And Regeneration Of Any Solid Sorbent Patents (Class 95/119)
  • Patent number: 10245554
    Abstract: The invention relates to a gas purifier that removes moisture and oxygen from inert gases and reducing gases, for example, at sub-atmospheric pressures. The purifier can remove part per million levels of moisture in a gas stream to less than 100 parts per trillion by volume, and has a low pressure drop and a sharp breakthrough curve.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: April 2, 2019
    Assignee: Entegris, Inc.
    Inventors: Abneesh Srivastava, Thomas Richard Gaffney, Joshua T. Cook, Peter K. Shorgen, Daimhin Paul Murphy, Stenio da Costa Pereira
  • Patent number: 9339759
    Abstract: A gas separation system, comprising a buffer tank that stores therein a source gas and supplies the source gas; a pressurizing unit configured to receive the source gas from the buffer tank and pressurize the received source gas; a first refining unit configured to produce a first refined gas by refining the source gas pressurized by the pressurizing unit, and discharge a first waste gas; a second refining unit configured to produce a second refined gas by refining the first refined gas, and discharge a second waste gas; a third refining unit configured to produce a third refined gas by refining the first waste gas; a first collection line configured to guide the second waste gas to the buffer tank, and including a second flow rate control valve for controlling a flow rate of the second waste gas.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: May 17, 2016
    Assignee: GS ENGINEERING & CONSTRUCTION CORP.
    Inventors: Wangyun Won, Daeho Ko, Kyungtae Park
  • Publication number: 20140230650
    Abstract: A method for retrofitting a system for removing mercury and water from a gas stream is disclosed. A system is provided including a first water removal unit and a second mercury removal unit in fluid communication with the first water removal unit. The first water removal unit has a fixed capacity or reservoir for containing mole sieves for removing water from a gas stream. The second mercury removal unit has a fixed capacity or reservoir for containing mole sieves for removing mercury from the gas stream. The second mercury removal unit is filled with mole sieves adapted for removing mercury from a gas stream containing mercury. The first water removal unit is retrofit by replacing a first portion of mole sieves adapted for removing water from the gas stream with a second portion of mole sieves adapted for removing mercury.
    Type: Application
    Filed: February 20, 2014
    Publication date: August 21, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventor: Feng-Ran Sheu
  • Patent number: 8702845
    Abstract: The invention pertains to a system for purification of a carbon dioxide rich flue gas generated in a boiler combusting a fuel in the presence of a gas containing oxygen, and being contaminated by NOx gases, wherein the system comprising one or more gas drier(s) comprising desiccants for removal of at least a portion of water content of the further compressed carbon dioxide rich flue gas; and a closed loop connected to the drier(s) for regeneration of desiccants of the drier(s) wherein the NOx gases are removed substantially separately from the water vapor. The invention pertains also to a method for removing the NOx gases substantially separately from the water vapor.
    Type: Grant
    Filed: September 6, 2013
    Date of Patent: April 22, 2014
    Assignee: ALSTOM Technology Ltd
    Inventor: Olaf Stallmann
  • Patent number: 8409331
    Abstract: The invention relates to auxiliary systems ensuring functioning of alkaline fuel cell (AFC), in particular to a method and device for sorptive purification of air used in an AFC of carbon dioxide. In accordance with the invention, in the method for purifying air for a fuel cell, the starting air is passed through an adsorber with an adsorbent of carbon dioxide, then the adsorbent is regenerated. After utilization the adsorbent comprising hydrated oxides of transition metals is regenerated at a temperature of 60-120° C. by the air spent in the fuel cell.
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: April 2, 2013
    Assignee: Obschestvo S Ogranichennoi Otvetstvennostiyu “Intensis”
    Inventors: Ziya Ramizovich Karichev, Dmitry Alexandrovich Blatov, Stanislav Iliich Simanenkov, Valentina Nikolaevna Shubina
  • Patent number: 8268030
    Abstract: The invention provides wind energy use. One application provides wind energy use for water harvesting from natural humid air. The method is based on changing thermodynamic state parameters of ambient wind air portions passed through a device comprising convergent-divergent and wing-like components. Those components transform the ambient wind portions into fast and cooled outflowing air portions. A decrease in static pressure and temperature triggers condensation of water-vapor into water-aerosols. Another application of the method provides an effective mechanism for harvesting electrical energy from naturally warm air using renewable wind energy, including the wind inertia, internal heat, and potential energy stored in the air mass in the Earth's gravitational field. The electrical energy harvesting mechanism is also applicable to use of natural renewable energy of streaming water.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: September 18, 2012
    Inventor: Yuri Abramov
  • Patent number: 8221514
    Abstract: The invention provides an ecologically clean method and apparatus for water harvesting from air. The method is based on changing of thermodynamic state properties of air wind getting a rotation and passing through convergent-divergent nozzles. The apparatus is a water condensation engine exposed to humid wind. The constructive solution has no moving solid parts, and the incoming wind is an inherent moving component of the engine. It comprises a cascade of sequentially arranged horn-tubes and a set of stationary wing-like details. Those horn-tubes transform the wind into a fast and cooled out-flowing air flux coming-and-hitting upon the set of wing-like details, where the air portions are accelerated and eddying. The inner static pressure and temperature decrease in the air portions. The decrease in static pressure and temperature triggers off condensation of water-vapors into water-aerosols.
