Stepped Pressure Reduction Patents (Class 95/100)
  • Patent number: 10799827
    Abstract: The present invention relates to a process cycle that allows for the stable production of mid-range purity oxygen from air, using traditional system designs. Typical cycles have a limited production benefit when generating O2 at lower than 90% purity, however they suffer a production loss at higher purity. The process cycles of the invention are capable of producing significantly more contained O2 at a lower purity. In addition to enhanced production capacity, lower power consumed per mass of product and more stable product purity and flow are realized by the process of the invention compared to traditional alternatives.
    Type: Grant
    Filed: April 9, 2018
    Date of Patent: October 13, 2020
    Assignee: PRAXAIR TECHNOLOGY, INC.
    Inventors: Nicholas R. Stuckert, Yang Luo
  • Patent number: 10710019
    Abstract: A pressure swing adsorption gas production device that enables performing a desorption process in adsorption towers is provided. The device includes an off gas discharge route connected to the adsorption towers, a membrane separation unit with a separation membrane allowing miscellaneous gas in the off gas discharge route to pass faster than purification target gas, an off gas tank, and a pressure boosting unit that raises the pressure of and supplies the off gas to the membrane separation unit. The off gas tank and the pressure boosting unit are upstream of the membrane separation unit. The device includes a recycle gas return route via which some recycle gas is returned to the source gas supply route.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: July 14, 2020
    Assignee: Osaka Gas Co., Ltd.
    Inventors: Hiroshi Tanaka, Kota Yokoyama
  • Patent number: 10647587
    Abstract: Process and plant for the synthesis of ammonia from a hydrocarbon feedstock, comprising: primary reforming with steam and air-fired secondary reforming wherein primary reforming is performed at a temperature and pressure of at least 790° C. and 50 bar, and secondary reforming is carried out substantially in absence of excess air, the so obtained make-up synthesis gas having a H2 to N2 molar ratio in the range 2.5 to 3.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: May 12, 2020
    Assignee: Casale SA
    Inventors: Ermanno Filippi, Raffaele Ostuni
  • Patent number: 10632414
    Abstract: The invention provides a process for providing a hydrogen stream to a process utilizing hydrogen comprising obtaining a gas stream containing hydrogen and compressing the gas stream to a pressure of at least 600 psig, Then the compressed gas stream is sent to a pressure swing adsorption unit containing a plurality of beds with at least 5 pressure equalization steps to produce a hydrogen stream. The hydrogen stream can then be compressed and sent to a process utilizing hydrogen. The compressed gas stream may be chilled before entering the pressure swing adsorption unit.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: April 28, 2020
    Inventors: Bradley P. Russell, David A. Wegerer, Gautam Pandey
  • Patent number: 10611635
    Abstract: A hydrogen gas recovery system according to the present ingestion is configured by a condensation and separation apparatus (A) that condenses and separates chlorosilanes from a hydrogen-containing reaction exhaust gas exhausted from a polycrystalline silicon production step, a compression apparatus (B) that compresses the hydrogen-containing reaction exhaust gas, an absorption apparatus (C) that absorbs and separates hydrogen chloride by contacting the hydrogen-containing reaction exhaust gas with an absorption liquid, a first adsorption apparatus (D) comprising an adsorption column filled with activated carbon for adsorbing and removing methane, hydrogen chloride, and part of the chlorosilanes each contained in the hydrogen-containing reaction exhaust gas, a second adsorption apparatus (E) comprising an adsorption column filled with synthetic zeolite that adsorbs and removes methane contained in the hydrogen-containing reaction exhaust gas, and a gas line (F) that recovers a purified hydrogen gas having a re
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: April 7, 2020
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Masahiko Ishida, Shigeyoshi Netsu, Hiroshi Saito, Shuji Tanaka
  • Patent number: 10525402
    Abstract: A method for producing oxygen by adsorbing a stream of atmospheric air, using four VPSA, one air compressor and two vacuum pumps, each adsorber undergoing a single pressure cycle including the following steps: a) producing a first stream of gas having an oxygen content T1 while loading the adsorber of the stream of atmospheric air upstream; b) producing a second stream of gas including an oxygen content T2<T1: c) producing a third stream of gas including an oxygen content T3<T2<T1 while simultaneously extracting a nitrogen-enriched residual stream; d) eluting the adsorber, from which the three streams of gas produced in steps a), b), and c) are taken with the second stream of gas produced in step b); e) repressurizing the adsorber consecutively with at least two streams, first and second repressurizing streams, with increasing oxygen content.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: January 7, 2020
    Assignee: L'Air Liquide, Société Anonyme pour l'Etrude et l'Exploration des Procédés Georges Claude
    Inventors: Christian Monereau, Guillaume Rodrigues, Louis Toulemonde
  • Patent number: 10391440
    Abstract: A method for producing oxygen by adsorbing a stream of atmospheric air, using a VPSA, including at least one adsorber, each adsorber undergoing a single pressure cycle including the following steps: a) producing a first stream of gas having an oxygen content T1 while loading the adsorber of the stream of atmospheric air upstream; b) producing a second stream of gas including an oxygen content T2<T1: c) producing a third stream of gas including an oxygen content T3<T2<T1 while simultaneously extracting a nitrogen-enriched residual stream; d) eluting the adsorber, from which the three streams of gas produced in steps a), b), and c) are taken with the second stream of gas produced in step b); e) repressurizing the adsorber consecutively with at least two streams, first and second repressurizing streams, with increasing oxygen content.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: August 27, 2019
    Assignee: L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude
    Inventors: Christian Monereau, Maxime Perez, Guillaume Rodrigues, Louis Toulemonde
  • Patent number: 10335570
    Abstract: Disclosed is a method of providing oxygen rich gas. Oxygen is separated from ambient air with an oxygen separator in discrete pulses, one pulse at a time. The start of the pulse is synchronized with the beginning of an inhalation of a person. The oxygen rich gas in each pulse is separated from the ambient air in real time during a nitrogen adsorption step concurrent with each inhalation.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: July 2, 2019
    Assignee: 3B MEDICAL INC.
