Ring Containing Organic Compound Patents (Class 96/13)
  • Patent number: 7591878
    Abstract: The invention relates to gas separation, in particular to separation of CO2 from CO2-rich liquids, particularly from CO2 absorption liquids used in the removal of CO2 from off-gases or product flows, such as natural gas or synthesis gas. According to the invention, CO2 is separated from a CO2-rich liquid by a method comprising a step wherein, under elevated pressure, said liquid is contacted with a membrane based on polyacetylene substituted with trimethylsilyl groups such that the pressure across the membrane is at least 1 bar and that at least a part of the CO2 is transported from the liquid through the membrane.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: September 22, 2009
    Assignee: Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek TNO
    Inventors: Paul Hubert M. Feron, Vladimir Vasilevich Volkov, Valery Samuilovich Khotimsky, Vladimir Vasil'evich Teplyakov
  • Publication number: 20090205500
    Abstract: The invention discloses a composition comprising a hybrid composite organic-inorganic membrane. The hybrid organic-inorganic membrane according to the present invention may comprise an amorphous porous layer incorporating organic functionalities. The amorphous porous layer may be deposited on a porous alumina substrate by chemical vapor deposition (CVD). The amorphous porous layer may comprise a single top-layer (STL), multiple top-layers (MTL) or mixed top-layers (XTL). The substrate may comprise a single layer or multiple graded layers of alumina.
    Type: Application
    Filed: February 28, 2008
    Publication date: August 20, 2009
    Inventors: Shigeo Ted Oyama, Yunfeng Gu, Joe D. Allison, Garry C. Gunter, Scott A. Scholten
  • Patent number: 7572321
    Abstract: A membrane 12 that exhibits superior condensation resistance regardless of the type of moisture-permeable resin, that has satisfactory adhesion between a porous film and a reinforcing member, and that can be manufactured in a simple manner. The membrane 12 is a laminated article 23 containing a porous film 20 and a reinforcing member 40, and the reinforcing member 40 has a moisture-permeable resin layer 30 on the side of an interface 50 with the porous film 20. To reliably form the moisture-permeable resin layer (moisture-permeable resin film) 30, the average pore diameter of the porous film 20 is preferably 0.01 to 10 ?m, and the porosity of the reinforcing member 40 is preferably 30 to 95%. According to the membrane 12 of the present invention, even if the moisture-permeable resin is water-soluble (for example, polyvinyl alcohol), condensation resistance is still satisfactory.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: August 11, 2009
    Assignee: Japan Gore-Tex, Inc.
    Inventors: Keiichi Yamakawa, Takashi Imai
  • Patent number: 7556677
    Abstract: There is provided an asymmetric integrally skinned membrane comprising a polyimide and another polymer selected from the group consisting of polyvinylpyrrolidone, sulfonated polyetheretherketones and mixtures thereof. The membrane which is substantially insoluble in an organic solvent and substantially defect-free can be useful as a separation membrane.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: July 7, 2009
    Assignee: Vaperma Inc.
    Inventors: Richard Cranford, Christian Roy
  • Patent number: 7537646
    Abstract: A fuel system includes a fuel deoxygenator for removing oxygen from a liquid fuel. A vaporizer is in fluid communication with the fuel deoxygenator. The vaporizer vaporizes at least a portion of the liquid fuel to produce vaporized fuel. At least a portion of the vaporized fuel pre-mixes with oxidizer to reduce formation of undesirable emissions.
    Type: Grant
    Filed: October 11, 2005
    Date of Patent: May 26, 2009
    Assignee: United Technologies Corporation
    Inventors: Alexander G Chen, Jeffrey M. Cohen
  • Patent number: 7510595
    Abstract: The present invention includes a method, composition and apparatus for forming a nanoparticle filled polymer having similar gas selectivity and greater gas permeability than the native polymer. The nanoparticle filled polymer includes one or more polymeric materials and one or more nanoparticles dispersed within the one or more polymeric materials that increasing the permeability of the nanoparticle filled polymers relative to the permeability of the native polymer membrane.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: March 31, 2009
    Assignee: Board of Regents, The University of Texas System
    Inventors: Benny D. Freeman, Scott Matteucci, Haiqing Lin
  • Patent number: 7497896
    Abstract: Methods for treating a gas mixture of at least propylene and propane, in order to separate the propylene from the propane. The gas mixture is brought into contact with a membrane enables the selective permeation of the propylene with respect to the propane. A propylene-enriched permeate and a propane-enriched retentate is formed. The propylene concentration of the permeate in the membrane is then reduced with a sweeping gas.