    Type: Grant
    Filed: August 11, 2010
    Date of Patent: July 17, 2012
    Assignee: Yuri Abramov
    Inventor: Yuri Abramov
  • Patent number: 8211211
    Abstract: Methane product gas is produced from landfill gas and gob gas either by a three-stage process of PSA-TSA-PSA or PSA-PSA-PSA, or a two-stage process of PSA-PSA.
    Type: Grant
    Filed: September 25, 2007
    Date of Patent: July 3, 2012
    Assignee: Kent S. Knaebel & Associates, Inc.
    Inventor: Kent S. Knaebel
  • Patent number: 7922790
    Abstract: Compressor device having a compressor (2) with an inlet (3) and an outlet (4); a compressed air line (5) which connects the outlet (4) of the compressor (2) to a user network (6); a drier (7) which is incorporated in the compressed air line (5) and which includes at least two air receivers (13-16) which are each provided with an inlet (14) and an outlet (15) and which are filled with desiccant or drying agent, which air receivers (13-16) work alternately, such that while one air receiver (13) is drying the compressed gas, the other air receiver (16) is regenerated; and a blow-off device (28) for blowing off at least a part of the gas compressed by the compressor when the compressor (2) works in no-load or in partial load, characterized in that mechanisms are provided which make it possible to guide the part of the compressed gas which is blown off via the blow-off device (28) through the regenerating air receiver (13).
    Type: Grant
    Filed: July 20, 2005
    Date of Patent: April 12, 2011
    Assignee: Atlas Copco Airpower Naamloze Vennootschap
    Inventor: Danny Etienne Andrée Vertriest
  • Publication number: 20100319536
    Abstract: This invention relates in part to a process for producing high purity acetylene by withdrawing a crude acetylene stream from a storage source, and passing said stream through an adsorbent bed that contains layered adsorption media to selectively remove moisture, solvent and carbon dioxide from the stream, thereby producing the high purity acetylene. The adsorption media is regenerated in-situ. The high purity acetylene product is useful as a source material for depositing carbon and carbon-containing films in semiconductor applications.
    Type: Application
    Filed: June 23, 2009
    Publication date: December 23, 2010
    Inventors: Xuemei Song, Lloyd Anthony Brown, Thomas Thompson
  • Patent number: 7789942
    Abstract: Method for drying gas coming from a compressor (2), which is directed through a drier (5) of the type which consists of an air receiver (6) and a drying element (9) in the form of a rotor in which has been provided an adsorption and/or absorption medium (10) which is alternately guided through a drying zone (7) and a regeneration zone (8) of the air receiver (6), whereby during periods of standstill or of idle running of the compressor (2) a gas flow is guided counterflow through the adsorption and/or absorption medium (10) in the drying zone (7), i.e. in a flow direction (P) from the outlet (22) to the inlet (15) of the drying zone (7).
    Type: Grant
    Filed: January 4, 2007
    Date of Patent: September 7, 2010
    Assignee: ATLAS COPCO AIRPOWER, naamloze vennootschap
    Inventors: Bart Etienne Agnes Vanderstraeten, Reinoud Luk Herwig Neefs
  • Publication number: 20100212493
    Abstract: The present application is directed to a method and system for preparing gaseous utility streams from gaseous process streams, nitrogen process streams, and other types of streams. The methods and systems may include at least one swing adsorption process including pressure swing adsorption, temperature swing adsorption, and rapid-cycle adsorption processes to treat gaseous streams for use in dry gas seals of rotating equipment such as compressors, turbines and pumps and for other utilities. The systems and processes of the present disclosure are further applicable to high pressure gaseous streams, for example, up to about 600 bar.