    Inventors: Nicholas P. Van Brunt, Theodore W. Jagger, Perry B. Lonnes, John A. Kivisto
  • Patent number: 10188982
    Abstract: A method of obtaining helium from a helium-containing feed gas. Helium-containing feed gas is fed to a prepurifying unit that uses a pressure swing adsorption process to remove undesirable components from the helium-containing feed gas and obtain a prepurified feed gas. The prepurified feed gas is fed to a membrane unit connected downstream of the prepurifying unit and that has at least one membrane more readily permeable to helium than to at least one further component present in the prepurified feed gas. A pressurized low-helium retentate stream that has not passed through the membrane is fed to the prepurifying unit. The pressurized low-helium retentate is used to displace helium-rich gas from an adsorber that is to be regenerated into an already regenerated adsorber.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: January 29, 2019
    Assignee: LINDE AKTIENGESELLSCHAFT
    Inventors: Tobias Keller, Christian Voss, Martin Bauer, Frank Jennewein
  • Patent number: 10137401
    Abstract: The invention relates to an oxygen separator for generating a flow of oxygen-enriched gas, said oxygen separator comprising at least two oxygen separation devices arranged to separate oxygen from an oxygen comprising gas, said at least two oxygen separation devices each comprising a first end for receiving the oxygen comprising gas and a second end for delivering an oxygen-enriched gas. The oxygen separator further comprising an equalization duct fluidically coupled to the respective second end of said at least two oxygen separation devices, a first gas sensor is provided in the equalization duct such that the first gas sensor is arranged to monitor at least one component of the oxygen-enriched gas in the equalization duct; and control device arranged to control the oxygen separator based on the monitoring by the first gas sensor.
    Type: Grant
    Filed: December 20, 2014
    Date of Patent: November 27, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Achim Gerhard Rolf Koerber, Rainer Hilbig, Paul Van Der Sluis
  • Patent number: 10052580
    Abstract: Methods for operating an adsorption separation zone are described. A trim bed is used with two adsorption beds in a swing bed arrangement. The trim bed will catch small amounts of treated feed remaining in the adsorption bed during the switch over from the spent adsorption bed to the fresh adsorption bed. In addition, any adsorbed material that desorbs from the spent adsorption bed during the displacement step of regeneration would be adsorbed onto the trim bed.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: August 21, 2018
  • Patent number: 9903619
    Abstract: An adsorptive heat transformation arrangement includes at least two adsorbers which are connected to at least one pump, an evaporator, and a condenser, a heat store comprising a plurality of horizontal loading and unloading devices for simultaneously stratifying and/or withdrawing a heat transfer fluid, and two or more supply lines fluidically coupled to one another and fluidically coupled to at least one adsorption module. Each horizontal loading and unloading device can be supplied with heat transfer fluid via at least one of the two or more supply lines.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: February 27, 2018
    Assignee: KARLSRUHER INSTITUT FUER TECHNOLOGIE
    Inventors: Ferdinand Schmidt, Chirag Joshi, Valentin Schwamberger, Hadi Taheri
  • Patent number: 9737849
    Abstract: A method and apparatus for cleaning and recycling stack gas from coal-fired power plants, from natural or propane burning heating plants, or from cement kilns by using renewable catalysts of zeolite to separate pollutants into recyclable and reusable materials. The method reduces from the stack gas carbon monoxide (CO), carbon dioxide (CO2), nitrogen oxide (NOx), sulfur oxide (SOx) as well as halogens such as chloride and fluorides and trace metals particularly, mercury, lead, and zinc. The method and apparatus also result in production of fertilizer products by purging with gaseous or liquid nitrogen the zeolite beds through which the stack gas flows. The oxygen generated may be recycled to the burners in the plant.
