Ring Containing Organic Compound Patents (Class 96/13)
  • Patent number: 6521025
    Abstract: A hollow fibre membrane has an active layer (2) in which elongate polymer molecules (3) are longitudinally aligned essentially parallel to the extrusion direction to thereby define a plurality of spaced free volume cavities (4) which are particularly numerous and are essentially regularly spaced to provide enhanced selectivity when used in gas separation. The hollow fibre membrane is manufactured using a dry/wet phase separation process by spinning a dope composition which is extruded through a spinneret (12) having an annulus or annular orifice (16) together with a bore-forming fluid or coagulant. The dope composition has a power law index of less than 1 (unity) and the bore coagulant has a water activity of less than 1 (unity).
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: February 18, 2003
    Assignee: University of Strathclyde
    Inventors: Simon James Shilton, Ahmad Fauzi Ismail
  • Patent number: 6497747
    Abstract: A process for preparing polyimide gas separation membranes is disclosed. The process involves preparing polyamic acid salt membrane precursors that are converted into polyimide membranes by mild thermal or chemical treatments. The gas separation processes that utilize these polyimide membranes are further disclosed.
    Type: Grant
    Filed: September 24, 1999
    Date of Patent: December 24, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Yong Ding, Benjamin Bikson, Joyce Katz Nelson
  • Patent number: 6485545
    Abstract: In an arrangement for removing water vapor from pressurized gases or gas mixtures, particularly from air, a membrane separating apparatus is provided wherein the gas-vapor stream is separated into a vapor-enriched permeate stream and a vapor-depleted retentate stream and the vapor enriched permeate stream is conducted to a vacuum pumping device for generating at the permeate side of the membrane separating apparatus a vacuum providing for a predetermined trans-membrane pressure ratio.
    Type: Grant
    Filed: January 31, 2000
    Date of Patent: November 26, 2002
    Assignee: GKSS-Forschungszentrum Geesthacht GmbH
    Inventors: Klaus Ohlrogge, Volker Nitsche, Jan Wind
  • Patent number: 6478852
    Abstract: A membrane separation process and apparatus for carrying out the process involves contacting a gas feed mixture with one side of a selectively gas permeable membrane and allowing the components to pass through the membrane to form a permeate composition in contact with the opposite side of the membrane and leave a retentate composition on the feed side of the membrane. The process includes introducing a sweep flow of feed gas into the permeate composition near the membrane at a rate effective to increase the enrichment of the retentate composition in the less preferentially permeable component of the feed mixture to a concentration much greater than is achieved without the sweep flow. This process is especially well suited to improve single stage membrane separation effectiveness so that the need for conventional multistage separations to achieve moderate to high purity retentate compositions can be obviated.
    Type: Grant
    Filed: February 18, 2000
    Date of Patent: November 12, 2002
    Assignee: CMS Technology Holdings, Inc.
    Inventors: Kevin Patrick Callaghan, Stuart Marshall Nemser
  • Patent number: 6468331
    Abstract: A solid state facilitated transport separation membrane prepared by forming a polymer electrolyte layer consisting of a polymer and a metal salt to a porous membrane having good permeance and mechanical strength; the polymer electrolyte facilitated transport separation membrane thus prepared is characterized in that the permeance and selectivity to alkene hydrocarbons is high, and that the complex is formed by a polymer ligand and a metal in the polymer electrolyte maintains its activity as a carrier of alkene even under dry operation.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: October 22, 2002
    Assignee: Korea Institute of Science and Technology
    Inventors: Yong-Soo Kang, Jong-Ok Won, Seong-Uk Hong
  • Patent number: 6425944
    Abstract: The invention relates to sulphonated polyimides, notably of formula (I) The invention also relates to an ion exchange membrane that includes such a polyimide and a fuel cell that includes such a membrane. The membranes of the invention have excellent durability and low cost and the fuel cells can be used, in particular, in electric vehicles.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: July 30, 2002
    Assignees: Commissriat a l'Energie Atomique, Centr National de la Recherche Scientifique
    Inventors: Sylvain Faure, Michel Pineri, Pierre Aldebert, RĂ©gis Mercier, Bernard Sillion
  • Patent number: 6419725
    Abstract: The process is characterised by sulfonating a partially brominated poly(phenylene oxide). The gas separation material so formed may be made into a membrane and is useful in separating component gases from a gas mixture.
    Type: Grant
    Filed: August 15, 2000
    Date of Patent: July 16, 2002
    Assignee: Lattice Intellectual Property Ltd.