    Type: Grant
    Filed: April 7, 2004
    Date of Patent: March 3, 2009
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes George Claude
    Inventors: Emmanuelle Bromet, Guillaume De Souza, Olivier Riu
  • Patent number: 7491262
    Abstract: There is provided a nanocomposite membrane comprising an Ag-nanoparticle/polymer nanocomposite, in which the Ag-particles are uniformly dispersed in the polymer matrix, and a support membrane for supporting the nanocomposite, as well as a process of preparing said membrane. The nanocomposite membrane of the present invention comprising a neutral Ag-nanoparticle as an olefin carrier, which is chemically stable, has excellent long-term operation performance characteristics as well as high selectivity and permeability. Thus, it can be advantageously used for the separation of olefin from an olefin/paraffin mixture.
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: February 17, 2009
    Assignee: Korea Institute of Science and Technology
    Inventors: Yong Soo Kang, Kook Heon Char, Sang Wook Kang
  • Patent number: 7485173
    Abstract: The present invention is for novel high performance cross-linkable and cross-linked mixed matrix membranes and the use of such membranes for separations such as for CO2/CH4, H2/CH4 and propylene/propane separations. More specifically, the invention involves the preparation of cross-linkable and cross-linked mixed matrix membranes (MMMs). The cross-linkable MMMs were prepared by incorporating microporous molecular sieves or soluble high surface area microporous polymers (PIMs) as dispersed microporous fillers into a continuous cross-linkable polymer matrix. The cross-linked MMMs were prepared by UV-cross-linking the cross-linkable MMMs containing cross-linkable polymer matrix such as BP-55 polyimide. Pure gas permeation test results demonstrated that both types of MMMs exhibited higher performance for CO2/CH4 and H2/CH4 separations than those of the corresponding cross-linkable and cross-linked pure polymer matrices.
    Type: Grant
    Filed: December 15, 2005
    Date of Patent: February 3, 2009
    Assignee: UOP LLC
    Inventors: Chunqing Liu, Jeffrey J. Chiou, Stephen T. Wilson
  • Patent number: 7455706
    Abstract: A filter system including a method for self cleaning the filter system of an electronic equipment enclosure where air flow is monitored either by monitoring fan performance of air flow velocity through the enclosure. The system includes two filters elements, an upstream ASHRAE or HEPA filter element to block particulate matter and a downstream PTFE filter element to block water vapor. The ASHRAE or HEPA filter element is relatively inexpensive and easy to clean. The PTFE filter element is more expensive and difficult to clean. Thus, the cheaper filter is used to protect the more expensive filter from contaminants and to increase its useful life.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: November 25, 2008
    Assignee: Emerson Network Power, Energy Systems, North America, Inc.
    Inventors: Steven R. Latham, Marvin P. Garcia, Michael R. Cosley
  • Patent number: 7422623
    Abstract: This abstract discusses membranes needed to separate fluids for the production of oxygen-enriched air, nitrogen-enriched-air, for the separation of carbon dioxide from hydrocarbons, and the separation of hydrogen from various petrochemical and oil refining streams. Membranes are needed that provide a resistance to interaction with process components or contaminants, provide the mechanical strength required to withstand high membrane differential pressures and high process temperatures, and exhibit sufficient maximum strain such that membranes are not brittle and can easily be formed into desirable membrane forms. Membranes of polyimide polymers, particularly polyimide polymers sold under the trade name P-84, are annealed in a controlled annealing step to improve the mechanical properties of the polymers used to make separation membranes.
    Type: Grant
    Filed: March 2, 2005
    Date of Patent: September 9, 2008
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Okan Max Ekiner, John W. Simmons
  • Patent number: 7393388
    Abstract: A deoxygenator includes a plurality of permeable membranes spirally wound about an exhaust tube for removing dissolved oxygen from a hydrocarbon fuel. The permeable membrane is spirally wrapped about the exhaust tube and defines fuel passages and exhaust passages. The fuel passages and exhaust passages alternate such that each fuel passage is bounded on each adjacent side by an exhaust passage. An oxygen partial pressure differential is generated across the permeable membrane to draw dissolved oxygen from fuel in the fuel passage. The dissolved oxygen is then communicated through openings about the circumference of the exhaust tube and out the deoxygenator.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: July 1, 2008
    Assignee: United Technologies Corporation
    Inventors: Louis J. Spadaccini, Harry Cordatos, Thomas Gregory Tillman, Alexander G. Chen, Louis Chiappetta, James R. Irish, Foster Phillip Lamm, Stephen R. Jones
  • Patent number: 7393391
    Abstract: Anisotropic hydrophobic/hydrophilic nanoporous membranes and methods of forming anisotropic hydrophobic/hydrophilic nanoporous membranes are disclosed. The method of forming the nanoporous membrane includes growing a nanoporous oxide film on a substrate. A nanoporous membrane having a top side and a bottom side can then be formed by partially separating the nanoporous oxide film from the substrate. A fluorocarbon film can be deposited on the top side of the nanoporous membrane by plasma polymerization. The disclosed anisotropic hydrophobic/hydrophilic nanoporous membranes can have extremely different hydrophobicity between the top side and the bottom side of the nanoporous membrane.