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: August 22, 2017
    Assignee: 3 D Clean Coal Emissions Stack, LLC
    Inventor: James Gary Davidson
  • Patent number: 9446349
    Abstract: Disclosed are an adsorptive permeation hollow fiber membrane formed by uniformly dispersing an adsorbent capable of selectively adsorbing only a specific gas in mixed gas components inside a porous hollow fiber membrane having a sponge structure capable of non-selectively permeating a mixed gas in a powder or crystalline powder form, a method of manufacturing the same, and a gas adsorptive/desorptive separation system utilizing the same.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: September 20, 2016
    Assignee: SEPRATEK Inc.
    Inventors: Choong Kyun Yeom, ByungJae Park
  • Patent number: 9359203
    Abstract: A method for producing nitrogen gas from a raw material gas using a PSA system, the method including using a second adsorbent, which is packed in an auxiliary adsorption tank provided in a line connecting two main adsorption tanks packed with a first adsorbent, to reduce the oxygen concentration within a recovered gas discharged from the main adsorption tank performing a depressurization equalization step, and then introducing the gas into the main adsorption tank performing a pressurization equalization step.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: June 7, 2016
    Assignee: TAIYO NIPPON SANSO CORPORATION
    Inventors: Makiya Kokubu, Hidehisa Sakamoto
  • Patent number: 9132388
    Abstract: A pervaporation element includes a ceramic monolith having an array of parallel channels separated by porous channel walls extending along an axial length of the monolith, and a functional membrane coating a first plurality of the porous channel walls along the axial length of the monolith. The functional membrane functions to separate a fluid into a retentate portion and a permeate portion. The porous channel walls coated by the functional membrane define a plurality of discrete through segments, where each of the discrete through segments are separated from one another by a plurality of uncoated porous channel walls. Fluid entering the discrete through segments is separated into a retentate portion that exits in substantial portion through the discrete through segments and a permeate portion that exits the ceramic monolith radially outward through the uncoated porous channel walls and through a skin of the monolith.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: September 15, 2015
    Assignee: Corning Incorporated
    Inventors: Kenneth Joseph Drury, Darryl L Dunning, Paul Oakley Johnson, Robert Lucchesi, Randall D Partridge, Brandon Thomas Sternquist
  • Patent number: 9034079
    Abstract: A pressure swing adsorption process for removal of CO2 from natural gas streams through a combination of a selective adsorbent material containing an effective amount of a non-adsorbent filler, adsorbent contactor design, and adsorption cycle design. The removal of contaminants from gas streams, preferably natural gas streams, using rapid-cycle swing adsorption processes, such as rapid-cycle pressure swing adsorption (RC-PSA). Separations at high pressure with high product recovery and/or high product purity are provided through a combination of judicious choices of adsorbent material, gas-solid contactor, system configuration, and cycle designs. For example, cycle designs that include steps of purge and staged blow-down as well as the inclusion of a mesopore filler in the adsorbent material significantly improves product (e.g., methane) recovery. An RC-PSA product with less than 10 ppm H2S can be produced from a natural gas feed stream that contains less than 1 mole percent H2S.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: May 19, 2015
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Harry W. Deckman, Robert A. Johnson, Bruce T. Kelley, Peter I. Ravikovitch, Thomas N. Anderson
  • Patent number: 8956441
    Abstract: A method for producing a gas comprising at least 80 vol % carbon monoxide from a Fischer-Tropsch off-gas comprises: (1) feeding Fischer-Tropsch off-gas through a column comprising an adsorbent bed at high pressure and discharging effluent; (2) reducing the pressure in the column and the bed slightly; (3) rinsing the column and the adsorbent bed with methane or a mixture of methane and carbon dioxide; (4) reducing the pressure of the column and adsorbent bed to a low pressure; (5) rinsing the column and adsorbent bed with a mixture of hydrogen and nitrogen; (6) pressurizing the column and adsorbent bed to a high pressure using a mixture of hydrogen and nitrogen. The product stream obtained in step (3) comprising at least 80 vol % carbon monoxide can be sent as feed to a Fischer-Tropsch reaction. In an embodiment, a gas comprising at least 80 vol % hydrogen is also produced.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: February 17, 2015
    Assignee: Shell Oil Company
    Inventors: Justus Theodorus Gerardus Te Braake, Maarten Bracht, Desmond Andrew Bungku, Wouter David Van De Graaf, Xander Linders, Sivakumar Sadasivan Vijayakumari
  • Publication number: 20140373713
    Abstract: A pressure swing adsorption process for an adsorption system having 12 adsorption beds, the process having a cycle with 5 pressure equalization steps. Background is provided for the various pressure swing adsorption cycle steps.
    Type: Application
    Filed: September 11, 2014
    Publication date: December 25, 2014
    Applicant: AIR PRODUCTS AND CHEMICALS, INC.
    Inventors: Edward Landis Weist, JR., Dingjun Wu, Jianguo Xu, Blaine Edward Herb, Bryan Clair Hoke, JR.
