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FR2193634A1 - Polyimide semi-permeable membranes - Google Patents

Polyimide semi-permeable membranes

Info

Publication number
FR2193634A1
FR2193634A1 FR7326510A FR7326510A FR2193634A1 FR 2193634 A1 FR2193634 A1 FR 2193634A1 FR 7326510 A FR7326510 A FR 7326510A FR 7326510 A FR7326510 A FR 7326510A FR 2193634 A1 FR2193634 A1 FR 2193634A1
Authority
FR
France
Prior art keywords
arom
main chain
unit
formula
divalent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7326510A
Other languages
French (fr)
Other versions
FR2193634B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US00303210A external-priority patent/US3822202A/en
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of FR2193634A1 publication Critical patent/FR2193634A1/en
Application granted granted Critical
Publication of FR2193634B1 publication Critical patent/FR2193634B1/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0081—After-treatment of organic or inorganic membranes
    • B01D67/0083—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/48—Polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/56—Polyamides, e.g. polyester-amides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/58—Other polymers having nitrogen in the main chain, with or without oxygen or carbon only
    • B01D71/62—Polycondensates having nitrogen-containing heterocyclic rings in the main chain
    • B01D71/64—Polyimides; Polyamide-imides; Polyester-imides; Polyamide acids or similar polyimide precursors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C08G63/19—Hydroxy compounds containing aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/68—Polyesters containing atoms other than carbon, hydrogen and oxygen
    • C08G63/682—Polyesters containing atoms other than carbon, hydrogen and oxygen containing halogens
    • C08G63/6824—Polyesters containing atoms other than carbon, hydrogen and oxygen containing halogens derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/6826—Dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
    • C08G69/32—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids from aromatic diamines and aromatic dicarboxylic acids with both amino and carboxylic groups aromatically bound
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)

Abstract

A semi-permeable membrane comprises >=50 wt.% of a polymer whose main chain contains repeat units contg. >=1 imide-, arom. ester- and/or arom. amide grp. It contains a rigid divalent sub-unit whose main chain single bonds are non-colinear; it is sterically unable (hindered) to rotate by 360 degrees about >=1 main chain single bonds; and over 50% of the atmos in the main chain form part of arom. grps. Esp., the repeat units are an imide unit of formula: where R' is a tetravalent and R is a divalent org. residue; an ester-unit of formula: (R"-O-C(=O)-R'"-C(=O)-O) where R" and R'" are indep. divalent org. residues; and/or an arom. amide-unit of formula (R-N(R7)-C(=O)-R'"-C(=O)-N(R7) where R and R'" are as above and R7 is H, low alkyl or phenyl. A polyimide prepd. from pyromellitic dianhydride and 4-isopropyl-1,3-diaminobenzene is suitable. Used for sepn. of mixture of fluids esp. gases e.g. sepn. of H2 from CH4.
FR7326510A 1972-07-20 1973-07-19 Polyimide semi-permeable membranes Granted FR2193634A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US27380272A 1972-07-20 1972-07-20
US00303210A US3822202A (en) 1972-07-20 1972-11-02 Heat treatment of membranes of selected polyimides,polyesters and polyamides
US322800A US3899309A (en) 1972-07-20 1973-01-11 Aromatic polyimide, polyester and polyamide separation membranes
US05/687,639 USRE30351E (en) 1972-07-20 1976-05-18 Aromatic polyimide, polyester and polyamide separation membranes

Publications (2)

Publication Number Publication Date
FR2193634A1 true FR2193634A1 (en) 1974-02-22
FR2193634B1 FR2193634B1 (en) 1980-03-28

Family

ID=27501081

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7326510A Granted FR2193634A1 (en) 1972-07-20 1973-07-19 Polyimide semi-permeable membranes

Country Status (2)