    Type: Grant
    Filed: October 21, 2004
    Date of Patent: July 1, 2008
    Assignee: STC.UNM
    Inventors: Gabriel P. Lopez, Plamen B. Atanassov, Dmitri A. Brevnov, Marcos Barela
  • Patent number: 7393383
    Abstract: Membranes are used to separate fluids for the production of oxygen-enriched air, nitrogen-enriched-air, for the separation of carbon dioxide from hydrocarbons, and the separation of hydrogen from various petrochemical and oil refining streams. Membranes are discussed that provide a resistance to interaction with process components or contaminants, which can lead to plasticizing of the membrane, while providing the mechanical strength required to withstand high membrane differential pressures and high process temperatures. Membranes of blended polymers are used to improve the mechanical strength of the polymers used to make separation membranes. Specifically, polyimide polymers are combined with a blend polymer that is a polyamide and/or a polyamide-imde polymer. The resulting polymer mix is used to produce various forms of high strength, chemically resistant membranes, including hollow-fiber membranes that are suitable for high pressure, high temperature applications.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: July 1, 2008
    Assignee: L'Air Liquide, Societe Anonyme A Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Okan Max Ekiner, John Warren Simmons
  • Patent number: 7344578
    Abstract: A breather valve device for a container for an electronic control unit, includes a support structure including, a substantially planar wall having first and second surfaces intended to face outwardly and inwardly of the container respectively, and in which is formed an aperture, and a projecting, essentially cylindrical, tubular wall extending from the first surface of the planar wall, substantially around the aperture; an interceptor element having a smaller cross section than the passage cross section of the tubular wall and of the aperture; the interceptor element being disposed inside an axially intermediate portion of the tubular wall, spaced radially from the latter so as to define, with respect to the tubular wall, a narrow annular gap; the interceptor element being connected to the support structure by at least one connector formation. The support structure, the interceptor element and the connector formation are integrally formed in one piece of molded plastics material.
    Type: Grant
    Filed: November 3, 2004
    Date of Patent: March 18, 2008
    Assignee: Gate S.R.L.
    Inventor: Aulo Origlia
  • Patent number: 7303609
    Abstract: A process for the manufacture of a polyimide hollow fibre comprising: (i) providing a dope solution comprising one or more polyimides dissolved in a solvent comprising 60-100 wt % N-methylpyrollidone and 0-40 wt % ethanol, (ii) providing a bore fluid, (iii) generating a tube of the dope solution filled with the bore fluid, (iv) bringing the product of step (iii) into contact with a coagulation solvent to form a hollow fiber.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: December 4, 2007
    Assignee: British Gas Asia Pacific Pte Limited
    Inventors: Tai-Shung Chung, Rong Wang, Ji Zhong Ren, Chun Cao, Ye Liu, Dong-Fei Li
  • Patent number: 7291204
    Abstract: A separation membrane module having hollow fibers, wherein a plurality of hollow fibers are heated and melted to bond and thermally fuse the external surfaces of the hollow fibers with each other; and a method of manufacturing a separation membrane module having hollow fibers whereby the ends of a plurality of hollow fibers are inserted into a sheath, the sheath and the hollow fibers are tightly bonded together to form spaces, and the sheath portion into which hollow fibers have been inserted is heated up to the temperature at which the surfaces of the hollow fibers melt, with the spaces thus formed kept in a decompressed state, so that the exterior surfaces of the hollow fibers are thermally fused and integrated together.
    Type: Grant
    Filed: June 5, 2003
    Date of Patent: November 6, 2007
    Assignee: Gore Enterprise Holdings, Inc.