  • Patent number: 8784535
    Abstract: The present invention relates to a pressure-temperature swing adsorption process wherein gaseous components that have been adsorbed can be recovered from the adsorbent bed at elevated pressures. In particular, the present invention relates to a pressure-temperature swing adsorption process for the separation of C2+ hydrocarbons (hydrocarbons with at least 2 carbon atoms) from natural gas streams to obtain a high purity methane product stream. In more preferred embodiments of the present processes, the processes may be used to obtain multiple, high purity hydrocarbon product streams from natural gas stream feeds resulting in a chromatographic-like fractionation with recovery of high purity individual gaseous component streams.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: July 22, 2014
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Peter I. Ravikovitch, Robert A. Johnson, Harry W. Deckman, Thomas N. Anderson
  • Patent number: 8784533
    Abstract: A temperature swing adsorption process for the removal of a target species, such as an acid gas, from a gas mixture, such as a natural gas stream. Herein, a novel multi-step temperature swing/pressure swing adsorption is utilized to operate while maintaining very high purity levels of contaminant removal from a product stream. The present process is particularly effective and beneficial in removing contaminants such as CO2 and/or H2S from a natural gas at relatively high adsorption pressures (e.g., at least 500 psig) to create product streams of very high purity (i.e., very low contaminant levels).
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: July 22, 2014
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Daniel P. Leta, Preeti Kamakoti, Harry W. Deckman, Peter I. Ravikovitch, Thomas N. Anderson
  • Patent number: 8784534
    Abstract: A pressure-temperature swing adsorption process for the removal of a target species, such as an acid gas, from a gas mixture, such as a natural gas stream. Herein, a novel multi-step temperature swing/pressure swing adsorption is utilized to operate while maintaining very high purity levels of contaminant removal from a product stream. The present process is particularly effective and beneficial in removing contaminants such as CO2 and/or H2S from a natural gas at high adsorption pressures (e.g., at least 500 psig) to create product streams of very high purity (i.e., very low contaminant levels).
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: July 22, 2014
    Assignee: Exxonmobil Research and Engineering Company
    Inventors: Preeti Kamakoti, Daniel P. Leta, Harry W. Deckman, Peter I. Ravikovitch, Thomas N. Anderson
  • Patent number: 8778051
    Abstract: A process for separating a primary gas component from a feed gas mixture comprising the primary gas component and secondary gas components in four or more adsorption beds. The process comprises subjecting each of the four or more adsorption beds to a repetitive cycle. The repetitive cycle comprises, in sequence, a feed step, a pressure decreasing equalization step, a provide purge step, a blowdown step, a purge step, a pressure increasing equalization step, and a repressurization step. During the pressure decreasing equalization step, rinse gas is co-currently introduced simultaneous with the withdrawal of pressure equalization gas. Rinse gas is formed by compressing blowdown gas and/or purge gas effluent from the adsorption bed undergoing the purge step. The process is particularly suited for separating H2 from a reformate stream.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: July 15, 2014
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Edward Landis Weist, Jr., Jianguo Xu
  • Patent number: 8709136
    Abstract: A process for separating a first gas, for example CO2, from a feed gas mixture comprising the first gas and a second gas, for example H2, in five or more adsorption beds each containing an adsorbent selective for the first gas. The process comprises subjecting each of the adsorption beds to a repetitive cycle comprising, in sequence, (a) a feed step, (b) a rinse step, (c) a pressure decreasing equalization step, (d) a blowdown step, (e) an evacuation step, (f) a pressure increasing equalization step, and (g) a repressurization step. The feed gas mixture may be a reformate from a steam-hydrocarbon reforming process.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: April 29, 2014
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Kuo-Kuang Hsu, Jonathan James Berg, Jianguo Xu, Edward Landis Weist, Jr.
  • Publication number: 20140033919
    Abstract: A pressure swing adsorption process for removal of C02 from natural gas streams through a combination of a selective adsorbent material containing an effective amount of a non-adsorbent filler, adsorbent contactor design, and adsorption cycle design. The removal of contaminants from gas streams, preferably natural gas streams, using rapid-cycle swing adsorption processes, such as rapid-cycle pressure swing adsorption (RC-PSA). Separations at high pressure with high product recovery and/or high product purity are provided through a combination of judicious choices of adsorbent material, gas-solid contactor, system configuration, and cycle designs. For example, cycle designs that include steps of purge and staged blow-down as well as the inclusion of a mesopore filler in the adsorbent material significantly improves product (e.g., methane) recovery. An RC-PSA product with less than 10 ppm H2S can be produced from a natural gas feed stream that contains less than 1 mole percent H2S.
    Type: Application
    Filed: February 27, 2012
    Publication date: February 6, 2014
    Inventors: Harry W. Deckman, Robert A. Johnson, Bruce T. Kelley, Peter I. Ravikovitch, Thomas N. Anderson
  • Publication number: 20130255492
    Abstract: A process for separating a first gas, for example CO2, from a feed gas mixture comprising the first gas and a second gas, for example H2, in five or more adsorption beds each containing an adsorbent selective for the first gas. The process comprises subjecting each of the adsorption beds to a repetitive cycle comprising, in sequence, (a) a feed step, (b) a rinse step, (c) a pressure decreasing equalization step, (d) a blowdown step, (e) an evacuation step, (f) a pressure increasing equalization step, and (g) a repressurization step. The feed gas mixture may be a reformate from a steam-hydrocarbon reforming process.
