SG25493G - Polyamide reverse osmosis membranes - Google Patents

Polyamide reverse osmosis membranes

Info

Publication number
SG25493G
SG25493G SG254/93A SG25493A SG25493G SG 25493 G SG25493 G SG 25493G SG 254/93 A SG254/93 A SG 254/93A SG 25493 A SG25493 A SG 25493A SG 25493 G SG25493 G SG 25493G
Authority
SG
Singapore
Prior art keywords
reverse osmosis
osmosis membranes
polyamide reverse
polyamide
membranes
Prior art date
Application number
SG254/93A
Other languages
English (en)
Original Assignee
Dow Chemical 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
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Publication of SG25493G publication Critical patent/SG25493G/en

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/12—Composite membranes; Ultra-thin membranes
    • B01D69/125—In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction
    • B01D69/1251—In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction by interfacial polymerisation
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Polyamides (AREA)
SG254/93A 1987-11-18 1993-03-06 Polyamide reverse osmosis membranes SG25493G (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/122,307 US4769148A (en) 1987-11-18 1987-11-18 Novel polyamide reverse osmosis membranes

Publications (1)

Publication Number Publication Date
SG25493G true SG25493G (en) 1993-07-09

Family

ID=22401937

Family Applications (1)

Application Number Title Priority Date Filing Date
SG254/93A SG25493G (en) 1987-11-18 1993-03-06 Polyamide reverse osmosis membranes

Country Status (13)

Country Link
US (1) US4769148A (de)
EP (1) EP0316525B1 (de)
JP (1) JP2727087B2 (de)
KR (1) KR960016519B1 (de)
CN (1) CN1023866C (de)
AU (1) AU611474B2 (de)
BR (1) BR8804600A (de)
CA (1) CA1333462C (de)
DE (1) DE3876387T2 (de)
DK (1) DK174264B1 (de)
NO (1) NO172030C (de)
SG (1) SG25493G (de)
ZA (1) ZA886618B (de)