    Type: Application
    Filed: October 14, 2008
    Publication date: August 26, 2010
    Inventors: Peter C. Rasmussen, Paul L. Tanaka, Bruce T. Kelley, Stanley O. Uptigrove, Harry W. Deckman
  • Patent number: 7763174
    Abstract: The present invention pertains to a reverse-flow reactor comprising at least one catalyst bed which is preceded and followed by at least one bed containing selectively adsorbing material, and its application for in a process for the removal of contaminants from a process stream.
    Type: Grant
    Filed: October 24, 2005
    Date of Patent: July 27, 2010
    Assignee: Shell Oil Company
    Inventors: Alouisius Nicolaas Renée Bos, Girish Rajkumar Kabra, Jean-Paul Lange
  • Patent number: 7691183
    Abstract: Method for drying the compressed gas of a compressor device (1) having at least two pressure stages (4-5), whereby a dryer (3) is used with at least two pressure vessels (9-12) which are filled with a desiccant and which work alternately, such that when one pressure vessel (12) is in action to dry the compressed gas, the other pressure vessel (9) is being regenerated, whereby, in order to regenerate the other pressure vessel (9), at least a part of this compressed gas is guided through the regenerating pressure vessel (9), and at least at the end of the regeneration cycle, this part of the compressed gas, after its passage through the regenerating pressure vessel, is guided to the pressure pipe (6) between two pressure stages (4-5).
    Type: Grant
    Filed: October 20, 2005
    Date of Patent: April 6, 2010
    Assignee: Atlas Copco Airpower Naamloze Vennootschap
    Inventor: Danny Etienne Andrée Vertriest
  • Patent number: 7527670
    Abstract: This invention comprises an adsorption process for the removal of at least N2O from a feed gas stream that also contains nitrogen and possibly CO2 and water. In the process the feed stream is passed over adsorbents to remove impurities such as CO2 and water, then over an additional adsorbent having a high N2O/N2 separation factor. In a preferred mode the invention is an air prepurification process for the removal of impurities from air prior to cryogenic separation of air. An apparatus for operating the process is also disclosed.
    Type: Grant
    Filed: December 19, 2002
    Date of Patent: May 5, 2009
    Assignee: Praxair Technology, Inc.
    Inventors: Mark William Ackley, Himanshu Saxena, Gregory William Henzler, Jeffert John Nowobilski
  • Patent number: 7520916
    Abstract: A method of operating a fuel cell system includes providing a fuel inlet stream into a fuel cell stack, operating the fuel cell stack to generate electricity and a hydrogen containing fuel exhaust stream, separating at least a portion of hydrogen contained in the fuel exhaust stream using partial pressure swing adsorption, and providing the hydrogen separated from the fuel exhaust stream to a hydrogen storage vessel or to a hydrogen using device.
    Type: Grant
    Filed: July 25, 2005
    Date of Patent: April 21, 2009
    Assignee: Bloom Energy Corporation
    Inventors: James F. McElroy, John E. Finn, M. Douglas LeVan, Swaminathan Venkataraman, Fred Mitlitsky
  • Publication number: 20090007784
    Abstract: Method for drying gas coming from a compressor (2), which is directed through a drier (5) of the type which consists of an air receiver (6) and a drying element (9) in the form of a rotor in which has been provided an adsorption and/or absorption medium (10) which is alternately guided through a drying zone (7) and a regeneration zone (8) of the air receiver (6), whereby during periods of standstill or of idle running of the compressor (2) a gas flow is guided counterflow through the adsorption and/or absorption medium (10) in the drying zone (7), i.e. in a flow direction (P) from the outlet (22) to the inlet (15) of the drying zone (7).
    Type: Application
    Filed: January 4, 2007
    Publication date: January 8, 2009
    Inventors: Bart Etienne Agnes Vanderstraeten, Reinoud Luk Neefs
  • Publication number: 20080307965
    Abstract: An air dryer, used in a compressed air system, includes an oil coalescing element for agglomerating oil in compressed air passing through the oil coalescing element in a first direction during a charging cycle and passing through the oil coalescing element in a second direction during a purging cycle. A drying material, which is downstream of the oil coalescing element during the charging cycle and upstream of the oil coalescing element during the purging cycle, reduces moisture in the compressed air during the charging cycle.
    Type: Application
    Filed: June 15, 2007
    Publication date: December 18, 2008
    Applicant: BENDIX COMMERCIAL VEHICLE SYSTEMS LLC
    Inventors: Fred W. Hoffman, Leonard A. Quinn, William P. Fornof
  • Patent number: 7166149
    Abstract: Using a high pressure rotary adsorbent wheel, a high value compressed gas feed can be purified by concentrating the impurity such as water, condensing it out, before final purification. Instead of exhausting gas from the system, the effluent can be put back into the feed at a point prior to condensation of the high value gas feed, and therefore the entire feed is purified without any high value gas feed going into a waste stream.