    Type: Application
    Filed: April 3, 2012
    Publication date: October 3, 2013
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Kuo-Kuang Hsu, Jonathan James Berg, Jianguo Xu, Edward Landis Weist, JR.
  • Patent number: 8545601
    Abstract: A two-stage complete recycle pressure-swing adsorption process for gas separation features that separating more adsorptable component and less adsorptable component from gas mixture, and the product is more adsorptable component or less adsorptable component or both of them. Serially-connected operation of two-stage pressure-swing adsorber is employed. The gas mixture is fed into the first stage pressure-swing adsorption gas separation system, and the more adsorptable component of the gas mixture is absorbed, then is abstracted into product. The semifinished gas mixture from the outlet of the first stage pressure-swing adsorption tower is fed into the second stage pressure-swing adsorption gas separation system. The more adsorptable component of the semifinished gas mixture is absorbed further, and the less adsorptable component is fed into next stage.
    Type: Grant
    Filed: May 9, 2005
    Date of Patent: October 1, 2013
    Inventor: Yuwen Song
  • Publication number: 20130239807
    Abstract: A process for separating a primary gas component from a feed gas mixture comprising the primary gas component and secondary gas components in four or more adsorption beds. The process comprises subjecting each of the four or more adsorption beds to a repetitive cycle. The repetitive cycle comprises, in sequence, a feed step, a pressure decreasing equalization step, a provide purge step, a blowdown step, a purge step, a pressure increasing equalization step, and a repressurization step. During the pressure decreasing equalization step, rinse gas is co-currently introduced simultaneous with the withdrawal of pressure equalization gas. Rinse gas is formed by compressing blowdown gas and/or purge gas effluent from the adsorption bed undergoing the purge step. The process is particularly suited for separating H2 from a reformate stream.
    Type: Application
    Filed: March 15, 2012
    Publication date: September 19, 2013
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Edward Landis Weist, JR., Jianguo Xu
  • Patent number: 8486180
    Abstract: A concentrated carbon dioxide stream is produced during a hydrogen pressure swing adsorption unit cycle by fractionating the carbon dioxide removed from the adsorbent in the adsorption beds during the regeneration of the adsorption beds. Thereby providing a cost efficient process for producing merchant carbon dioxide.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: July 16, 2013
    Assignee: American Air Liquide, Inc.
    Inventor: Yudong Chen
  • Patent number: 8480770
    Abstract: A hydrogen manufacturing system for performing offgas flow control includes: a vaporizer (1) for heating a material mixture containing a hydrocarbon material; a reforming reactor (2) for generating hydrogen-containing reformed gas by reforming reactions of the material; a PSA separator (5) for repeating a cycle of adsorption and desorption, where in the adsorption PSA separation is performed with an adsorption tower loaded with an adsorbent to adsorb unnecessary components in the reformed gas and extract hydrogen-enriched gas out of the tower, and in the desorption the offgas containing the unnecessary components from the adsorbent and remaining hydrogen is discharged from the tower; and a buffer tank (6) for holding the offgas before supplying to the vaporizer. The offgas flow supply from the tank (6) to the vaporizer is changed continuously over time when the cycle time is changed according to load change on the separator (5).
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: July 9, 2013
    Assignee: Sumitomo Seika Chemicals Co., Ltd.
    Inventors: Toshihiko Sumida, Masanori Miyake, Hidenori Minami, Yoshinori Ueda
  • Patent number: 8394171
    Abstract: Embodiments of methods for controlling impurity buildup on adsorbent for a pressure swing adsorption (PSA) process are provided. The method comprises the steps of operating the PSA process including performing (a) a first depressurizing equalization step, and (b) a providing purge step. Impurities are sensed in an effluent from the PSA process. If the impurities sensed in the effluent have reached a predetermined upper impurity level, then the PSA process is operated including performing (b) and not (a).
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: March 12, 2013
    Assignee: UOP LLC
    Inventors: Wim Frans Elseviers, Stephan Laux
  • Patent number: 8298305
    Abstract: A hydrogen manufacturing system for performing offgas flow control includes: a vaporizer (1) for heating a material mixture containing a hydrocarbon material; a reforming reactor (2) for generating hydrogen-containing reformed gas by reforming reactions of the material; a PSA separator (5) for repeating a cycle of adsorption and desorption, where in the adsorption PSA separation is performed with an adsorption tower loaded with an adsorbent to adsorb unnecessary components in the reformed gas and extract hydrogen-enriched gas out of the tower, and in the desorption the offgas containing the unnecessary components from the adsorbent and remaining hydrogen is discharged from the tower; and a buffer tank (6) for holding the offgas before supplying to the vaporizer. The offgas flow supply from the tank (6) to the vaporizer is changed continuously over time when the cycle time is changed according to load change on the separator (5).
    Type: Grant
    Filed: May 7, 2007
    Date of Patent: October 30, 2012
    Assignee: Sumitomo Seika Chemicals Co., Ltd.