    Inventors: Brendan William Laverty, Geta Chowdhury, Ranka Vujosevic, Shengzhi Deng, Boping Yao, Takeshi Matsuura
  • Patent number: 6409787
    Abstract: A filter element comprises a substrate constructed from at least two different materials. A first one of the materials has a first temperature at which the first material activates. A second one of the materials is at least a partially crystalline structure and has a second temperature which is lower than the first temperature at which the second material activates. A porous membrane is supported by the substrate. An attachment is between the substrate and the membrane. The attachment results from the second material of the substrate activated at a temperature less than the first temperature to engage portions of the membrane at spaced apart locations and fix together the membrane and the substrate upon the second material cooled to a temperature less than the second temperature.
    Type: Grant
    Filed: June 22, 2000
    Date of Patent: June 25, 2002
    Assignee: BHA Technologies, Inc.
    Inventors: Alan Smithies, Vikas Madhusudan Nadkarni
  • Patent number: 6406517
    Abstract: The separation factor with respect to a gas binary of a selectively gas permeable membrane of a fluoropolymer can be increased by fabricating the membrane from a composition of a blend of the fluoropolymer with a nonfugitive, nonpolymeric fluorinated adjuvant. The composition can be made by dissolving the adjuvant and the polymer in a suitably compatible solvent then forming the membrane from the solution for example by casting, dipping, or spraying the solution on a substrate and devolatilizing the solvent. The extent of the selectivity increase varies widely with the combination of fluoropolymer and adjuvant and largely increases in direct relation with the proportion of adjuvant in the membrane composition.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: June 18, 2002
    Assignee: CMS Technology Holdings, Inc.
    Inventors: Daniel Lee Avery, Purushottam V. Shanbhag
  • Patent number: 6383265
    Abstract: Improved polymer blends, and polymer blend membranes having improved mechanical properties are provided by alteration of the critical solution temperature of the polymer blend spinning solution through the incorporation of organic or inorganic complexing agents.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: May 7, 2002
    Assignee: L'Air Liquide Societe Anonyme A Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Okan Max Ekiner
  • Patent number: 6368382
    Abstract: The invention relates to a method of making an epoxysilicone coated membrane by coating a porous asymmetric membrane layer with a UV-curable controlled release epoxysilicone coating. A mixture of the epoxysilicone resin and an onium photocatalyst are applied to the porous asymmetric membrane layer in a dilute non-polar solution and cured by UV or electron beam radiation to produce a dry epoxysilicone coated membrane. The porous asymmetric membrane layer is comprised of an asymmetric cellulosic membrane or an asymmetric polymer membrane with a low selectivity. The epoxysilicone coating was found to provide the asymmetric membrane layer with improved selectivity which extends to separation temperatures below 70° C. and provides stable flux rates. Membranes produced in this manner are useful for the separation of gases such as carbon dioxide from natural gas.
    Type: Grant
    Filed: July 27, 2000
    Date of Patent: April 9, 2002
    Assignee: UOP LLC
    Inventor: Jeffrey J. Chiou
  • Patent number: 6364924
    Abstract: The present invention provides a compact and inexpensive air-permeable cap and an outdoor lamp, automobile lamp and automobile electrical component including such an air-permeable cap. A novel air-permeable cap is provided including a closed-end cylindrical cover member, a substantially cylindrical body fitted in the closed-end cylindrical cover member, and an air passage formed between the inner wall of the closed-end cylindrical cover member and the outer wall of the substantially cylindrical body and between the bottom surface of the closed-end cylindrical cover member and the lower end of the substantially cylindrical body, wherein the mounting portion at which the air-permeable cap is mounted on the mounting opening of the housing is formed at the top of the substantially cylindrical body.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: April 2, 2002
    Assignee: Nitto Denko Corporation
    Inventors: Hiroaki Mashiko, Hiroyuki Nishii, Norikane Nabata
  • Patent number: 6332914
    Abstract: The present invention is a bi-thermal membrane process for separating and recovering hydrogen isotopes from a fluid containing hydrogen isotopes, such as water and hydrogen gas. The process in accordance with the present invention provides counter-current cold and hot streams of the fluid separated with a thermally insulating and chemically transparent proton exchange membrane (PEM). The two streams exchange hydrogen isotopes through the membrane: the heavier isotopes migrate into the cold stream, while the lighter isotopes migrate into the hot stream. The heavy and light isotopes are continuously withdrawn from the cold and hot streams respectively.
    Type: Grant
    Filed: February 28, 2000
    Date of Patent: December 25, 2001
    Assignee: The United States of America as represented by the Department of Energy
    Inventor: Myung W. Lee
  • Patent number: 6302934
    Abstract: A filter medium for filters wherein the evolution of organic gases and dusting from a reinforcing member are depressed and thus the excellent characteristics inherent to a porous polytetrafluoroethylene membrane as a collection layer are fully achieved. The filter medium (1) for filters comprises a porous polytetrafluoroethylene membrane (2) and a porous ultrahigh-molecular weight polyolefin membrane (3) as a reinforcing member for the filter medium.