    Type: Grant
    Filed: January 12, 2004
    Date of Patent: January 23, 2007
    Assignee: UOP LLC
    Inventors: Stephen R. Dunne, Peter K. Coughlin, Rustam H. Sethna
  • Patent number: 7011693
    Abstract: A PSA unit for purifying hydrogen in a fuel processor system. The PSA unit employs rotary valves that cycle the pressurization of vessels, including an adsorbent, between a high pressure state and a low pressure state. The purified hydrogen is released from the vessels through a purified gas output port when the vessels are in the high pressure state and the impurities are released through an exhaust port when the vessels are in the low pressure state. The PSA unit also employs a mass flow control device and a pressure sensor in the purified gas output port. A controller receives a pressure signal from the pressure sensor, and controls the flow through the mass flow control device and the speed of the rotary valves so that the proper pressure is maintained at the hydrogen output port.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: March 14, 2006
    Assignee: General Motors Corporation
    Inventors: Kiran Mallavarapu, John B Ruhl, Craig S. Gittleman
  • Patent number: 6916359
    Abstract: Methods of providing ozone at a selected pressure above atmospheric pressure include supplying a purge gas supply (22) pressurized above the selected pressure to at least one ozone adsorption apparatus (12); desorbing ozone from the ozone adsorption apparatus (12) with the pressurized purge gas supply (22); and delivering a mixture of ozone and the purge gas supply (24) at the selected pressure without further compression.
    Type: Grant
    Filed: April 21, 2003
    Date of Patent: July 12, 2005
    Assignee: The BOC Group, Inc.
    Inventor: Ravi Jain
  • Patent number: 6849106
    Abstract: Conducting a PSA process for the purification of gaseous hydrogen contaminated at least with CO and N2 of the H1 where the gas stream to be purified is passed through an adsorption region comprising at least one adsorbent based on zeolite 5A and one adsorbent based on zeolite X exchanged with calcium.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: February 1, 2005
    Assignee: CECA S.A.
    Inventor: Remi Le Bec
  • Patent number: 6767386
    Abstract: CMS adsorbents having suitable indexes are used to improve greatly the performance of nitrogen-producing apparatuses where nitrogen is obtained from the air with a PSA method, so as to improve the efficiency of nitrogen production. A nitrogen PSA apparatus is formed with two adsorbing columns where an adsorption step and a regeneration step are performed alternatively and periodically. The adsorption step is for adsorbing oxygen and conducting nitrogen to a product tank with the supply of compressed air from an air compressor, and the regeneration step for releasing the adsorbed gas after the adsorption step. The adsorbing columns are filled with a carbon molecular sieve (CMS) that selectively adsorbs oxygen as an adsorbent. The CMS adsorbs an oxygen/nitrogen amount of 50% of the saturated adsorption amount with a period TO/TN starting from oxygen/nitrogen supply, wherein TO is 5˜10 seconds and TN is larger than TO by more than 41 times.
    Type: Grant
    Filed: August 14, 2002
    Date of Patent: July 27, 2004
    Assignee: Nippon Sanso Corporation
    Inventors: Masato Kawai, Akihiro Nakamura, Masayoshi Hayashida, Yoshinori Watanabe, Shinichi Marumo
  • Patent number: 6752851
    Abstract: The gas separation and purification process can recover efficiently a valuable gas such as krypton and xenon to be used as an atmospheric gas in a semiconductor manufacturing equipment etc. by means of PSA process. In the process for separating a valuable gas in the form of purified product from a mixed gas, used as a raw gas, containing the valuable gas by means of pressure swing adsorption process, the valuable gas is separated and purified by using as the pressure swing adsorption process a combination of equilibrium pressure swing adsorption process for separating gas components based on the difference in equilibrium adsorption and rate-dependent pressure swing adsorption process for separating the gas components based on the difference in adsorption rates.
    Type: Grant
    Filed: June 19, 2002
    Date of Patent: June 22, 2004
    Assignee: Nippon Sanso Corporation
    Inventors: Masato Kawai, Akihiro Nakamura, Tooru Nagasaka, Shigeru Hayashida
  • Patent number: 6729039
    Abstract: A method and an apparatus for controlling airflow in a desiccant drying system having two desiccant beds (10, 12). A first diverter valve (14) communicates with each of the desiccant beds, a regeneration air inlet (22), and a press air outlet (20). A second diverter valve (16) communicates with each of the desiccant beds, a process air inlet (18), and a regeneration air outlet (28). First and second regeneration air control valves (24, 30) are also provided which during a cooling phase of the regeneration cycle admit a cooling bleed stream of process air to the desiccant bed being regenerated and then convey the cooling air bleed stream from the desiccant bed and through a heat exchanger (42) back to the process air inlet.