    Inventors: Masahiro Suzuki, Tsunehiko Naganuma
  • Patent number: 7264650
    Abstract: A semipermeable separation element includes (a) a porous substrate, and (b) a film formed on the microporous substrate; the film comprising a silicone elastomer and a nanoparticle filler. The film preferably has an oxygen enrichment selectivity of at least 30, or even 60, over nitrogen. Methods of making and using the same and filter cartridges incorporating the same are also described.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: September 4, 2007
    Assignee: North Carolina Agricultural and Technical State University
    Inventors: Jianzhong Lou, Arvind Vyas Harinath, Shamsuddin Ilias, Jag Sankar
  • Patent number: 7247191
    Abstract: A composition of and a method of making high performance hollow fiber membranes is described. The membranes have a high resistance to plasticization by use of a predetermined amount of crosslinking. The preferred polymer material for the membrane is a polyimide polymer comprising covalently bonded ester crosslinks. The resultant hollow fiber membrane exhibits a high permeability of CO2 in combination with a high CO2/CH4 selectivity. Another embodiment provides a method of making the hollow fiber membrane from a monesterified polymer followed by final crosslinking after hollow fiber formation.
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: July 24, 2007
    Assignee: Chevron U.S.A. Inc.
    Inventors: William J. Koros, David Wallace, John Wind, Stephen J. Miller, Claudia Staudt-Bickel
  • Patent number: 7179322
    Abstract: A method of supplying oxygen rich air to the passengers and crew on board a passenger aircraft by use of a highly permeable oxygen enrichment unit, wherein the fiber tubes of the hollow fiber membranes used to separate normal air into oxygen rich and nitrogen rich fractions in the oxygen enrichment unit are subjected to a modification technique before the tubes are coated with a selective polymer.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: February 20, 2007
    Assignee: Smartmembrane Corp.
    Inventors: Arthur Lyons, Andrew Van Den Gross
  • Patent number: 7166148
    Abstract: A method of producing composite, hollow fibre gas separation membranes, wherein external surfaces of the porous hollow fibre tubes used in the construction of the membranes are subjected to a modification technique before the external surfaces are coated with a thin layer of selective polymer so as to increase the number of pores in the fibre surface.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: January 23, 2007
    Assignee: Smart Membrane Corp.
    Inventors: Arthur Lyons, Andrew Van Den Gross
  • Patent number: 7166146
    Abstract: A mixed matrix membrane is provided which comprises a continuous phase organic polymer and small pore molecular sieves dispersed therein. The molecular sieves have a largest minor crystallographic free diameter of 3.6 Angstroms or less. When these molecular sieves are properly interspersed with a continuous phase polymer, the membrane will exhibit a mixed matrix membrane effect, i.e., a selectivity increase of at least 10% relative to a neat membrane containing no molecular sieves. Finally, methods for making and using such mixed matrix membranes to separate gases from a mixture containing two or more gases are also disclosed.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: January 23, 2007
    Assignee: Chevron U.S.A. Inc.
    Inventors: Stephen J. Miller, Alexander Kuperman, De Q. Vu
  • Patent number: 7138006
    Abstract: A mixed matrix membrane is provided which comprises a continuous phase organic polymer and small pore alumina containing molecular sieves dispersed therein. The molecular sieves have a silica-to-alumina molar ratio of less than 1.0, more preferably, less than 0.3, and most preferably less than 0.1. In some cases, the molecular sieves have no appreciable amounts of silica. Exemplary compositions include aluminophosphates (AlPO) and silicoaluminophosphates (SAPO). When these molecular sieves are properly interspersed with a continuous phase polymer, the membrane will exhibit a mixed matrix membrane effect, i.e., a selectivity increase of at least 10% relative to a neat membrane containing no molecular sieves. The molecular sieves have pores with a largest minor crystallographic free diameter of 4.0 Angstroms or less. Finally, methods for making and using such mixed matrix membranes to separate gases from a mixture containing two or more gases are also disclosed.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: November 21, 2006
    Assignee: Chevron U.S.A. Inc.
    Inventors: Stephen J. Miller, Alexander Kuperman, De Q. Vu
  • Patent number: 7097682
    Abstract: The present invention provides a culture container and a cap for a container having a ventilation filter medium or a medium similar thereto that can exchange carbon dioxide gas in the culture container with atmospheric air, and prevent the contamination of sterilized culture medium inside the culture container with fungi, mites, and the like. A culture bottle includes a bottle unit, and a cap that is mounted on an opening. The cap includes a cap unit, and a ventilation filter medium. A hole is provided in the cap unit. The ventilation filter medium includes a plurality of micropores having a pore diameter between 0.1 and 50 micrometers, and is mounted on the hole.
    Type: Grant
    Filed: October 11, 2002
    Date of Patent: August 29, 2006
    Assignee: Daikin Industries, Ltd.