    Type: Grant
    Filed: November 9, 1999
    Date of Patent: October 16, 2001
    Assignee: Nitto Denko Corporation
    Inventors: Norikane Nabata, Yozo Nagai, Eizo Kawano, Takuya Maeoka
  • Patent number: 6258154
    Abstract: An apparatus for degassing liquids comprises a cavity through which liquid is conducted, with gas being removed from the liquid through at least one of the limiting faces of the cavity by providing on the side of the face distal to the cavity a smaller pressure than within the cavity. The apparatus is characterized in that the limiting face between the cavity and the region having reduced pressure compared to the cavity is formed by at least one thin membrane, having a thickness of less than about 10 micrometers, and in that a porous support structure for supporting the membrane is provided. The degasser can be miniaturized and integrated into a liquid chromatograph.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: July 10, 2001
    Assignee: Hewlett-Packard Company
    Inventors: Manfred Berndt, Werner Karl Schomburg, Zeno Rummler, Ralf-Peter Peters, Mario Hempel
  • Patent number: 6187157
    Abstract: A multi-phase solid electrolyte ion transport membrane comprising at least two phases wherein one of the phases comprises an oxygen ion single conductive material, or a mixed conductor. The other phase comprises an electronically-conductive metal or metal oxide that is incorporated into the membrane by deposition of the metal or metal oxide from a polymer made by polymerizing a chelated metal dispersion in a polymerizable organic monomer or prepolymer. The multi-phase composition advantageously comprises a first phase of a ceramic material and a second phase of a metal or metal oxide bound to a surface of the ceramic material. The multi-phase composition is advantageously prepared in an in-situ fashion before fabricating the membrane matrix. As another alternative, a preformed ceramic matrix is surface-coated with a metal or metal oxide.
    Type: Grant
    Filed: February 2, 1999
    Date of Patent: February 13, 2001
    Assignee: Praxair Technology, Inc.
    Inventors: Chieh-Cheng Chen, Ravi Prasad
  • Patent number: 6168648
    Abstract: A spiral wound type membrane element is formed by superposing gas-liquid contact membranes on both surfaces of a first fluid passage forming member, superposing a second fluid passage forming member on the surface of one of the gas-liquid contact membranes and spirally winding the gas-liquid contact membranes around a second fluid supply pipe along with the first fluid passage forming member and the second fluid passage forming member. A side portion on the inner peripheral side and a side portion on the outer peripheral side of a first fluid passage formed by the first fluid passage forming member between the gas-liquid contact membranes are sealed. Both end portions of a second fluid passage formed by the second fluid passage forming member between the gas-liquid contact membranes are sealed. The spiral wound type membrane element is stored inside a cylindrical container. The gas-liquid contact membranes are formed by PTFE (polytetrafluoroethylene) porous membranes having hydrophobicity.
    Type: Grant
    Filed: August 25, 1999
    Date of Patent: January 2, 2001
    Assignee: Nitto Denko Corporation
    Inventors: Akira Ootani, Hideki Hayama, Yoshihiko Kondou
  • Patent number: 6143058
    Abstract: An adsorbent filter including compression molded particulate adsorbent construction is provided. The compression molded particulate adsorbent construction contains a particulate adsorbent and a sufficient amount of binder to retain the particulate adsorbent in a non-free flowing form. The adsorbent filter preferably includes a compression molded particulate adsorbent construction as described, positioned within an outer, porous cover. Preferably the outer, porous cover includes expanded porous polytetrafluoroethylene. In certain preferred applications, the adsorbent filter is positioned within a housing defining an internal volume and including therein electronic component(s), such that the adsorbent filter protects the internal volume of the housing, and components therein, from damage. The typical application is as a disk drive adsorbent filter. A preferred method for preparing an adsorbent filter according to the present invention is provided.
    Type: Grant
    Filed: December 9, 1998
    Date of Patent: November 7, 2000
    Assignee: Donaldson Company, Inc.
    Inventors: Andrew Christian Dahlgren, Robert Murray Rogers
  • Patent number: 6126721
    Abstract: A portable breathing air supply apparatus uses a membrane separation module to obtain oxygen enriched air from ambient air which is blown into the module by an electrically powered fan. Oxygen enriched air is withdrawn from the permeate side of the membrane by a vacuum pump and is stored in a reservoir while the user exhales. In a preferred mode, a conserver valve in a tube leading from the reservoir to the user's mouth or nose is triggered to feed the enriched air for a preselected duration after a sensor in the tube detects onset of inhalation. Power for the electrical components can be supplied by batteries. The portable apparatus is sufficiently compact and light to be transported by persons weakened by certain chronic breathing disorders, such as chronic obstructive pulmonary disease and emphysema, and thus frees the user to roam for long periods away from a primary source of oxygen.