Families Citing this family (114)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4765897A (en) * 1986-04-28 1988-08-23 The Dow Chemical Company Polyamide membranes useful for water softening
US4812270A (en) * 1986-04-28 1989-03-14 Filmtec Corporation Novel water softening membranes
US4769148A (en) * 1987-11-18 1988-09-06 The Dow Chemical Company Novel polyamide reverse osmosis membranes
US4872984A (en) * 1988-09-28 1989-10-10 Hydranautics Corporation Interfacially synthesized reverse osmosis membrane containing an amine salt and processes for preparing the same
US5580650A (en) * 1989-12-29 1996-12-03 The Dow Chemical Company Process of preparing a composite membrane
NL9001274A (nl) * 1990-06-06 1992-01-02 X Flow Bv Semi-permeabel composietmembraan, alsmede werkwijze voor het vervaardigen ervan.
NL9001273A (nl) * 1990-06-06 1992-01-02 Tno Semi-permeabel composietmembraan.
US5173335A (en) * 1990-07-31 1992-12-22 E. I. Du Pont De Nemours And Company Method of producing multilayer reverse osmosis membrane of polyamide-urea
US5182024A (en) * 1990-12-05 1993-01-26 Exxon Research And Engineering Company Separation of hydrocarbon dewaxing and deasphalting solvents from dewaxed and/or deasphalted oil using interfacially polymerized membrane
US5277819A (en) * 1992-06-03 1994-01-11 Pall Corporation Cold draft beer filter membrane cleaning process
US5262054A (en) * 1992-12-30 1993-11-16 E. I. Du Pont De Nemours And Company Process for opening reverse osmosis membranes
US5368889A (en) * 1993-04-16 1994-11-29 The Dow Chemical Company Method of making thin film composite membranes
JPH09501609A (ja) * 1993-08-23 1997-02-18 ザ ダウ ケミカル カンパニー 橋かけ結合可能な可溶性重合体から製造される膜
JPH07178327A (ja) * 1993-11-12 1995-07-18 Nitto Denko Corp 複合半透膜及びその製造方法
FR2761617A1 (fr) * 1997-04-04 1998-10-09 Fluid Sys Corp Membranes de separation selective
WO1999001208A1 (fr) 1997-07-02 1999-01-14 Nitto Denko Corporation Membrane composite d'osmose inverse et procede de production
US5922203A (en) * 1997-10-07 1999-07-13 Hydranautics Amine monomers and their use in preparing interfacially synthesized membranes for reverse osmosis and nanofiltration
US5945000A (en) * 1998-01-02 1999-08-31 J. R. Simplot Company Methods of purifying phosphoric acid
US6015495A (en) * 1998-02-18 2000-01-18 Saehan Industries Incorporation Composite polyamide reverse osmosis membrane and method of producing the same
US6063278A (en) * 1998-04-28 2000-05-16 Saehan Industries Inc. Composite polyamide reverse osmosis membrane and method of producing the same
KR100477583B1 (ko) * 1998-09-03 2005-07-08 주식회사 새 한 고유량 역삼투 폴리아마이드 막 제조방법
US6368507B1 (en) * 1998-10-14 2002-04-09 Saekan Industries Incorporation Composite polyamide reverse osmosis membrane and method of producing the same
KR100477590B1 (ko) * 1999-03-09 2005-03-18 주식회사 새 한 고유량 역삼투막 제조방법
US6245234B1 (en) * 1999-06-03 2001-06-12 Saehan Industries Incorporation Composite polyamide reverse osmosis membrane and method of producing the same
US6280853B1 (en) 1999-06-10 2001-08-28 The Dow Chemical Company Composite membrane with polyalkylene oxide modified polyamide surface
US6464873B1 (en) * 1999-06-15 2002-10-15 Hydranautics Interfacially polymerized, bipiperidine-polyamide membranes for reverse osmosis and/or nanofiltration and process for making the same
KR20020029669A (ko) 1999-07-21 2002-04-19 데이비드 엠 모이어 미생물 필터 및 수중 미생물 제거 방법
KR100371901B1 (ko) * 1999-10-30 2003-02-11 한국화학연구원 Ｐｖａ 보호막을 포함하는 폴리아미드 나노분리막
KR100477591B1 (ko) * 2001-01-17 2005-03-18 주식회사 새 한 폴리아마이드 역삼투 복합막 및 그 제조방법
AU784308B2 (en) * 2001-02-06 2006-03-09 Saehan Industries Incorporation Composite polyamide reverse osmosis membrane and method for producing the same
KR100477592B1 (ko) * 2001-02-07 2005-03-18 주식회사 새 한 폴리아마이드 역삼투 복합막 및 그 제조방법
EP1230971B1 (de) * 2001-02-12 2005-05-11 Saehan Industries, Inc. Zusammengesetzte Polyamid-Umkehrosmosemembran und Verfahren zu ihrer Herstellung
US20030015470A1 (en) * 2001-07-20 2003-01-23 Muralidhara Harapanahalli S. Nanofiltration water-softening apparatus and method
US7614507B2 (en) 2001-08-23 2009-11-10 Pur Water Purification Products Inc. Water filter materials, water filters and kits containing particles coated with cationic polymer and processes for using the same
KR100777951B1 (ko) 2001-08-23 2007-11-28 더 프록터 앤드 갬블 캄파니 정수 필터 재료, 대응하는 정수 필터 및 그의 사용 방법
US7615152B2 (en) 2001-08-23 2009-11-10 Pur Water Purification Products, Inc. Water filter device