Country Link
US (1) USRE30351E (en)
FR (1) FR2193634A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2333548A1 (en) * 1975-12-06 1977-07-01 Bayer Ag NEW SEMI-PERMEABLE COPOLYAMIDE MEMBRANES, AND THEIR USE FOR REVERSE OSMOSIS
FR2456754A1 (en) * 1979-05-17 1980-12-12 Nitto Electric Ind Co PROCESS FOR PREPARING A MEMBRANE HAVING SELECTIVE POLYMIDE POLYIMIDE PERMEABILITY AND MEMBRANES PREPARED ACCORDING TO THIS PROCESS
EP0043265A1 (en) * 1980-07-01 1982-01-06 Ube Industries, Ltd. Gas separating material
FR2624756A1 (en) * 1987-12-16 1989-06-23 Central Glass Co Ltd SEMIPERMEABLE POLYBENZOXAZOLE MEMBRANE FOR GAS SEPARATION
EP0424041A3 (en) * 1989-10-16 1991-08-21 Exxon Research And Engineering Company Polyimide/aliphatic polyester copolymers
FR2710549A1 (en) * 1993-09-27 1995-04-07 Inst Francais Du Petrole High selectivity asymmetric membranes for gas separation and a process for their manufacture
FR2710550A1 (en) * 1993-09-27 1995-04-07 Inst Francais Du Petrole Asymmetric membranes of high selectivity for separation of gases and process for the manufacture