    Type: Grant
    Filed: November 16, 1998
    Date of Patent: October 3, 2000
    Assignee: Compact Membrane Systems, Inc.
    Inventors: Stuart Marshall Nemser, Louis Himelreich
  • Patent number: 6110249
    Abstract: A filter element is adapted to be located in a gas stream. The filter element comprises a substrate having a structure selected from the group consisting of scrimed needled felt, scrimless needled felt, woven fabric and mesh. The substrate comprises at least two different materials. A first one of the materials has a first melting temperature. A second one of the materials has a second melting temperature lower than the first melting temperature. An expanded polytetrafluoroethylene filtering membrane is adapted to be located upstream relative to the substrate in the gas stream and supported by the substrate. The substrate is attached to the filtering membrane by the second material of the substrate melted to engage the membrane and fix the membrane to the substrate.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: August 29, 2000
    Assignee: BHA Technologies, Inc.
    Inventors: Bradley Duane Medcalf, James Roy Doehla, Anthony Joseph Thill, Vikas Madhusudan Nadkarni
  • Patent number: 6063153
    Abstract: Watertight sealed type electric motor 10, with a clearance between a core wire and a cover 24 of a lead wire 20, which is a vent path between the interior of the motor 10 and the outside, which clearance is covered a vent filter 28, which permits only gas to pass therethrough, and is attached to the lead wire 20 so as to cover an opening end portion of the cover 24.
    Type: Grant
    Filed: August 12, 1998
    Date of Patent: May 16, 2000
    Assignee: Showa Corporation
    Inventor: Shigeru Kai
  • Patent number: 6059862
    Abstract: This invention relates to a miniaturizable separation module (dehumidifier, humidifier) utilizing the gas separation property of waterproof membranes having fine moisture-permeable through holes. The separation module according to the invention comprises: a cylindrical casing 10 installed at the wall of a moisture-proof and drip-proof box 4, so as to form a gas passage communicating the inside and the outside of the box; a plurality of waterproof membranes 1, 2, 3, having fine moisture-permeable through holes, disposed in the cylindrical casing at intervals of spacing, so as to form chambers 5, 6 in the gas passage; and conductive porous structures disposed in proximity of the waterproof membranes. The longitudinal section of the solid portion around the holes of the conductive porous structure is formed into an essentially egg-like shape, and the acute angle side of the egg-like longitudinal sectional shape is disposed so as to direct to the waterproof membrane.
    Type: Grant
    Filed: June 26, 1998
    Date of Patent: May 9, 2000
    Inventors: Kunitaka Mizobe, Shohei Kato
  • Patent number: 6030428
    Abstract: A fine powder of polytetrafluoroethylene is mixed with a liquid lubricant, and the mixture is molded into an unsintered sheet by at least one of an extrusion method and a rolling method. The liquid lubricant is removed from the sheet by at least one of a heating method and an extrusion method. This sheet-form molding is stretched in the machine direction to produce a sheet-form polytetrafluoroethylene molding which, upon analysis with a differential scanning calorimeter, gives a crystal fusion curve having an endothermic peak in the temperature range of 345.+-.5.degree. C. and which has a degree of crystallization of from 0.1 to 0.85 and a specific gravity of 1.4 or lower. The molding is then stretched in the transverse direction to produce a porous polytetrafluoroethylene (PTFE) membrane. The process is effective in producing, with good reproducibility, a useful porous PTFE membrane which has a high collection efficiency and a low pressure loss and is reduced in the leakage of coarse particles.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: February 29, 2000
    Assignee: Nitto Denko Corporation
    Inventors: Toshiaki Ishino, Norikane Nabata, Takuya Maeoka
  • Patent number: 5972080
    Abstract: Separation membranes excellent in strength, durability, heat resistance and solvent resistance as well as in balance between substance separation properties and substance permeability are disclosed, which are formed from polyhydrazidoimide resins, and preferably comprises a non-porous dense layer formed from a polyhydrazidoimide resin obtained from the reaction of an aromatic tetracarboxylic dianhydride such as 4,4'-(hexafluoroisopropylidene)diphthalic anhydride and an aromatic dihydrazide such as isophthalic dihydrazide as essential components.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: October 26, 1999
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventor: Yoshitomo Nagata
  • Patent number: 5969087
    Abstract: A novel polyimide having a repeating structure unit expressed by the following general formula (1), a method for manufacturing the same, a gas separation membrane using the novel polyimide and the method for manufacturing the same. The gas separation membrane using this polyimide is excellent in gas permeable performance and separation selectivity for gas, for example, carbon dioxide, methane, etc.General Formula (1) ##STR1## where R denotes a quadrivalent organic group.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: October 19, 1999
    Assignee: Nitto Denko Corporation
    Inventor: Masatoshi Maeda
  • Patent number: 5928409