    Inventors: Osamu Tanaka, Hideki Aomi, Hideyuki Kiyotani, Yoshiyuki Shibuya, Seiichi Hirano
  • Patent number: 7083660
    Abstract: A connector casing E required to have a sealing property includes a cover 2. The cover 2 has a cover main body 10 provided with a large vent hole H0 passing through the connector casing E in an inward and outward direction and having a predetermined inner diameter size. A permeable sheet S, which permits permeation of a gas and prevents permeation of a liquid and a solid, is integrally joined to an outside peripheral part of the large vent hole H0 so as to cover the large vent hole H0 from its outside. A cover insert member C is disposed outside the permeable sheet S to cover the permeable sheet from the outside, and a ring-shaped protrusion 22 is hermetically joined to the casing main body 10. The cover insert member C1 is provided with a small vent hole H1 which has an inner diameter smaller than the large vent hole H0 and communicates with the large vent hole H0 through the permeable sheet S.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: August 1, 2006
    Assignee: Tokai Kogyo Company Limited
    Inventors: Kouichi Hara, Atsushi Fukunishi
  • Patent number: 7074256
    Abstract: A polyphosphazene having a glass transition temperature (“Tg”) of approximately ?20° C. or less. The polyphosphazene has at least one pendant group attached to a backbone of the polyphosphazene, wherein the pendant group has no halogen atoms. In addition, no aromatic groups are attached to an oxygen atom that is bound to a phosphorus atom of the backbone. The polyphosphazene may have a Tg ranging from approximately ?100° C. to approximately ?20° C. The polyphosphazene may be selected from the group consisting of poly[bis-3-phenyl-1-propoxy)phosphazene], poly[bis-(2-phenyl-1-ethoxy)phosphazene], poly[bis-(dodecanoxypolyethoxy)-phosphazene], and poly[bis-(2-(2-(2-?-undecylenyloxyethoxy)ethoxy)ethoxy)phosphazene]. The polyphosphazene may be used in a separation membrane to selectively separate individual gases from a gas mixture, such as to separate polar gases from nonpolar gases in the gas mixture.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: July 11, 2006
    Assignee: Battelle Energy Alliance, LLC
    Inventors: Frederick F. Stewart, Mason K. Harrup, Christopher J. Orme, Thomas A. Luther
  • Patent number: 7025804
    Abstract: A method of separating or concentrating hydrocarbon-containing gas mixtures such as hydrogen from hydrocarbons, carbon dioxide from hydrocarbons, nitrogen from hydrocarbons, and hydrocarbons from one another using a selectively permeable membrane. The method is well suited to separate hydrocarbon-containing mixtures such as those generated by petroleum refining industries, petrochemical industries, natural gas processing, and the like. The membranes exhibit extremely good resistance to plasticization by hydrocarbon components in the gas mixture under practical industrial process conditions.
    Type: Grant
    Filed: November 25, 2003
    Date of Patent: April 11, 2006
    Assignee: L'Air Liquide, Societe Anonyme A Directoire et Conseil De Surveillance Pour L'Etude et L'Exploitation Des Procedes Georges Claude
    Inventors: John W. Simmons, Sudhir Kulkarni, Okan M. Ekiner
  • Patent number: 7018445
    Abstract: The present invention provides a selectively gas permeable membrane that has a superior combination of permeability and selectivity. The membrane composition includes a Type 1 copolyimide uniformly blended with a Type 2 copolyimide, which polymers are defined by chemical structure more specifically in this disclosure. The invention also provides a method of using the membrane of the copolyimide blend to separate components of gas mixtures.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: March 28, 2006
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance Pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: John W. Simmons, Okan Max Ekiner
  • Patent number: 6997971
    Abstract: A cross-linked, supported polybenzimidazole membrane for gas separation is prepared by reacting polybenzimidazole (PBI) with the sulfone-containing crosslinking agent 3,4-dichloro-tetrahydro-thiophene-1,1-dioxide. The cross-linked reaction product exhibits enhanced gas permeability to hydrogen, carbon dioxide, nitrogen, and methane as compared to the unmodified analog, without significant loss of selectivity, at temperatures from about 20 degrees Celsius to about 400 degrees Celsius.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: February 14, 2006
    Assignee: The Regents of the University of California
    Inventors: Jennifer S. Young, Gregory S. Long, Brent F. Espinoza
  • Patent number: 6977009
    Abstract: A metal-coated, wire-reinforced polymer electrolyte membrane that is permeable only to protons and hydrogen is disclosed. The metal-coated, wire-reinforced polymer electrolyte membrane has a surface microstructure that prevents cracking of the metal coating during hydration. The metal-coated, wire-reinforced polymer electrolyte membrane can be used in liquid-type fuel cells to prevent crossover of fuel, gas and impurities.