    Inventors: Toshihiko Sumida, Masanori Miyake, Hidenori Minami, Yoshinori Ueda
  • Publication number: 20120174777
    Abstract: The present invention relates to large scale pressure swing adsorption systems (i.e., ranging from twelve to sixteen beds) utilizing new and advanced cycles to obtain enhanced hydrogen recovery from a hydrogen containing feed gas (i.e., synthesis gas).
    Type: Application
    Filed: January 11, 2011
    Publication date: July 12, 2012
    Inventors: Mohamed S. A. Baksh, Marian Simo
  • Patent number: 8038771
    Abstract: Pressure swing adsorption (PSA) assemblies with purge control systems, and hydrogen-generation assemblies and/or fuel cell systems containing the same. The PSA assemblies are operated according to a PSA cycle to produce a product hydrogen stream and a byproduct stream from a mixed gas stream. The byproduct stream may be delivered as a fuel stream to a heating assembly, which may heat the hydrogen-producing region that produces the mixed gas stream. The PSA assemblies may be adapted to regulate the flow of purge gas utilized therein, such as according to a predetermined, non-constant profile. In some embodiments, the flow of purge gas is regulated to maintain the flow rate and/or fuel value of the byproduct stream at or within a determined range of a threshold value, and/or to regulate the flow of purge gas to limit the concentration of carbon monoxide in a heated exhaust stream produced from the byproduct stream.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: October 18, 2011
    Assignee: Idatech, LLC
    Inventor: Travis A. Bizjak
  • Patent number: 8020553
    Abstract: An oxygen concentrator comprises an oxygen reservoir and adsorbent columns that each have an inlet, an outlet, and a bed of adsorbent material. The concentrator also comprises an air inlet, an exhaust outlet, and a vacuum pump for pumping nitrogen rich gas from one of the column inlets to the exhaust outlet. A product control pump pumps oxygen rich gas from one of the column outlets to the oxygen reservoir. A control valve controls flow in and out of the columns by selectively connecting the air inlet to one column inlet, connecting the vacuum pump to another column inlet, and connecting the product control pump to a column outlet. A motor drives the vacuum pump and control valve to produce vacuum swing adsorption (VSA) cycles in which oxygen-rich product gas is separated and accumulated in the reservoir.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: September 20, 2011
    Assignee: Vbox, Incorporated
    Inventors: Theodore W. Jagger, Nicholas P. Van Brunt, John A. Kivisto, Perry B. Lonnes
  • Patent number: 7954490
    Abstract: Concentrated oxygen product gas is produced and delivered to a patient. Product gas is produced by (a) introducing ambient air into a first end of a column containing an adsorbent material that preferentially adsorbs nitrogen and removes oxygen-rich product gas out a second end of the column; (b) evacuating the column through the first end to remove adsorbed gas from the column; (c) repressurizing the column by introducing ambient air into the first end of the column until the column is near 1.0 atmosphere; and (d) repeating steps (a)-(c). Product gas is delivered as needed to the patient.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: June 7, 2011
    Assignee: Vbox, Incorporated
    Inventors: Theodore W. Jagger, Nicholas P. Van Brunt, John A. Kivisto, Perry B. Lonnes
  • Publication number: 20110023712
    Abstract: Pressure swing adsorption system comprising two or more vessels, each having a feed end, a product end, and adsorbent material adapted to adsorb one or more components from a multi-component feed gas mixture; piping adapted to (1) introduce the feed gas mixture into the feed ends, withdraw a product gas from the product ends, and withdraw a waste gas from the feed ends of the vessels, and (2) place the product ends of any pair of vessels in flow communication; a feed pipe adapted to supply the feed gas mixture to the system; a product pipe adapted to withdraw the product gas from the system; and a waste gas pipe adapted to withdraw the waste gas from the system. An indexed rotatable multi-port valve is adapted to place the product end of each vessel in sequential flow communication with the product end of each of the other vessels.
    Type: Application
    Filed: September 24, 2010
    Publication date: February 3, 2011
    Applicant: AIR PRODUCTS AND CHEMICALS, INC.
    Inventors: David Lester Rarig, Roger Dean Whitley, Matthew James LaBuda
  • Patent number: 7833311
    Abstract: Pressure swing adsorption (PSA) assemblies with temperature-based breakthrough detection systems, as well as to hydrogen-generation assemblies and/or fuel cell systems containing the same, and to methods of operating the same. The detection systems are adapted to detect a measured temperature associated with adsorbent in an adsorbent bed of a PSA assembly and to control the operation of at least the PSA assembly responsive at least in part thereto, such as responsive to the relationship between the measured temperature and at least one reference temperature. The reference temperature may include a stored value, a previously measured temperature and/or a temperature measured elsewhere in the PSA assembly. In some embodiments, the reference temperature is associated with adsorbent downstream from the adsorbent from which the measured temperature is detected.
