitch, Gavin Hartigan, Robert D'Orazio
  • Publication number: 20040231358
    Abstract: Gases are vented from a waste site such as a landfill, and the gases are separated into at least three streams comprising a hydrocarbon stream, a carbon dioxide stream, and residue stream. At least a portion of the carbon dioxide stream and hydrocarbon stream are liquefied or converted to a supercritical liquid. At least some of the carbon dioxide gas stream (as a liquid or supercritical fluid) is used in a cleaning step, preferably a polymer cleaning step, and more preferably a polymer cleaning step in a polymer recycling process, and most preferably in a polymer cleaning step in a polymer recycling system where the cleaning is performed on-site at the waste site.
    Type: Application
    Filed: May 22, 2003
    Publication date: November 25, 2004
    Applicant: Cool Clean Technologies
    Inventors: Jon P. Wikstrom, Dan Schiller, Jon R. Turner
  • Patent number: 6477859
    Abstract: A system for producing carbon dioxide wherein carbon dioxide feed fluid is first processed in a cooling section of an integrated heat exchanger before purification in a column, and wherein column bottom fluid operates within one of an evaporating section and desuperheating section of the heat exchanger and refrigerant fluid operates within the other of the evaporating section and desuperheating section of the heat exchanger.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: November 12, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Kenneth Kai Wong, Dante Patrick Bonaquist, Henry Edward Howard
  • Patent number: 6475460
    Abstract: Methods and apparatus for desalination of salt water (and purification of polluted water) are disclosed. Saline (or otherwise polluted) water is pumped to a desalination installation and down to the base of a desalination fractionation column, where it is mixed with hydrate-forming gas or liquid to form either positively buoyant (also assisted buoyancy) or negatively buoyant hydrate. The hydrate rises or sinks or is carried into a lower pressure area and dissociates (melts) into the gas and pure water. In preferred embodiments, residual salt water which is heated by heat given off during formation of the hydrate is removed from the system to create a bias towards overall cooling as the hydrate dissociates endothermically at shallower depths, and input water is passed through regions of dissociation in heat-exchanging relationship therewith so as to be cooled sufficiently for hydrate to form at pressure-depth.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: November 5, 2002
    Assignee: Marine Desalination Systems LLC
    Inventor: Michael David Max
  • Patent number: 6401633
    Abstract: An apparatus for treating organic waste material characterized by high ash content is disclosed.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: June 11, 2002
    Assignee: Minergy Corporation
    Inventor: Thomas J. Baudhuin
  • Patent number: 6336344
    Abstract: A cryogenic process for the separation of one light gas component from a heavier gas component in a gas feed stream, by injecting a liquid hydrocarbon additive stream into the top or upper portion of a dephlegmator-heat exchanger, to increase the rectification temperature, or to maintain the temperature and reduce the additive flow rate relative to the respective values required with a conventional, single stage condenser.
    Type: Grant
    Filed: May 26, 2000
    Date of Patent: January 8, 2002
    Assignee: Chart, Inc.
    Inventor: John V. O'Brien
  • Patent number: 6327872
    Abstract: The present invention provides a method and apparatus for producing a pressurized high purity liquid carbon dioxide stream in which a feed stream composed of carbon dioxide vapor is purified within a purifying filter and then condensed within a condenser. The result liquid is then alternately introduced and dispensed from two first and second pressure accumulation chambers. The first and second pressure accumulation chambers are heated by electrical heaters to pressurize the liquid to the required or desired delivery pressure of the pressurized liquid carbon dioxide stream. Such stream is alternately extracted from the first and second pressure accumulation chambers on a continuous basis in which one of the first and second pressure accumulation chambers acts in a dispensing role while the other is being filled. The pressurized liquid carbon dioxide stream can be further filtered within a particulate filter.
    Type: Grant
    Filed: June 27, 2000
    Date of Patent: December 11, 2001
    Assignee: The BOC Group, Inc.
    Inventors: Robert Walter Boyd, Jessi Lynn Pike, David C. Cheng, Kelly Leitch
  • Publication number: 20010004838
    Abstract: A system for producing carbon dioxide wherein carbon dioxide feed fluid is first processed in a cooling section of an integrated heat exchanger before purification in a column, and wherein column bottom fluid operates within one of an evaporating section and desuperheating section of the heat exchanger and refrigerant fluid operates within the other of the evaporating section and desuperheating section of the heat exchanger.
    Type: Application
    Filed: January 9, 2001
    Publication date: June 28, 2001
    Inventors: Kenneth Kai Wong, Dante Patrick Bonaquist, Henry Edward Howard
  • Patent number: 6216611
    Abstract: An apparatus for treating organic waste material characterized by high ash content is disclosed.
    Type: Grant
    Filed: January 21, 2000
    Date of Patent: April 17, 2001
    Assignee: Minergy Corp.
    Inventor: Thomas J. Baudhuin
  • Patent number: 6119606
    Abstract: A system and a process for combusting hydrocarbons to recover energy and the carbon dioxide resulting from the combustion is provided. The process utilizes a two-stage combustion process, each stage utilizing water injection and a recirculation stream to increase the efficiency of combustion to generate larger proportions of carbon dioxide. An energy recovery boiler is used to recover heat energy from the combustion product. Combustion product is then cleaned and the carbon dioxide is separated and condensed into a useable liquid carbon dioxide product.
    Type: Grant
    Filed: February 3, 1999
    Date of Patent: September 19, 2000
    Assignee: M. Ltd.