Families Citing this family (87)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3062739D1 (en) 1979-07-26 1983-05-19 Ube Industries Process for preparing aromatic polyimide semipermeable membranes
GB2104411B (en) 1981-07-08 1985-02-20 Ube Industries Aromatic polyimide composite separating membrane
US4435508A (en) 1981-11-20 1984-03-06 Gabridge Michael G Tissue culture vessel
US4493714A (en) 1982-05-06 1985-01-15 Teijin Limited Ultrathin film, process for production thereof, and use thereof for concentrating a specified gas in a gaseous mixture
US4428776A (en) 1982-06-23 1984-01-31 The Standard Oil Company Cellulosic semipermeable membranes containing silicon compounds
US4532041A (en) 1983-05-13 1985-07-30 Exxon Research And Engineering Co. Asymmetric polyimide reverse osmosis membrane, method for preparation of same and use thereof for organic liquid separations
US4551156A (en) 1984-01-16 1985-11-05 Standard Oil Company Permselective membrane compositions for gas separations and process for the separation of gases therewith
US4705540A (en) 1986-04-17 1987-11-10 E. I. Du Pont De Nemours And Company Polyimide gas separation membranes
US4781733A (en) 1986-07-23 1988-11-01 Bend Research, Inc. Semipermeable thin-film membranes comprising siloxane, alkoxysilyl and aryloxysilyl oligomers and copolymers
EP0263212B1 (en) 1986-10-08 1990-12-27 Ube Industries, Ltd. Method for removing water vapor from water vapor-containing gas
US4717393A (en) 1986-10-27 1988-01-05 E. I. Du Pont De Nemours And Company Polyimide gas separation membranes
US4717394A (en) 1986-10-27 1988-01-05 E. I. Du Pont De Nemours And Company Polyimide gas separation membranes
US4755192A (en) 1987-04-15 1988-07-05 Board Of Regents, The University Of Texas System Processes to condition gas permeable membranes
US4822382A (en) 1987-11-02 1989-04-18 Union Carbide Corporation Composite membranes, their manufacture and their use
US4838904A (en) 1987-12-07 1989-06-13 The Dow Chemical Company Semi-permeable membranes with an internal discriminating region
US4874401A (en) 1987-11-20 1989-10-17 The Dow Chemical Company Gas separation membranes from bisphenol AF polycarbonates and polyestercarbonates
US4955993A (en) 1987-12-07 1990-09-11 The Dow Chemical Company Semi-permeable hollow fiber gas separation membranes possessing a non-external discriminating region
US4880442A (en) 1987-12-22 1989-11-14 E. I. Du Pont De Nemours And Company Polyimide gas separation membranes
US4838900A (en) 1988-04-13 1989-06-13 E. I. Du Pont De Nemours And Company Polyimide gas separation membranes
US4948400A (en) 1988-06-30 1990-08-14 Nippon Steel Chemical Co., Ltd. Separation membranes and process for preparing the same
US4851014A (en) 1988-07-01 1989-07-25 The Dow Chemical Company Gas separation membranes derived from polycarbonates, polyesters, and polyestercarbonates containing tetrafluorobisphenol F
KR900701377A (en) * 1988-09-14 1990-12-01 제라드 피이. 루우니 Chlorine-resistant semipermeable membrane and its manufacturing method
US5055114A (en) * 1988-12-27 1991-10-08 Union Carbide Industrial Gases Technology Corporation Semipermeable membranes based on specified tetrabromobisphenol type polyesters
US4994095A (en) * 1988-12-27 1991-02-19 Union Carbide Industrial Gases Technology Corporation Semipermeable membranes based on specific 4,4'-(1H-alkylidene)bis[2,3,6-trialkylphenol]type polyesters
US4897092A (en) * 1989-02-27 1990-01-30 Air Products And Chemicals, Inc. Polyimide membrane having improved flux
US4952220A (en) 1989-04-11 1990-08-28 Air Products And Chemicals, Inc. Membranes formed from unsaturated polyimides
US5055116A (en) * 1989-05-22 1991-10-08 Hoechst Celanese Corp. Gas separation membranes comprising miscible blends of polyimide polymers
US4981497A (en) * 1989-06-01 1991-01-01 E. I. Du Pont De Nemours And Company Amine-modified polyimide membranes
US4932982A (en) 1989-06-01 1990-06-12 E. I. Du Pont De Nemours And Company Copolyimide gas separation membranes derived from substituted phenylene diamines and substituted methylene dianilines
US4932983A (en) 1989-06-01 1990-06-12 E. I. Du Pont De Nemours And Company Copolyimide gas separation membranes derived from substituted methylene dianilines and unsubstituted diamines