    Abstract: In one aspect, a method for selectively removing at least one target component from a multicomponent feed fluid using a removal system, the system including a feed chamber having an inlet and an outlet, a permeate chamber, and a membrane for separating the feed and permeate chambers. The membrane is selective for the at least one target component.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: July 27, 1999
    Assignee: New Jersey Institute of Technology
    Inventor: Kamalesh K. Sirkar
  • Patent number: 5928410
    Abstract: A supported gas separation membrane for separating a particular component from a mixture of gases, a process for its manufacture and the use of the membrane in the separation of gases are provided in which the supported gas separation membrane comprises (a) a porous polymeric support layer and (b) an asymmetric gas separation membrane layer formed from a polyimide having repeating units of the general formula: ##STR1## wherein R is: ##STR2## and x is an integer.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: July 27, 1999
    Assignee: Texaco Inc.
    Inventors: Yajnanarayana H. R. Jois, John Reale, Jr.
  • Patent number: 5917137
    Abstract: The invention provides for gas separation membranes with superior gas transport properties made from certain two- and three-component blends of polyethersulfone with aromatic polyimides, to provide a gas separation membrane with superior productivity and good selectivity.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: June 29, 1999
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Okan Max Ekiner
  • Patent number: 5914415
    Abstract: Disclosed are a first vent filter member which includes: an elastomer member made of a thermoplastic elastomer to which a water-repellent film can be fixed by fusion and having a cylindrical form whose one end part serves as an opening for insertion of a mounting part of a base; a water-repellent film thermally fusion-bonded to the other end part of the elastomer member; and a covering cap which protects the water-repellent film and has been fitted and fixed to the elastomer member in such a manner that a vent passageway is formed between the elastomer member and the covering cap, and a second vent filter member which includes: an elastomer member made of a thermoplastic elastomer to which a water-repellent film can be fixed by fusion and having a disk form which has on one side thereof a tapered insertional part to be inserted into a mounting part, is blocked on the other side with a mist barrier cover, and has a sealing/fixing part on the outer periphery thereof and a vent passageway extending from said one
    Type: Grant
    Filed: August 8, 1997
    Date of Patent: June 22, 1999
    Assignee: Nitto Denko Corporation
    Inventor: Takashi Tago
  • Patent number: 5888275
    Abstract: A deaeration assembly for removal of air or other gases dissolved in a liquid. The assembly includes a deaeration element having a gas-channel-forming component enclosed and sealed within an envelope which includes a nonporous fluoropolymer film. The assembly also includes a liquid-channel-forming component which can be positioned on the outside of the element, or can be enclosed with the gas-channel-forming component within the element. The assembly can be formed in spiral-wound or folded configurations for installation in a deaeration module or apparatus. The deaeration assembly is useful for removal of gases dissolved in chemically aggressive liquids, high-purity liquids, and other special liquids.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: March 30, 1999
    Assignee: Japan Gore-Tex, Inc.
    Inventors: Sadakatsu Hamasaki, Masayuki Kobayashi, Takushi Yokota, Kanako Kobashi
  • Patent number: 5882382
    Abstract: A polyimide resin semipermeable membrane has a continuous structure of a homogeneous skin layer part having an average thickness of 5-1000 nm and a porous layer that is made of the same materials and has the same thickness as the skin layer. The porous layer is formed by the void structure having the average hole diameter of less than 3 .mu.m so that a gas separation membrane can be provided, having high permeability and satisfying cost efficiency requirements can be provided. The above-mentioned membrane is formed by the following steps: a solution is made by adding diethylene glycol dimethyl ether into polyimide; the obtained solution is left for deaeration and adjusted; the film-forming solution is cast on a polyester nonwoven cloth, which serves as a supporting layer, with an applicator; the solution is soaked in water as a solidifying solution for 5 minutes and in a water. Thus semipermeable membrane comprising the homogeneous skin layer part and the porous layer.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: March 16, 1999
    Assignee: Nitto Denko Corporation
    Inventors: Hisao Hachisuka, Kenichi Ikeda
  • Patent number: 5876487
    Abstract: An adsorbent filter including compression molded particulate adsorbent construction is provided. The compression molded particulate adsorbent construction contains a particulate adsorbent and a sufficient amount of binder to retain the particulate adsorbent in a non-free flowing form. The adsorbent filter preferably includes a compression molded particulate adsorbent construction as described, positioned within an outer, porous cover. Preferably the outer, porous cover includes expanded porous polytetrafluoroethylene. In certain preferred applications, the adsorbent filter is positioned within a housing defining an internal volume and including therein electronic component(s), such that the adsorbent filter protects the internal volume of the housing, and components therein, from damage. The typical application is as a disk drive adsorbent filter. A preferred method for preparing an adsorbent filter according to the present invention is provided.