    Type: Grant
    Filed: August 7, 2002
    Date of Patent: December 20, 2005
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alfred I-Tsung Pan, Yoocham Jeon
  • Patent number: 6946015
    Abstract: A cross-linked, supported polybenzimidazole membrane for gas separation is prepared by layering a solution of polybenzimidazole (PBI) and ?,??dibromo-p-xylene onto a porous support and evaporating solvent. A supported membrane of cross-linked poly-2,2?-(m-phenylene)-5,5?-bibenzimidazole unexpectedly exhibits an enhanced gas permeability compared to the non-cross linked analog at temperatures over 265° C.
    Type: Grant
    Filed: June 26, 2003
    Date of Patent: September 20, 2005
    Assignee: The Regents of the University of California
    Inventors: Betty S. Jorgensen, Jennifer S. Young, Brent F. Espinoza
  • Patent number: 6923846
    Abstract: A method for fabricating a composite membrane includes coating a substrate, such as, for example, an asymmetrical porous hollow fiber substrate, with a solution which includes a perfluorinated polymer and a perfluorinated solvent. Prior to coating, the substrate is impregnated with an impregnation fluid which is immiscible with the perfluorinated solvent. The method of the invention further includes removing the perfluorinated solvent and the impregnation fluid. A composite membrane includes a porous asymmetric hollow fiber substrate having an outer surface coated with a perfluoropolymer coating. Separation devices which include composite membranes and methods of separating a fluid mixture into a fraction enriched in a first component and a fraction depleted in that component also are described.
    Type: Grant
    Filed: February 21, 2003
    Date of Patent: August 2, 2005
    Assignee: L' Air Liquide—Societe Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Joyce Katz Nelson, Benjamin Bikson, James Timothy Macheras
  • Patent number: 6896717
    Abstract: A membrane-based process for separating mixtures of target gases if the gas mixture also contains C3+ hydrocarbon vapors. The process uses gas-separation membranes having a base membrane and a coating layer. The base membrane incorporates a selective layer made from a polymer selective between the light gases to be separated. The coating layer comprises a fluorinated polymer capable of protecting the base membrane from C3+ hydrocarbon vapors and liquids.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: May 24, 2005
    Assignee: Membrane Technology and Research, Inc.
    Inventors: Ingo Pinnau, Zhenjie He, Rolande J. Blanc
  • Patent number: 6860920
    Abstract: Gas separation membranes formed from polyester-polyether block copolymers which are useful for separating gases from gas mixtures. The membranes and processes are especially suited for separating polar gases from mixtures that contain polar and non-polar species. The novel membranes exhibit good permeability and permselectivity as well as durability, making them well suited for industrial applications such as removal of acid gases from natural gas and removal of carbon dioxide from synthesis gas.
    Type: Grant
    Filed: March 13, 2003
    Date of Patent: March 1, 2005
    Assignee: L'Air Liquide-Societe Anoyme a Directoire et Conseil de Surveillance Pour l'Etude et l'Exploitation des Procedes George Claude
    Inventor: John W. Simmons
  • Patent number: 6843829
    Abstract: Gas separation membranes formed from polyether-urethane or polyether-urea block copolymers are useful for separating gases from gas mixtures. The membranes and processes are especially suited for separating polar gases from mixtures that contain polar and non-polar species. The novel membranes exhibit good permeability and permselectivity, as well as durability, making them well suited for industrial applications such as removal of acid gases from natural gas and removal of carbon dioxide from synthesis gas.
    Type: Grant
    Filed: March 13, 2003
    Date of Patent: January 18, 2005
    Assignee: L'Air Liquide-Societe Anonyme a'Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedures Georges Claude
    Inventor: John W. Simmons
  • Patent number: 6814780
    Abstract: A hollow fiber membrane gas separation apparatus of a compact design suitable for separation and purification of gases is disclosed. The apparatus comprises an outer housing that consists of a detachable bowl and a head closure, and a removable hollow fiber membrane cartridge positioned therein. The cartridge contains a concentric tubular inner core member and is surrounded by a shell and at least one end closure. The cartridge is attached by its first axial end in a sealed and removable manner to a gas flow conduit positioned coaxially in the housing closure wherein the conduit is in fluid communication with a gas inlet or product gas outlet port formed in the housing head closure and by its second axial end to a waste gas exit port in the bowl. The feed gas inlet port and the product gas outlet port in the head closure are spaced in a straight line for a short overall distance providing for a linear connection with other components of a gas separation system, which is a preferred system component packaging.