US5074891A (en) * 1989-07-27 1991-12-24 Hoechst Celanese Corp. Method of gas separation and membranes therefor
FR2650756B1 (en) * 1989-08-11 1991-10-31 Inst Francais Du Petrole GAS SEPARATION MEMBRANE
FR2650755B1 (en) * 1989-08-14 1991-10-31 Inst Francais Du Petrole GAS SEPARATION MEMBRANE
US4954144A (en) 1989-09-12 1990-09-04 Air Products And Chemicals, Inc. Polyimide membranes and their use for gas separation
US5032279A (en) * 1989-09-21 1991-07-16 Occidental Chemical Corporation Separation of fluids using polyimidesiloxane membrane
US5120329A (en) * 1989-09-27 1992-06-09 American Air Liquide Integrated system and method for providing a controlled atmosphere in a food storage facility
US5032149A (en) * 1989-10-10 1991-07-16 E. I. Du Pont De Nemours And Company Surfactant treatment of polyaramide gas separation membranes
US5015270A (en) * 1989-10-10 1991-05-14 E. I. Du Pont De Nemours And Company Phenylindane-containing polyimide gas separation membranes
US5034024A (en) * 1989-10-10 1991-07-23 E. I. Du Pont De Nemours And Company Surfactant treatment of aromatic polyimide gas separation membranes
US4983191A (en) * 1989-10-10 1991-01-08 E. I. Du Pont De Nemours And Company Production of aromatic polyimide membranes
US4931182A (en) 1989-11-08 1990-06-05 Air Products And Chemicals, Inc. Membranes formed from unsaturated polyimides
US4990667A (en) * 1990-01-29 1991-02-05 Air Products And Chemicals, Inc. Alkylated 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethanes
US5055616A (en) * 1990-01-29 1991-10-08 Air Products And Chemicals, Inc. Ortho-alkylated bisanilines having fluorenylidene bridging groups
US5042992A (en) * 1990-03-21 1991-08-27 W. R. Grace & Co.-Conn. Gas separation material
US5034027A (en) * 1990-03-30 1991-07-23 Air Products And Chemicals, Inc. Membranes formed from rigid aromatic polyamides
US5007945A (en) * 1990-04-12 1991-04-16 Air Products And Chemicals, Inc. Membranes formed from aromatic polyarylates
US5013332A (en) * 1990-05-03 1991-05-07 Air Products And Chemicals, Inc. Membranes formed from rigid polyarylates
US5009679A (en) * 1990-05-25 1991-04-23 Air Products And Chemicals, Inc. Membranes formed from rigid aromatic polyimide polymers
US5061809A (en) * 1990-05-25 1991-10-29 Air Products And Chemicals, Inc. 9,9-bis-(3,4-dicarboxyphenyl)fluorene dianhydrides
US5061298A (en) * 1990-06-13 1991-10-29 Air Products And Chemicals, Inc. Gas separating membranes formed from blends of polyimide polymers
US5042993A (en) * 1990-07-24 1991-08-27 Air Products And Chemicals, Inc. Gas separating membranes from polyimide polymers
US5045093A (en) * 1990-10-16 1991-09-03 Air Products And Chemicals, Inc. Gas separating membranes from polyimide polymers and a process for using the same
US5073176A (en) * 1990-11-05 1991-12-17 E. I. Du Pont De Nemours And Company Dicarboxylic acid polyesters and polyamides for fluid separation membranes
US5178650A (en) * 1990-11-30 1993-01-12 E. I. Du Pont De Nemours And Company Polyimide gas separation membranes and process of using same
US5076817A (en) * 1990-11-30 1991-12-31 E. I. Du Pont De Nemours And Company Polyamide gas separation membranes and process of using same
US5163977A (en) * 1991-08-22 1992-11-17 The Dow Chemical Company Semi-permeable gas separation membranes containing non-ionic surfactants possessing improved resistance to thermal compaction and processes for making and using the same
US5141530A (en) * 1991-08-22 1992-08-25 The Dow Chemical Company Polycarbonate, polyester, and polyestercarbonate semi-permeable gas separation membranes possessing improved gas selectivity and recovery, and processes for making and using the same
US5156656A (en) * 1991-09-13 1992-10-20 The Dow Chemical Company Semi-permeable membranes derived from reactive oligomers
US5232471A (en) * 1992-05-13 1993-08-03 Air Products And Chemicals, Inc. Membranes formed from nitrated polyarylates
US5266100A (en) * 1992-09-02 1993-11-30 E. I. Du Pont De Nemours And Company Alkyl substituted polyimide, polyamide and polyamide-imide gas separation membranes
US5248319A (en) * 1992-09-02 1993-09-28 E. I. Du Pont De Nemours And Company Gas separation membranes made from blends of aromatic polyamide, polymide or polyamide-imide polymers