    Type: Grant
    Filed: July 21, 2003
    Date of Patent: May 4, 2004
    Assignee: Universal Dynamics, Inc.
    Inventor: Robert R. Crawford
  • Patent number: 6616732
    Abstract: The present invention relates to a novel family of zeolite adsorbents comprising a mixture of zeolite X and zeolite LSX, these adsorbents being predominantly exchanged with sodium or with strontium. These adsorbents are particularly suited to the decarbonatation of gas flows contaminated by CO2.
    Type: Grant
    Filed: July 24, 2002
    Date of Patent: September 9, 2003
    Assignee: Ceca, S.A.
    Inventors: Marie-Therese Grandmougin, Francis Mayolet, Jacques Rouet
  • Patent number: 6524544
    Abstract: A method and apparatus for the decontamination of fluid ammonia are described. Liquid or gaseous ammonia is purified of contaminants by passage through an adsorbent bed, the contaminants accumulating in the bed. A portion of the purified ammonia discharged from the bed is decomposed to hydrogen and nitrogen. The hydrogen is used to regenerate an adsorbent bed which has accumulated sufficient contaminants to reduce its ability to further decontaminate incoming ammonia satisfactorily. Preferably there are a plurality of interconnected adsorbent beds, with some being operated for ammonia decontamination while others are being regenerated, with their operations being reversed as needed to maintain a continual production of decontaminated ammonia from the plurality of beds. Computers or other controllers can be used to control such bed operations and interchanges. Internal production of hydrogen makes the system self-contained and no addition of hydrogen is needed.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: February 25, 2003
    Assignee: Aeronex, Inc.
    Inventors: Daniel Alvarez, Jr., Jeffrey J. Spiegelman
  • Patent number: 6471748
    Abstract: The invention comprises a PSA process and apparatus wherein the fixed adsorbent bed comprises an equilibrium zone and a mass transfer zone. Further, the equilibrium and mass transfer zones each comprise at least one adsorbent material, selective for the adsorption of a more selectively adsorbable component, that is selected on the basis of the performance of that adsorbent material under the process conditions applicable to the zone.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: October 29, 2002
    Assignee: Praxair Technology, Inc.
    Inventor: Mark William Ackley
  • Patent number: 6409800
    Abstract: Nitrogen oxides and low molecular weight hydrocarbons are removed from air by subjecting the air to a temperature swing adsorption process using as the adsorbent a composite zeolite product containing both zeolite A and zeolite X. The composite zeolite product is preferably prepared by forming a mixture of an agglomerate of silica and sodium zeolite X having a Si/Al atomic ratio in the range of about 0.9 to less than about 1.2 and a water-soluble sodium aluminate salt; maintaining the mixture at a temperature in the range of about 25 to about 100° C. for a period of time sufficient to convert at least 50% of the silica to sodium zeolite A; and at least partially exchanging the zeolite A-containing product with divalent cations, preferably calcium ions.
    Type: Grant
    Filed: August 28, 2000
    Date of Patent: June 25, 2002
    Assignee: The BOC Group, Inc.
    Inventors: Adeola F. Ojo, Frank R. Fitch, Martin Bülow
  • Patent number: 6387161
    Abstract: Provided are a system and method for nitrous oxide purification, wherein the nitrous oxide product for use in semiconductor manufacturing. The system and process involve a first sub-system having a purification tank for holding a liquefied nitrous oxide, therein; a vaporizer in communication with the purification tank to receive, vaporize and convey a nitrous oxide vapor back to the purification tank; a distillation column disposed on a distal end of the purification tank to receive a nitrous oxide vapor; a condenser disposed on the distillation column, wherein light impurities are removed and wherein a nitrous oxide devoid of light impurities is conveyed and converted into vapor in the vaporizer. A second sub-system having a first dry bed vessel is disposed downstream of the vaporizer to receive the vapor and reacting the acid gas therein; a second dry bed vessel downstream of the first dry bed vessel for removing water and ammonia in the vapor.
    Type: Grant
    Filed: November 27, 2000
    Date of Patent: May 14, 2002
    Assignee: American Air Liquide, Inc.