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: November 16, 2010
    Assignee: Idatech, LLC
    Inventor: James A. Givens
  • Patent number: 7824472
    Abstract: In order to provide a new PSA method which can concentrate simultaneously a strong adsorbate such as xenon and a weak adsorbate such as nitrogen in a high concentration with a high recovery percentage when highly valuable gas such as xenon and krypton contained in the exhaust gas from a semiconductor manufacturing equipment, etc.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: November 2, 2010
    Assignee: Taiyo Nippon Sanso Corporation
    Inventor: Tatsushi Urakami
  • Patent number: 7819948
    Abstract: A rotary valve is disclosed having a rotor and stator that utilizes at least one compression spring to provide contact between the rotor and stator. The spring(s) is configured to oppose the pressure forces that urge the rotors and stators apart and reduce the amount of torque necessary to turn the rotors in the valve while preventing leakage from between the rotor and stator. The spring(s) may be positioned within the valve by a spring locating features.
    Type: Grant
    Filed: October 29, 2007
    Date of Patent: October 26, 2010
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Glenn Paul Wagner
  • Patent number: 7766010
    Abstract: A method of providing concentrated oxygen product gas to a patient. The method comprises producing product gas by a vacuum swing adsorption (VSA) process with an oxygen concentrator comprising a plurality of separation columns connected to a vacuum source driven by a motor. Separated product gas is then pumped to a product reservoir. The pressure of the reservoir is monitored and used to adjust the speed of the motor based on the reservoir pressure. The separated gas is then delivered to the patient.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: August 3, 2010
    Assignee: VBOX, Incorporated
    Inventors: Theodore W. Jagger, Nicholas P. Van Brunt, John A. Kivisto, Perry B. Lonnes
  • Patent number: 7763100
    Abstract: Novel polybed VPSA process and system to achieve enhanced O2 recovery are disclosed. The VPSA process comprises using three or more adsorber beds; providing a continuous feed supply gas using a single feed blower to one bed, wherein at any instant during the process, two beds are in an evacuation step and only one bed is in a feed mode; and purging the adsorber beds using two purge gases of different purity. The VPSA cycle may further comprise utilizing a storage device (e.g., a packed or empty equalization tank) to capture void gases during co-current depressurization step of the VPSA cycle, which is used at a later stage for purging and repressurization of the bed. In addition, the VPSA process employs a single feed compressor and two vacuum pumps at 100% utilization. Furthermore, the use of the storage device minimizes the use of product quality gas for purging. About 10-20% improvement in O2 productivity is realized in the new VPSA process.
    Type: Grant
    Filed: July 6, 2006
    Date of Patent: July 27, 2010
    Assignee: Praxair Technology, Inc.
    Inventors: Mohamed Safdar Allie Baksh, Andrew Chester Rosinski
  • Patent number: 7763098
    Abstract: Embodiments of a rapid cycle PSA apparatus are described that are useful for producing a hydrogen enriched product gas comprising not more than about 50 ppm carbon monoxide by volume and with a hydrogen gas recovery of at least about 70% by adsorptive separation from a syngas feed gas mixture comprising at least about 50 percent hydrogen and at least about 1 percent carbon monoxide by volume. One disclosed embodiment of a rapid cycle PSA apparatus comprised at least 3 adsorber elements each having at least one thin adsorbent sheet material which comprises at least one adsorbent material therein, and a bed size factor less than about 4.0 seconds. Embodiments of a rapid cycle PSA process also are described that utilize disclosed embodiments of the rapid-cycle PSA device.
    Type: Grant
    Filed: November 14, 2006
    Date of Patent: July 27, 2010
    Assignee: Xebec Adsorption Inc.
    Inventors: Soheil Alizadeh-Khiavi, James A. Sawada, Andrea C. Gibbs, Jeffrey Alvaji
  • Patent number: 7740688
    Abstract: The present invention generally relates to vacuum pressure swing adsorption (VPSA) processes and apparatus to recover carbon dioxide having a purity of approximately ?90 mole % from streams containing at least carbon dioxide and hydrogen (e.g., syngas). The feed to the CO2 VPSA unit can be at super ambient pressure. The CO2 VPSA unit produces three streams, a H2-enriched stream, a H2-depleted stream and a CO2 product stream. When the CO2 VPSA unit is installed between an SMR/shift reactor and a H2 PSA unit, hydrogen recovery is expected to be increased by extracting CO2, thereby increasing hydrogen partial pressure in the H2 PSA feed. The stream from the CO2 VPSA unit, normally used as fuel, is recycled as feed to increase CO2 recovery. The recovered CO2 can be further upgraded, sequestered or used in applications such as enhanced oil recovery (EOR).
    Type: Grant
    Filed: September 26, 2006
    Date of Patent: June 22, 2010
    Assignee: Praxair Technology, Inc.