    Type: Grant
    Filed: March 17, 1997
    Date of Patent: March 2, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: Andrew Christian Dahlgren, Robert Murray Rogers
  • Patent number: 5837032
    Abstract: This invention relates to a method of an apparatus and method for separating component gases in a gas mixture employing a glassy polymer membrane at temperatures at or slightly above the freezing point of any liquid present so as to achieve superior separator of gas components. The composition of certain monomers and polymers are claimed.
    Type: Grant
    Filed: February 10, 1995
    Date of Patent: November 17, 1998
    Assignee: The Cynara Company
    Inventors: David J. Moll, Alan F. Burmester, Thomas C. Young, Kent B. McReynolds, James E. Clark, Charles Z. Hotz, Ritchie A. Wessling, George J. Quarderer, Ronald M. Lacher, Thomas O. Jeanes, Henry N. Beck, Stephen E. Bales, Bethanne L. Smith
  • Patent number: 5830261
    Abstract: A deaeration assembly for removal of air or other gases dissolved in a liquid. The assembly includes a deaeration element having a gas-channel-forming component enclosed and sealed within an envelope formed of a non-porous fluoropolymer film. The assembly also includes a liquid-channel-forming component which can be positioned on the outside of the element, or can be enclosed with the gas-channel-forming component within the element. The assembly can be formed in spiral-wound or folded configurations for installation in a deaeration module or apparatus. The deaeration assembly is useful for removal of gases dissolved in chemically aggressive liquids, high-purity liquids, and other special liquids.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: November 3, 1998
    Assignee: Japan Gore-Tex, Inc.
    Inventors: Sadakatsu Hamasaki, Masayuki Kobayashi
  • Patent number: 5820992
    Abstract: The present invention provides a process for preparing membranes using novel silicon containing polyarylates of Formula I ##STR1## where R.sub.1 to R.sub.8 represent hydrogen, alkyl groups containing 1 to 5 methylene group or halogen atoms, R.sub.9 and R.sub.10 represents alkyl groups containing 1 to 5 carbon atoms or CF.sub.3 group and R.sub.11 and R.sub.12 represent alkyl groups with 1 to 5 carbon atoms or phenyl groups.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: October 13, 1998
    Assignee: National Chemical Laboratory
    Inventors: Arun Savalaram Jadhav, Jayarani Purushotham, Sudhir Sharad Chandra Kulkarni, Subhash Pundlik Vernekar
  • Patent number: 5820659
    Abstract: Gas separation membranes having enhanced selectivity for a mixture of gases is disclosed. The membranes may be asymmetric or multicomponent. The membranes surprisingly provide selectivity for gases in a mixture that approaches the relative selectivity of the single gas components. Preferably the membrane provides selectivity for a mixture of gases which is at least 65%, preferably 80%, of the relative selectivity of the corresponding single gases. A process for making improved gas separation membranes is also disclosed.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: October 13, 1998
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude Et, L'Exploitation des Procedes Georges Claude
    Inventors: Okan Max Ekiner, Gregory Kendall Fleming
  • Patent number: 5817165
    Abstract: A fluorine-containing polyimide gas separation membrane which is pinhole-free, uniform over a large area, and has a high permeability and a high separation factor .alpha. is provided. A polyimide resin is dissolved in at least one solvent selected from the group consisting of an organic solvent (A) or (B). The organic solvent (A) has a dielectric constant of 30 or less and a dipole moment of 3.0 D or less. The organic solvent (B) mainly contains an organic solvent having at least one ether bonding in the molecular unit. In the next step, the polyimide resin is dipped in a solvent (C) in order for desolvation. The solvent (C) does not dissolve the fluorine-containing polyimide resin while it is miscible with the organic solvent (A) or (B). As a result, an asymmetric gas separation membrane is formed. The fluorine-containing polyimide resin layer comprises a skin layer the thickness L.sub.1 thereof is about 40 nm and a sponge like layer the thickness L.sub.2 thereof is about 30 .mu.m.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: October 6, 1998
    Assignee: Nitto Denko Corporation
    Inventors: Hisao Hachisuka, Masatoshi Maeda, Kenichi Ikeda
  • Patent number: 5753009
    Abstract: A device and method for selectively removing one or more components from a multicomponent gas/vapor mixture by membrane fractionation. The membrane fractionation gas removal system preferably comprises: a feed chamber which contains the gas/vapor mixture; at least one porous membrane having a first side which contacts the gas/vapor mixture in the feed chamber, and a second side; at least one nonporous membrane having a first side which contacts the second side of the at least one porous membrane, and a second side, the nonporous membrane having a permeability selective to one or more components; an exit chamber connected to the second side of the at least one nonporous membrane such that the component exiting the nonporous gas enters the exit chamber; and an evacuation member connected to the exit chamber for evacuating one or more components from within the exit chamber.