    Inventors: Derong Zhou, John P. Borzio, Earle Kebbekus, David Miner
  • Patent number: 6379430
    Abstract: A process, especially a PSA or TSA process, for purifying a gas containing at least carbon dioxide (CO2) as impurity, in which the carbon dioxide is adsorbed on an adsorbent comprising particles of activated alumina. According to this process, the activated alumina has a specific surface area of between 200 m2/g and 299 m2/g and contains at least 80% aluminum oxide (Al2O3), silicon oxide (SiO2), iron oxide (Fe2O3) and from 0.001% to 7.25% of at least one oxide of at least one alkali or alkaline-earth metal, such as sodium and potassium oxides. According to the invention, the gas stream to be purified is air or a synthesis gas.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: April 30, 2002
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'exploitation des procedes Georges Claude
    Inventor: Christian Monereau
  • Patent number: 6238460
    Abstract: Substantially all of the carbon dioxide is removed from a gas containing up to about 1% by volume carbon dioxide by subjecting the gas to a pressure swing adsorption process using a two layer adsorption system, wherein the first layer contains activated alumina and the second layer is a zeolite or a combination of zeolites having a silicon to aluminum atomic ratio of at least 1.5. The process is particularly suitable for removing substantially all carbon dioxide and water vapor contained in air prior to subjecting the air to cryogenic distillation.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: May 29, 2001
    Assignee: The BOC Group, Inc.
    Inventors: Shuguang Deng, Ravi Kumar, Martin Bülow, Frank R. Fitch, Adeola Florence Ojo, Craig S. Gittleman
  • Patent number: 6152991
    Abstract: The invention comprises a PSA process and apparatus wherein the fixed adsorbent bed comprises an equilibrium zone and a mass transfer zone. Further, the equilibrium and mass transfer zones each comprise at least one adsorbent material, selective for the adsorption of a more selectively adsorbable component, that is selected on the basis of the performance of that adsorbent material under the process conditions applicable to either the equilibrium or mass transfer zones.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: November 28, 2000
    Assignee: Praxair Technology, Inc.
    Inventor: Mark William Ackley
  • Patent number: 6146447
    Abstract: Process and single-bed pressure swing adsorption system for separating gas mixtures, especially air. The process includes a simultaneous countercurrent product purge and partial product repressurization step which shortens cycle time and improves overall system operation.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: November 14, 2000
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Shivaji Sircar, Tarik Naheiri, Jochen Rainer Fischer
  • Patent number: 6113671
    Abstract: A process for controlling the atmosphere in a container including the steps of passing a pressurized portion of the atmosphere serially through a plurality of separate but inter-communicating adsorbent beds which selectively adsorb water vapor, ethylene, carbon dioxide and nitrogen from the compressed atmosphere, then isolating the ethylene-selective adsorbent and desorbing ethylene therefrom, then desorbing nitrogen from the nitrogen-selective adsorbent and purging the carbon dioxide-selective bed, the ethylene-selective bed and the water vapor-selective bed with the desorbed nitrogen, and returning the purge and purged gas mixture to the container.
    Type: Grant
    Filed: May 19, 1997
    Date of Patent: September 5, 2000
    Inventor: Michael E. Garrett
  • Patent number: 6059858
    Abstract: Oxygen is removed from gas streams by subjecting the gas stream to a pressure swing adsorption process carried out at temperature in the range of 300 to 1400.degree. C. using as adsorbent a perovskite material having the structural formula A.sub.1-x M.sub.x BO.sub.3-.delta., where A is a rare earth ion, M is Na, Ca, Sr, Ba or mixtures of these, B is Co, Mn, Cr or Fe, x varies from 0.1 to 1 and .delta. is the deviation from stoichiometric composition resulting from the substitution of Sr, Ca and Ba for rare earth ions.
    Type: Grant
    Filed: October 20, 1998
    Date of Patent: May 9, 2000
    Assignee: The BOC Group, Inc.
    Inventors: Yue-Sheng Lin, Donald L. MacLean, Yongxian Zeng
  • Patent number: 6017382
    Abstract: A method of processing semiconductor manufacturing exhaust gases for recovering at least hexafluoroethane in which a feed stream composed of the exhaust gases is passed through an adsorbent bed selected to adsorb oxygen, and also nitrogen if present, but not to appreciably adsorb the hexafluoroethane. As a result, a product stream, discharged from the adsorbent bed, has a higher concentration of hexafluoroethane than in the feed stream. In one embodiment, only a single adsorbent such as carbon molecular sieve is provided to adsorb the oxygen or a modified 4A zeolite could be used to adsorb both oxygen and nitrogen. When nitrogen is a potential constituent, layers of carbon molecular sieve and zeolite are provided to adsorb the oxygen and then the nitrogen, respectively. A third adsorbent, preferably 5A zeolite may be provided in addition to the foregoing two adsorbents to also adsorb any carbon tetrafluoride produced as a by-product.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: January 25, 2000
    Assignee: The BOC Group, Inc.