US5232472A (en) * 1992-11-03 1993-08-03 E. I. Du Pont De Nemours And Company Polyimide and polyamide-imide gas separation membranes
US5286280A (en) * 1992-12-31 1994-02-15 Hoechst Celanese Corporation Composite gas separation membrane having a gutter layer comprising a crosslinked polar phenyl-containing - organopolysiloxane, and method for making the same -
US5352273A (en) * 1993-04-14 1994-10-04 E. I. Du Pont De Nemours And Company Alkyl substituted aromatic polyester gas separation membranes
US5322549A (en) * 1993-06-04 1994-06-21 E. I. Du Pont De Nemours And Company Polyimides and gas separation membranes prepared therefrom
US5591250A (en) 1993-08-09 1997-01-07 Gas Research Institute Material and process for separating carbon dioxide from methane
FR2710044B1 (en) * 1993-09-17 1995-10-13 Air Liquide Method for separating a gaseous hydride or a mixture of gaseous hydrides using a membrane.
JPH07178327A (en) * 1993-11-12 1995-07-18 Nitto Denko Corp Composite semipermeable membrane and manufacturing method thereof
US5647894A (en) * 1994-06-08 1997-07-15 Nitto Denko Corporation Gas separating composite membrane and process for producing the same
US5749943A (en) * 1995-02-27 1998-05-12 Petroleum Energy Center Method of selectively separating unsaturated hydrocarbon
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KR0184379B1 (en) * 1996-11-08 1999-04-15 박원훈 Separation membrane prepared from polyamide polymer containing 2,2'-bis (trifluoromethyl) biphenyl unit and method for separating gas mixture using same
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US6168649B1 (en) * 1998-12-09 2001-01-02 Mg Generon, Inc. Membrane for separation of xenon from oxygen and nitrogen and method of using same
US6500233B1 (en) 2000-10-26 2002-12-31 Chevron U.S.A. Inc. Purification of p-xylene using composite mixed matrix membranes
US7018445B2 (en) * 2002-12-02 2006-03-28 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Polyimide blends for gas separation membranes
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KR102446807B1 (en) 2016-11-04 2022-09-26 다우 글로벌 테크놀로지스 엘엘씨 Improved Polyimide Separation Membrane Manufacturing Method
EP4070880B1 (en) 2016-11-10 2024-10-02 Dow Global Technologies LLC Improved method to make carbon molecular sieve hollow fiber membranes
GB201711882D0 (en) 2017-07-24 2017-09-06 Fujifilm Mfg Europe Bv Gas separation elements
US11517857B2 (en) 2017-08-14 2022-12-06 Dow Global Technologies Llc Method to make carbon molecular sieve hollow fiber membranes
EP3841151A1 (en) 2018-08-23 2021-06-30 Dow Global Technologies LLC Cross-linked polyimide membranes and carbon molecular sieve hollow fiber membranes made therefrom
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2333548A1 (en) * 1975-12-06 1977-07-01 Bayer Ag NEW SEMI-PERMEABLE COPOLYAMIDE MEMBRANES, AND THEIR USE FOR REVERSE OSMOSIS
FR2456754A1 (en) * 1979-05-17 1980-12-12 Nitto Electric Ind Co PROCESS FOR PREPARING A MEMBRANE HAVING SELECTIVE POLYMIDE POLYIMIDE PERMEABILITY AND MEMBRANES PREPARED ACCORDING TO THIS PROCESS
EP0043265A1 (en) * 1980-07-01 1982-01-06 Ube Industries, Ltd. Gas separating material
FR2624756A1 (en) * 1987-12-16 1989-06-23 Central Glass Co Ltd SEMIPERMEABLE POLYBENZOXAZOLE MEMBRANE FOR GAS SEPARATION
EP0424041A3 (en) * 1989-10-16 1991-08-21 Exxon Research And Engineering Company Polyimide/aliphatic polyester copolymers
FR2710549A1 (en) * 1993-09-27 1995-04-07 Inst Francais Du Petrole High selectivity asymmetric membranes for gas separation and a process for their manufacture
FR2710550A1 (en) * 1993-09-27 1995-04-07 Inst Francais Du Petrole Asymmetric membranes of high selectivity for separation of gases and process for the manufacture
US5633039A (en) * 1993-09-27 1997-05-27 Institut Francais Du Petrole Highly selective asymmetric membranes for gas separation and method for the manufacture thereof
US5674629A (en) * 1993-09-27 1997-10-07 Institut Francais Du Petrole Highly selective asymmetric membranes for gas separation

Also Published As

Publication number Publication date
USRE30351E (en) 1980-07-29
FR2193634B1 (en) 1980-03-28

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