    Inventor: Ravi Kumar
  • Publication number: 20100089233
    Abstract: The present invention relates to a method of producing hydrogen of very high purity from a feed predominantly containing said hydrogen and a minor part of impurities mainly consisting of carbon dioxide, carbon monoxide, methane and heavier hydrocarbons. The purification method by hydrogen adsorption using a desorption stage at a lower pressure than the pressure of the feed, such as a PSA method for example, allows to produce the desorption stream and notably to recover the carbon dioxide under pressure and high-purity hydrogen, with a high yield. These performances are obtained by combining the successive stages of the method according to the invention with the use of a new family of adsorbent whose dynamic capacity at a high desorption pressure is greater than that of conventional adsorbents.
    Type: Application
    Filed: November 30, 2007
    Publication date: April 15, 2010
    Applicant: IFP
    Inventors: Gerhard Pirngruber, Elsa Jolimaitre, Luc Wolff, Damien Leinekugel Le Cocq
  • Patent number: 7694674
    Abstract: An electronic controller (16) controls the operation of an electrochemical oxygen generating system (14) producing a desired gas. The product gas is fed to a storage unit (12) or a regulator (28) and pulsing valve (28) controlling the gas flow to a user. A two-stage system (180) combines a low pressure 100 and a high pressure (150) gas generating subsystems. The low pressure subsystem (100) uses IMAT's (106) to pump oxygen from ambient air to generate a low-pressure. The high pressure subsystem (150) uses IMAT's (160) to pump oxygen to high-pressure oxygen storage devices (194).
    Type: Grant
    Filed: June 12, 2005
    Date of Patent: April 13, 2010
    Assignee: Carleton Life Support Systems, Inc.
    Inventors: Victor P. Crome, Gary N. Byrd, Russell F. Hart, Scott R. Sehlin, Tuan Q. Cao, Courtney Joseph Monzyk, Timothy P. Raleigh, Lyle J. Berkenbosch, Craig L. Schledewitz
  • Patent number: 7695545
    Abstract: A process for selectively separating hydrogen from at least one more strongly adsorbable component in a plurality of adsorption beds to produce a hydrogen-rich product gas from a low hydrogen concentration feed with a high recovery rate. Each of the plurality of adsorption beds subjected to a repetitive cycle. The process comprises an adsorption step for producing the hydrogen-rich product from a feed gas mixture comprising 5% to 50% hydrogen, at least two pressure equalization by void space gas withdrawal steps, a provide purge step resulting in a first pressure decrease, a blowdown step resulting in a second pressure decrease, a purge step, at least two pressure equalization by void space gas introduction steps, and a repressurization step. The second pressure decrease is at least 2 times greater than the first pressure decrease.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: April 13, 2010
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Timothy Christopher Golden, Edward Landis Weist, Jr., Jeffrey Raymond Hufton, Paul Anthony Novosat
  • Patent number: 7651549
    Abstract: Process step in a pressure swing adsorption process using multiple parallel adsorbent beds operating in cyclic process steps to recover a less strongly adsorbable component from a feed gas mixture containing at least one less strongly adsorbable component and at least one more strongly adsorbable component, wherein each adsorbent bed has a feed end and a product end, wherein each bed is subjected to at least a feed/product step, one or more depressurization steps, a purge step in which a purge gas enriched in the less strongly adsorbable component is introduced into the product end of the bed and a purge effluent gas is withdrawn from the feed end of the bed, and one or more repressurization steps. The process step comprises introducing at least a portion of the purge effluent gas from a first bed into the feed end of a second adsorbent bed at any time other than during the feed/product step in the second adsorbent bed.
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: January 26, 2010
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Roger Dean Whitley
  • Publication number: 20090320679
    Abstract: The present invention relates generally to processes and systems for recovering helium from low helium-containing feed gases (i.e., containing less than about 10 volume % helium and more typically, less than about 5 % helium by volume). The present invention more particularly relates to processes and systems for recovering helium from low helium-containing feed gases using temperature swing adsorption (TSA) systems and multiple (e.g. two) stage vacuum pressure swing adsorption (VPSA) systems. In preferred embodiments of the invention, the first stage VPSA system is configured to provide regeneration gas for the TSA system, and/or the VPSA second stage tail gas is recycled to the first stage VPSA system.
    Type: Application
    Filed: June 27, 2008
    Publication date: December 31, 2009
    Applicant: Praxair Technology, Inc.
    Inventor: Mohamed Safdar Allie Baksh
  • Publication number: 20090293717
    Abstract: The present invention provides a low-cost ozone production method and apparatus for carrying out ozone/oxygen separation using an ozone adsorbent, that re-uses the recovered oxygen as a feed for ozone production, and that desorbs and recovers the adsorbed ozone using dry air. In the method and apparatus, a gas containing an ozone and oxygen two-component gas supplied from an ozone generator is pressurized, introduced into an ozone adsorbent-packed adsorption column, and brought into contact with the adsorbent to adsorb the ozone to the adsorbent. Using dry air as a counterflow purge gas for the adsorbed ozone, the ozone is desorbed from the ozone adsorbent-packed adsorption column loaded with adsorbed ozone by depressurizing the adsorption column or air is introduced as a purge gas from the rear of the column into the adsorbent bed, whereby an ozone and air two-component gas is recovered.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 3, 2009
    Inventors: Jun IZUMI, Hong X. WANG