    Inventors: Wenchang Ji, Dongmin Shen, Ravi Jain, Arthur I. Shirley, Atul M. Athalye, Piotr J. Sadkowski
  • Patent number: 6004377
    Abstract: SF.sub.6 gas is collected from the inside of a gas insulated machine during maintenance and inspection and is refined. Compositions of the refined SF.sub.6 gas are analyzed and confirmed to be reusable at the site. In the process of SF.sub.6 gas collecting and refining, acidic gases are neutralized and removed by a dry method using filters and the refined SF.sub.6 gas is collected in a collecting tank. In particular, after the refining, the composition of the collected SF.sub.6 gas is measured and confirmed by analysis equipment to quantitatively confirm whether or not the refined SF.sub.6 gas is reusable.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: December 21, 1999
    Assignees: Hitachi Engineering & Services Co., Ltd., Showa Denko K.K.
    Inventors: Shin Tamata, Toru Tsubaki, Akio Nadamura, Koji Ito, Toshio Ohi, Hiromoto Ohno
  • Patent number: 5989314
    Abstract: A pressure swing adsorption air prepurifier is used to remove water, carbon dioxide and hydrocarbons from a feed gas stream, such as a feed air stream, passing to a cryogenic air separation plant. By the incorporation of a regenerative heat exchange as an integral part of the air prepurifier, the cooling effects of the desorption of water are stored and transferred so as to cool the incoming feed air stream passing to the adsorbent material within the air prepurifier. The productive capacity of the adsorbent material is enhanced thereby.
    Type: Grant
    Filed: December 16, 1997
    Date of Patent: November 23, 1999
    Assignee: Praxair Technology, Inc.
    Inventors: Herbert Raymond Schaub, Frederick Wells Leavitt
  • Patent number: 5914455
    Abstract: An air prepurification process which includes, as a first step, a pressure swing adsorption process in which the air is passed through a bed of adsorbent which contains activated alumina, thereby effecting removal of substantially all moisture and most carbon dioxide from the feed air and as a second step, a temperature swing adsorption process in which the dried feed air is passed through a bed of carbon dioxide-selective adsorbent, thereby removing substantially all of the carbon dioxide remaining in the feed air. The feed air may be passed through beds of hydrogen oxidation and carbon monoxide oxidation catalysts between the first and second steps to convert any hydrogen and carbon monoxide in the feed air to water vapor and carbon dioxide, respectively, these components being removed from the feed air during the second step.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: June 22, 1999
    Assignee: The BOC Group, Inc.
    Inventors: Ravi Jain, James K. Tseng
  • Patent number: 5871564
    Abstract: A pressure swing adsorption apparatus to vary selectively the concentration of at least one constituent of a gaseous mixture by sending a gaseous mixture into an adsorber to generate a particular product gas while delivering to another adsorber both a predetermined portion of the product gas to purge the other adsorber of its adsorbed gas and a selected amount of the product gas, independent of the flow rate and in addition to the predetermined portion, to produce a desired relative concentration of the constituents of the product gas from a range of relative concentrations.
    Type: Grant
    Filed: June 16, 1997
    Date of Patent: February 16, 1999
    Inventor: Norman Richard McCombs
  • Patent number: 5769928
    Abstract: The invention comprises a PSA gas prepurifier for the removal of contaminants present in a feed gas stream. The prepurifier of the invention has a bed of adsorbent material which comprises at least two discrete layers of adsorbents, at least one of the adsorbents being comparatively strong and at least another of the adsorbents being comparatively weak.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: June 23, 1998
    Assignee: Praxair Technology, Inc.
    Inventor: Frederick Wells Leavitt
  • Patent number: 5738703
    Abstract: This invention is a method to produce a substitute for peat moss comprising:mixing in a mixer adsorptive cellulosic material with an effective amount of an inoculum containing cellulose degrading microorganism such as lignin cellulose degrading bacteria upon anaerobic fermentation and manure municipal waste or similar waste, manufactured feedstock or a blend of these,transferring said mixture to a chamber,allowing the temperature of said mixture to rise in said chamber until said cellulosic material changes color, thenaerating said mixture to remove water vapor, ammonia and other gases in an exhaust gas and then removing said mixture from said chamber for use as a substitute for peat moss and other uses.