    Type: Grant
    Filed: May 14, 1996
    Date of Patent: May 19, 1998
    Assignee: New Jersey Institute of Technology
    Inventors: Kamalesh K. Sirkar, Jyh-Yao Raphael Li
  • Patent number: 5753014
    Abstract: A membrane filter comprises a membrane provided with pores with a pore size between 5 nm and 50 .mu.m. The membrane may easily and reliably be processed with use of silicon micromachining through depositing a relatively thin membrane layer on a support, by use of a suitable vapour deposition or spincoating technique, after which perforations are made in the thin membrane layer, for example by etching with aid of photo-lithography or an imprint technique. Such a membrane is very well applicable for the separation of biological cells. A membrane with a thickness smaller than the diameter of the perforations is in particular suited for the separation of vulnerable cells and may be used as a leucocyte filter or as a blood plasma separator of blood concentrates. A microfiltration membrane according to the invention may very well be applied as a support for the deposition of a separation layer for ultrafiltration, gas separation or catalysis.
    Type: Grant
    Filed: May 10, 1996
    Date of Patent: May 19, 1998
    Inventor: Cornelis Johannes Maria Van Rijn
  • Patent number: 5749942
    Abstract: An apparatus (10) and a method are described for extracting gas from a liquid containing dissolved gas. The liquid is pumped from an external reservoir (40) of the liquid into a separation cell (14) by a liquid-pumping chamber (11). In separation cell (14) a permselective membrane (17) effects extraction of the dissolved gas from the liquid. A gas-pumping chamber (23) pumps the extracted gas from the permeate chamber (16) of the separation cell (14) to a collection station (27), where the extracted gas can be analyzed, separated into its individual components, or stored, as desired.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: May 12, 1998
    Assignee: Raychem Corporation
    Inventors: John Seymour Mattis, David C. Bliven
  • Patent number: 5725633
    Abstract: Novel polyimide gas separation membranes and the process of using such membranes to separate gases are disclosed. The polyimides are formed from rigid aromatic dianhydrides and aromatic diamines that contain sulfonic acid, salified sulfonic acid, or sulfonic ester groups. Methods of preparing improved composite gas separation membranes from the sulfonated polyimides of this invention are disclosed.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: March 10, 1998
    Assignee: Praxair Technology, Inc.
    Inventors: Yurdagul F. Ozcayir, Gertrud Goetz, Benjamin Bikson
  • Patent number: 5716430
    Abstract: Useful gas separation membranes made from aromatic polyimides which comprise pendant nitro groups incorporated onto the phenyl backbone of the polymer. These polymers may be synthesized by the aryl nitration of the unsubstituted polyimides, or from the condensation reaction of aromatic diamines containing pendant nitro groups with aromatic dianhydrides, and are particularly useful in air separation.
    Type: Grant
    Filed: May 3, 1996
    Date of Patent: February 10, 1998
    Assignee: L'Air Liquide Societe Anonyme Pour l'Etude et, l'Exploitation des Procedes Georges Claude
    Inventor: John Warren Simmons
  • Patent number: 5702503
    Abstract: A composite membrane made of an asymmetric porous support and an ultrathin layer having a thickness of less than 100 nm is provided. A method of making the membrane and method for carrying out gas separations using the membrane are also provided.
    Type: Grant
    Filed: December 25, 1995
    Date of Patent: December 30, 1997
    Assignee: UOP
    Inventor: Man-Wing Tse Tang
  • Patent number: 5665146
    Abstract: A dehumidifier used to remove moisture from a sealed container by isolating a ventilation passage, which is provided in the sealed container, in a plurality of stages by water-vapor permeable waterproof films so that the interior of the ventilation passage has a gradient of density of vapor, and moves the vapor particles from the interior of the container toward the outside air. A structure provided with a cylindrical member fixed to a wall of a box and forming a ventilation passage allowing communication between the interior and exterior of the box, and a bottomed multiplex cylindrical ventilation member. The walls of the ventilation member are formed by first and second waterproof films having minute water-vapor permeable through holes. The bottomed cylindrical ventilation member being provided in the cylindrical member, whereby the ventilation passage is isolated in three stages from the inner portion of the container toward the outer portion thereof.