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: November 9, 2004
    Assignee: L'Air Liquide, Societe Anonyme A Directoire et Conseil de Surveillance Pour L'Etude et L'Exploitation des Procedes Georges Claude
    Inventors: Benjamin Bikson, Scott Andrew Bartholomew, Salvatore Giglia, Bradley Quinn Johnson
  • Patent number: 6790262
    Abstract: The present invention is directed to a membrane contactor for debubbling (or degassing) a liguid. The membrane contactor comprises a perforated core tube, a plurality of hollow fiber membranes surrounding the tubes and having an end, a tube sheet affixing the end of the plurality of hollow fiber membranes to the core tube, and a shell surrounding the plurality of hollow fiber membranes and the tube sheet. A lumen side is defined by an internal surface of the membranes. A shell side is defined by the perforated core tube, an external surface of said membrane, and the shell. The membrane is a single layered, skinned, polymethylpentene hollow fiber microporous membrane. The skin is on the shell side.
    Type: Grant
    Filed: February 12, 2003
    Date of Patent: September 14, 2004
    Assignee: Celgard Inc.
    Inventors: Amitava Sengupta, Daniel S. Huntsberger, Brian D. Miller
  • Patent number: 6790263
    Abstract: Soluble polyamic acid salt (PAAS) precursors comprised of tertiary and quaternary amines, ammonium cations, sulfonium cations, or phosphonium cations, are prepared and fabricated into membranes that are subsequently imidized and converted into rigid-rod polyimide articles, such as membranes with desirable gas separation properties. A method of enhancing solubility of PAAS polymers in alcohols is also disclosed.
    Type: Grant
    Filed: September 14, 2000
    Date of Patent: September 14, 2004
    Assignee: Praxair Technology, Inc.
    Inventors: Yong Ding, Benjamin Bikson, Joyce Katz Nelson
  • Patent number: 6755893
    Abstract: In a method for the separation of supercritical gas from substances dissolved in the gas with a membrane through which the gas passes while the substances dissolved in the gas is retained, a pore-free membrane of a polymer perfluoro-2,2-diemthyl-1,3-dioxole is used as a membrane in the separation process.
    Type: Grant
    Filed: December 26, 2002
    Date of Patent: June 29, 2004
    Assignee: Technische Universität Hamburg-Harburg
    Inventors: Klaus-Victor Peinemann, Michael Schossig, Lorenza Sartorelli, Walter Kulcke, Gerd Brunner
  • Patent number: 6723152
    Abstract: A preferred gas separation membrane made from a blend of a copolymer of 2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxole (BDD) and tetrafluoroethylene (TFE) with a 2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxide based polymer is disclosed, the membrane exhibiting an advantageous combination of gas separation and permeation properties for a number of gas separation applications. In particular, the membrane formed from the blend of these polymers exhibits unexpectedly high gas separation factors for separation of volatile organic hydrocarbon vapors (VOC) from air, compared to the component polymers that form the blends. Fabrication of composite membranes formed from perfluoropolymer blends is further disclosed.
    Type: Grant
    Filed: July 1, 2002
    Date of Patent: April 20, 2004
    Assignee: Praxair Technology, Inc.
    Inventors: Benjamin Bikson, Yong Ding, Johann Katz Leroux, Joyce Katz Nelson
  • Patent number: 6716270
    Abstract: The invention relates to preparation and uses of novel polymeric materials, polyimide amic acid salts (PIAAS). The use of these materials for the fabrication of fluid separation membranes is further disclosed.
    Type: Grant
    Filed: January 23, 2003
    Date of Patent: April 6, 2004
    Assignee: Praxair Technology, Inc.
    Inventors: Yong Ding, Benjamin Bikson, Joyce Katz Nelson, James Timothy Macheras
  • Patent number: 6709492
    Abstract: A fuel deoxygenator includes a plurality of fuel plates defining fuel passages through a housing. A permeable membrane supported by a porous substrate is in contact with fuel flowing through the fuel passages. A vacuum in communication with the porous substrate creates a differential pressure between oxygen within the fuel and the porous membrane. The oxygen partial pressure differential causes oxygen dissolved within the fuel to migrate from the fuel through the permeable membrane away from the fuel. Fuel exiting the outlet includes a substantially reduced amount of dissolved oxygen.
    Type: Grant
    Filed: April 4, 2003
    Date of Patent: March 23, 2004
    Assignee: United Technologies Corporation
    Inventors: Louis J. Spadaccini, Steven Lozyniak, He Huang
  • Patent number: 6709491
    Abstract: The object of the present invention is to provide a novel gas separation membrane having a high gas permeability and a high gas selectivity, and a method of producing the same. The present invention provides a gas separation membrane comprising a polymeric material soluble in an organic solvent, wherein at least a part of the surface is modified by ion bombardment.