    Type: Grant
    Filed: March 11, 1996
    Date of Patent: April 14, 1998
    Inventor: William E. Bandurski
  • Patent number: 5427609
    Abstract: A device (10) for removing contaminants from truck air systems or the like includes an assembly including a desiccant canister (100), a carrier (46), and a bottom closure (28) vertically removable in a passage (14) of a collar (12) mounted to the truck. The carrier (46) includes a horizontal plate (48) which divides the passage (14) into a coalescing chamber having a horizontally orientated, tubular coalescing filter (98) extending vertically above and diametrically over the sump including an electrically actuated purge valve (42) of the bottom closure (28). Air is directed vertically downward from the filter (98) by vertical legs (62) extending down from the horizontal plate (48) and on opposite sides of the filter (98). A follower plate (118) is biased in the canister (100) against the desiccant beads (116) by a wave spring (140) sandwiched thereagainst by a slideable retainer (142) fixed in the side wall (104) of the canister (100).
    Type: Grant
    Filed: September 14, 1993
    Date of Patent: June 27, 1995
    Assignee: Horton Industries, Inc.
    Inventors: Norbert P. Zoglman, Daniel J. Fitzsimmons, Brian J. Larson
  • Patent number: 5425242
    Abstract: A process and apparatus for the recovery and purification of a contaminated refrigerant withdrawn from a refrigeration or refrigerant recovery system which employs a compressor and an adsorbent selective for the adsorption of halogenated hydrocarbons. The adsorbent is selected from the group consisting of silicalite, faujasites, steamed and rare earth exchanged zeolite Y, mordenite, ZSM-5 and mixtures thereof, and more particularly the group consisting of a low cerium rare earth exchanged zeolite Y-84, a low cerium rare earth exchanged zeolite LZ-210, Breck Structure Six, ECR-32, and mixtures thereof. A significant increase in the capacity of these adsorbents over conventional adsorbents combined with the use of novel process steps to recover, purify and return a purified refrigerant to the refrigeration system result in significant cost savings at reduced risk of release of halogenated hydrocarbons to the environment.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: June 20, 1995
    Assignee: UOP
    Inventors: Stephen R. Dunne, Mark T. Staniulis, Alan P. Cohen
  • Patent number: 5346536
    Abstract: A process for separating nitrogen which comprises, with a nitrogen gas separation apparatus of a pressure-swing adsorption type, a gas transfer step between an adsorber having completed an adsorption step with another adsorber having completed a regeneration step. The gas transfer step further comprising discharging part of the gas being transferred out of the system. This process provides, with compact equipment, high-purity product nitrogen with a purity of at least 99.99%, which has been considered difficult to obtain with conventional pressure-swing adsorption apparatuses.
    Type: Grant
    Filed: March 16, 1993
    Date of Patent: September 13, 1994
    Assignee: Kuraray Chemical Co., Ltd.
    Inventors: Isao Kaneshige, Tsuneo Genba, Takeshi Tamaru, Tetsuhiko Matsuura
  • Patent number: 5330561
    Abstract: A process for separating a feed gas mixture into a more strongly adsorbable component and a less strongly adsorbable component in a plurality of adsorbent beds containing an adsorbent selective for the more strongly adsorbable component using pressure equalization between beds after initial depressurization to provide a purge gas, using countercurrent evacuation wherein at least two adsorption beds are countercurrently evacuated simultaneously in overlapping countercurrent evacuation steps in the plurality of adsorption beds, and using a combination of less strongly adsorbable component and feed gas mixture to repressurize the adsorbent bed. Oxygen product can be recovered from air at high recovery using the process.
    Type: Grant
    Filed: March 25, 1993
    Date of Patent: July 19, 1994
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Ravi Kumar, Tarik Naheiri, Charles F. Watson
  • Patent number: 5268022
    Abstract: A pressure swing adsorption plant for the separation of gas mixtures includes at least one pressure vessel containing an adsorbent bed that is able preferentially to adsorb at least one component of the gas mixture. The pressure vessel has an inlet at its top for the feed gas mixture, an outlet at its bottom for non-adsorbed gas and at least one heat conductive member containing a liquid medium arranged within the bed such that, in operation, heat is able to be conducted by convection through the liquid from a region of maximum temperature at or near the bottom of the bed to a region of minimum temperature at or near the top of the bed.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: December 7, 1993
    Assignee: The BOC Group plc
    Inventors: Michael E. Garrett, John B. Gardner