    Type: Grant
    Filed: January 3, 1996
    Date of Patent: September 9, 1997
    Inventor: Kunitaka Mizobe
  • Patent number: 5647894
    Abstract: A gas separating composite membrane comprising two types of polyimide resin layers having different molecular structures and each having solubility in an organic solvent different from each other, the two layers being laminated being substantially independent or via a mixed layer, the first polyimide resin layer comprising a porous polyimide supporting membrane having a nitrogen gas permeation flux density at 25.degree. C. of at least 2 Nm.sup.3 /m.sup.2 /h/atm., and the second polyimide resin layer, which contributes to a gas separating performance comprising a fluorine-containing polyimide thin film containing at least three fluorine atoms in a repeating molecular structure unit which constructs the second polyimide resin layer has a very high gas permeation flux density while maintaining a high gas permeability, excels in heat resistance and chemical resistance, and satisfies a practical use in terms of cost.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: July 15, 1997
    Assignee: Nitto Denko Corporation
    Inventors: Tomomi Ohara, Hisao Hachisuka, Ping Xu, Akira Shimazu, Kenichi Ikeda
  • Patent number: 5611843
    Abstract: The present invention is directed toward a composition suitable for use in separating CO.sub.2 from gas streams containing CO.sub.2 especially H.sub.2 rich gas streams containing CO.sub.2 and CO. The composition comprises a hydrophylic polymer and at least one salt of an aminoacid, the salt of the aminoacid being present in an amount ranging from about 10 to about 80 wt % based on the total weight of the composition.
    Type: Grant
    Filed: July 7, 1995
    Date of Patent: March 18, 1997
    Assignee: Exxon Research and Engineering Company
    Inventor: W. S. Winston Ho
  • Patent number: 5507855
    Abstract: A process for supplying a flow of nitrogen to a site having flowrate requirements varying between a nominal flowrate and a range situated thereabove comprising: a) passing compressed air into a main line in a separating assembly formed by at least two membrane separation lines mounted in parallel, wherein at least one of the separation lines can be shut off from the main line, the separating assembly having one of the following configurations: a1) when the flowrate requirements are situated at a level of the nominal flowrate, all of the membrane separators of the assembly are in operation, none of the separating lines being shut off; a2) when the flowrate requirements of the site exceed a predetermined flowrate, at least one of the lines of the separating assembly is shut off, keeping at least one separation line and its membrane separator in operation; b) advancing nitrogen gas obtained at the outlet side of each of the membrane separators to a collector connected downstream of the main line; c) evacuating g
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: April 16, 1996
    Assignee: L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Lionel Barry
  • Patent number: 5505851
    Abstract: Semipermeable membranes of homogeneously miscible polymer alloys and a process for their preparation. In particular, semipermeable membranes of homogeneous polymer alloys which contain sulfonated, aromatic polyether ketones and at least one polyamide as the main constituents, wherein the polyamide is a completely aromatic polyamide.
    Type: Grant
    Filed: December 28, 1993
    Date of Patent: April 9, 1996
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Reinhard Wagener, Freddy Helmer-Metzmann, Otto Herrmann-Schonherr
  • Patent number: 5462586
    Abstract: An oil- and water-repellent filter which contains a porous filter material that has its internal and external surfaces coated with a compound formed by combining a fluoropolymer having a fluorine-containing aliphatic cyclic structure in the main chain and a fluoropolymer containing polyfluoroalkyl groups. The coating imparts superior oil- and water-repellency without impairment to the flow of air or other gases through the filter.
    Type: Grant
    Filed: September 7, 1994
    Date of Patent: October 31, 1995
    Assignee: Japan Gore-Tex, Inc.
    Inventors: Norihide Sugiyama, Masaru Nakamura, Sumihiro Moriyama, Fumihiro Sasaki
  • Patent number: 5417743
    Abstract: A self-adhesive vent filter adsorbent assembly with diffusion tube is provided for removing gaseous contaminants from an enclosure comprising a layer of polymer film forming a diffusion tube, two adhesive layers, at least one filtration layer and optionally an absorbent layer. An outside mounting assembly is also provided.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: May 23, 1995
    Assignee: W. L. Gore & Associates, Inc.
    Inventor: Edwin G. Dauber