    Inventor: Steve L. Clark
  • Patent number: 6035662
    Abstract: A process and an apparatus for producing substantially pure carbon dioxide from a carbon dioxide feed containing from about 80% to about 95% volume of carbon dioxide.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: March 14, 2000
    Assignee: Praxair Technology, Inc.
    Inventors: Henry Edward Howard, Claudio Bruno Capurro
  • Patent number: 5983663
    Abstract: A process to bulk separate H.sub.2 S and CO.sub.2 from a sour gas by first cooling the inlet sour gas, passing the cooled sour gas through a separator and removing a liquid acid gas as a bottoms product in a fractionation tower, and then either pumping or free flowing the liquid acid gas into a disposal well. Potential sulphur deposition problems are controlled by recycling liquid acid gas to the plant inlet.
    Type: Grant
    Filed: May 8, 1998
    Date of Patent: November 16, 1999
    Assignee: Kvaerner Process Systems, Inc.
    Inventor: Anthony J Sterner
  • Patent number: 5974829
    Abstract: The method of the invention recovers CO.sub.2 from an inlet cold feed stream containing a low concentration thereof, and includes the following steps. An inlet feed stream is passed through a heat exchanger, against a compressed flow of the inlet feed stream, to cool the compressed flow. The compressed flow is further cooled and compressed to a high pressure, fed to a distillation column and there converted into a vent gas including CO.sub.2 and a high purity bottom liquid CO.sub.2. A first portion of the bottom liquid CO.sub.2 is expanded to achieve a first cooled liquid CO.sub.2 refrigerant flow, which is then vaporized against the vent gas to recover condensed CO.sub.2 therefrom. The condensed CO.sub.2 is then reintroduced into the distillation column. A second portion of the bottom liquid CO.sub.2 is expanded to achieve a second cooled liquid CO.sub.2 refrigerant flow, which is then used to subcool the CO.sub.2 product output.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: November 2, 1999
    Assignee: Praxair Technology, Inc.
    Inventors: Richard A. Novak, Gary Lang, Brad Hagstrom, Enrique Lozano
  • Patent number: 5927103
    Abstract: A system for producing carbon dioxide, particularly from a feed which contains significant levels of light contaminants, wherein light overhead from a distillation column is partially condensed against heat exchange fluid containing both carbon dioxide and light contaminants and the resulting heat exchange fluid passed into the feed for the distillation column.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: July 27, 1999
    Assignee: Praxair Technology, Inc.
    Inventor: Henry Edward Howard
  • Patent number: 5906806
    Abstract: A system and a process for combusting hydrocarbons to recover energy and the carbon dioxide resulting from the combustion is provided. The process utilizes a two-stage combustion process, each stage utilizing water injection and a recirculation stream to increase the efficiency of combustion to generate larger proportions of carbon dioxide. An energy recovery boiler is used to recover heat energy from the combustion product. Combustion product is then cleaned and the carbon dioxide is separated and condensed into a useable liquid carbon dioxide product.
    Type: Grant
    Filed: October 16, 1996
    Date of Patent: May 25, 1999
    Inventor: Steve L. Clark
  • Patent number: 5832746
    Abstract: An ultra-high purity nitrogen trifluoride production method comprises: pressurizing a nitrogen trifluoride feed gas, eliminating moisture and carbon dioxide from the feed gas, and cooling down the same feed gas; causing the cooled feed gas to pass through adsorption columns, and introducing it into a medium-pressure rectification column by way of a reboiler in the medium-pressure rectification column, where it is rectified in the medium-pressure rectification column; introducing the resulting gas obtained by this rectification into a middle stage of a low-pressure rectification column, where it is rectified; and taking out ultra-high purity nitrogen trifluoride obtained by virtue of this rectification from the lower part of the low-pressure rectification column.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: November 10, 1998
    Assignee: Teisan Kabushiki Kaisha
    Inventor: Takashi Nagamura
  • Patent number: 5819555
    Abstract: A process with few parts is provided to remove carbon dioxide from a feed stream. The solid forming property of carbon dioxide and the low vapor phase solubility of carbon dioxide at cold temperatures form the basis for the separation process. The cooled feed stream enters a separation vessel where process means are provided to produce and separate carbon dioxide solids. Carbon dioxide is removed from the vessel as a carbon dioxide rich liquid stream. Purified cold vapor is removed from the separation vessel as a product stream.
    Type: Grant
    Filed: August 19, 1996
    Date of Patent: October 13, 1998
    Inventor: Gerald Engdahl
  • Patent number: 5582029
    Abstract: A cryogenic air separation unit (ASU) provides flows of oxygen and nitrogen. The oxygen is used in a process such as COREX iron making or the partial oxidation of hydrocarbons, or in an oxycoal fuelled blast furnace, producing an off-gas containing useful components (H.sub.2 and CO) and carbon dioxide. The carbon dioxide is removed by pressure swing adsorption using nitrogen from the ASU as a regeneration gas and the purified off-gas becomes a feed gas to a further process such as production of iron by direct reduction of iron ore or the production of a NH.sub.3 making ammonia or is recycled into the first process as a feed gas.
    Type: Grant
    Filed: October 4, 1995
    Date of Patent: December 10, 1996
    Assignee: Air Products and Chemicals, Inc.
    Inventors: James M. Occhialini, Rodney J. Allam, Mohammed A. Kalbassi