    Type: Grant
    Filed: August 26, 2002
    Date of Patent: March 23, 2004
    Assignee: Riken
    Inventors: Hiroyoshi Kawakami, Shoji Nagaoka, Yoshiaki Suzuki, Masaya Iwaki
  • Patent number: 6663805
    Abstract: Isopycnic or asymmetric mixed matrix hollow fiber membranes for gas separation can be made by a continuous spinning process. Mixed matrix membranes are characterized by a continuous phase of selectively gas permeable polymer in which are uniformly dispersed discrete absorbent particles such as molecular sieves that also have selectivity enhancing properties. The fibers can be monolithic in which the fiber wall is entirely mixed matrix, or composite in which an active mixed matrix layer is positioned adjacent to a supporting substrate layer. The novel mixed matrix hollow fiber membranes provide higher selectivity than dense film membranes of the continuous phase polymer.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: December 16, 2003
    Assignee: L'Air Liquide Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Okan Max Ekiner, Sudhir S. Kulkarni
  • Patent number: 6660062
    Abstract: A process is provided for chemically modifying a dual-layer hollow fibre, wherein the fibre comprises a first layer consisting essentially of a polyimide and a second layer consisting essentially of a polymer which is substantially unaffected by the chemical modification process. The process comprises contacting the polyimide layer with a polyamine. In addition, a process is provided for chemically modifying a polyimide membrane in general, using a process which comprises contacting the membrane with an alcoholic solution of an aliphatic-aromatic polyamine.
    Type: Grant
    Filed: May 9, 2002
    Date of Patent: December 9, 2003
    Assignee: Institute of Materials Research and Engineering
    Inventors: Ye Liu, Dong-Fei Li, Rong Wang, Tai-Shung Chung
  • Patent number: 6613131
    Abstract: A gas-liquid separation membrane is provided with high reliability and performance while having gas-permeable pores formed independently of each other in even pore size and in uniform distribution. The gas-liquid separation membrane has a plurality of gas-permeable pores that permit permeation of gas and that prevent permeation of liquid by capillary force, and the plurality of gas-permeable pores are formed independently of each other and in even pore size by laser machining.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: September 2, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshihiko Ujita, Junji Shimoda, Akira Tsujimoto, Yasuo Kotaki, Kiyomitsu Kudo
  • Patent number: 6602415
    Abstract: A polymeric composite may be used for forming fluid separation membranes. The fluid separation membranes may go through a separation selectivity maximum as a function of operating conditions (e.g., temperature and/or pressure). The membranes may be formed from polyamide or poly (pyrrolone-imide). Polyamides may be formed by the condensation of a tetraamine, a tetraacid, and a diamine. Poly (pyrrolone-imides) may be formed by the condensation of a polyamide.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: August 5, 2003
    Assignee: Board of Regents, The University of Texas
    Inventors: William J. Koros, Ryan L. Burns
  • Patent number: 6579342
    Abstract: Oleophobic and hydrophobic filters for filter venting applications are made by forming a fluorosulfone coating on the surface of a filtration substrate. The filters have high water penetration pressures and high air permeabilities. The coatings are formed by grafting a fluorosulfone oligomer to a polymeric substrate.
    Type: Grant
    Filed: February 7, 2001
    Date of Patent: June 17, 2003
    Assignee: Pall Corporation
    Inventors: I-fan Wang, Jeff Palpallatoc
  • Patent number: 6544316
    Abstract: A process for separating hydrogen from a multicomponent gas mixture containing hydrogen and a hydrocarbon, using gas-separation membranes selective for hydrogen over the hydrocarbon. The membranes use a selective layer made from a polymer having repeating units of a fluorinated polymer, and demonstrate good resistance to plasticization by the organic components in the gas mixture under treatment, and good recovery after exposure to liquid aromatic hydrocarbons.
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: April 8, 2003
    Assignee: Membrane Technology and Research, Inc.
    Inventors: Richard W. Baker, Ingo Pinnau, Zhenjie He, Karl D. Amo, Andre R. Da Costa, Ramin Daniels
  • Patent number: 6540813
    Abstract: A method for fabricating a composite membrane includes coating a substrate, such as, for example, an asymmetrical porous hollow fiber substrate, with a solution which includes a perfluorinated polymer and a perfluorinated solvent. Prior to coating, the substrate is impregnated with an impregnation fluid which is immiscible with the perfluorinated solvent. The method of the invention further includes removing the perfluorinated solvent and the impregnation fluid. A composite membrane includes a porous asymmetric hollow fiber substrate having an outer surface coated with a perfluoropolymer coating. Separation devices which include composite membranes and methods of separating a fluid mixture into a fraction enriched in a first component and a fraction depleted in that component also are described.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: April 1, 2003
    Assignee: Praxair Technology, Inc.
    Inventors: Joyce Katz Nelson, Benjamin Bikson, James Timothy Macheras