US7614508B2 (en) 2001-08-23 2009-11-10 Pur Water Purification Products Inc. Water filter materials, water filters and kits containing silver coated particles and processes for using the same
US20050279696A1 (en) 2001-08-23 2005-12-22 Bahm Jeannine R Water filter materials and water filters containing a mixture of microporous and mesoporous carbon particles
US7156997B2 (en) * 2001-10-05 2007-01-02 Dow Global Technologies Inc. Package assembly for piperazine-based membranes
US7279097B2 (en) * 2003-06-18 2007-10-09 Toray Industries, Inc. Composite semipermeable membrane, and production process thereof
US20050056589A1 (en) * 2003-09-16 2005-03-17 General Electric Company Treatment of semi-permeable filtration membranes
JP2011125856A (ja) * 2003-11-26 2011-06-30 Toray Ind Inc 複合半透膜の製造方法およびポリアミド複合半透膜
JP4656502B2 (ja) * 2004-10-01 2011-03-23 日東電工株式会社 複合半透膜及びその製造方法
JP4656511B2 (ja) * 2004-10-04 2011-03-23 日東電工株式会社 複合逆浸透膜の製造方法
NL1030346C2 (nl) * 2004-11-15 2006-09-20 Toray Industries Semipermeabel composietmembraan, productiewerkwijze daarvan, en element, fluïdumscheidingsinstallatie en werkwijze voor behandeling van water onder toepassing van hetzelfde.
RU2007137124A (ru) * 2005-03-09 2009-04-20 Дзе Риджентс Оф Дзе Юниверсити Оф Калифорния (Us) Нанокомпозитные мембраны и способы их получения и применения
TW200706499A (en) * 2005-07-12 2007-02-16 Cargill Inc Extended-life water softening system, apparatus and method
KR100619497B1 (ko) 2005-07-29 2006-09-06 주식회사 새한 내오염성 폴리아마이드계 복합막 및 그 제조방법
KR100692394B1 (ko) * 2005-08-10 2007-03-09 주식회사 새 한 보론 제거 기능이 있는 역삼투 분리막의 제조방법
US7882963B2 (en) 2006-05-12 2011-02-08 Dow Global Technologies Inc. Modified membrane
JP4936438B2 (ja) * 2006-10-10 2012-05-23 日東電工株式会社 乾燥複合半透膜の製造方法
JP2008093544A (ja) * 2006-10-10 2008-04-24 Nitto Denko Corp 複合半透膜及びその製造方法
CA2667579A1 (en) * 2006-10-27 2008-05-15 The Regents Of The University Of California Micro-and nanocomposite support structures for reverse osmosis thin film membranes
JP2008246419A (ja) * 2007-03-30 2008-10-16 Nitto Denko Corp 複合半透膜の製造方法
AU2008302086A1 (en) * 2007-09-21 2009-03-26 The Regents Of The University Of California Nanocomposite membranes and methods of making and using same
US8177978B2 (en) 2008-04-15 2012-05-15 Nanoh20, Inc. Reverse osmosis membranes
US7888397B1 (en) 2008-04-30 2011-02-15 Sandia Corporation Poly(phenylene)-based anion exchange membrane
US8216473B2 (en) * 2008-06-13 2012-07-10 Solution Dynamics, Llc Apparatus and methods for solution processing using reverse osmosis
US8960449B2 (en) * 2008-10-31 2015-02-24 Toray Industries, Inc. Composite semipermeable membrane and manufacturing method therefor
US8754139B2 (en) * 2009-02-20 2014-06-17 International Business Machines Corporation Polyamide membranes with fluoroalcohol functionality
US20100216967A1 (en) * 2009-02-20 2010-08-26 International Business Machines Corporation Interfacial polymerization methods for making fluoroalcohol-containing polyamides
TWI398353B (zh) * 2009-03-02 2013-06-11 Ind Tech Res Inst 奈米纖維材料與脫鹽過濾材料
DE102009002144A1 (de) 2009-04-02 2010-10-07 Henkel Ag & Co. Kgaa Umkehrosmoseverfahren zur Aufbereitung von Spülwaser enthaltend polyvalente Metall-Kationen
WO2011008549A2 (en) 2009-06-29 2011-01-20 NanoH2O Inc. Improved hybrid tfc ro membranes with nitrogen additives
CN101804302B (zh) * 2010-04-16 2012-05-16 江苏朗生生命科技有限公司 空心纤维反渗透复合膜及其制备方法
CN101829508A (zh) * 2010-05-11 2010-09-15 杭州水处理技术研究开发中心有限公司 一种新型聚酰胺纳滤膜及制备方法
US8857629B2 (en) 2010-07-15 2014-10-14 International Business Machines Corporation Composite membrane with multi-layered active layer
GB201012083D0 (en) 2010-07-19 2010-09-01 Imp Innovations Ltd Thin film composite membranes for separation
WO2012064939A2 (en) 2010-11-10 2012-05-18 Nanoh2O, Inc. Improved hybrid tfc ro membranes with non-metallic additives
CN103328083B (zh) * 2011-01-24 2018-02-09 陶氏环球技术有限责任公司 复合聚酰胺膜
KR101240956B1 (ko) * 2011-02-18 2013-03-11 웅진케미칼 주식회사 내오염성능이 우수한 역삼투 복합막 및 그의 제조방법
US9022227B2 (en) 2011-03-21 2015-05-05 International Business Machines Corporation Composite membranes and methods of preparation thereof
CN102814126A (zh) * 2011-06-09 2012-12-12 中国科学院城市环境研究所 一种高通量抗氧化纳滤膜的制备方法
US8895104B2 (en) 2011-07-01 2014-11-25 International Business Machines Corporation Thin film composite membranes embedded with molecular cage compounds
CN102294177B (zh) * 2011-08-17 2013-06-26 浙江大学 一种含有磺酸甜菜碱型两性离子的反渗透复合膜
GB201117950D0 (en) 2011-10-18 2011-11-30 Imp Innovations Ltd Membranes for separation
CN102489186A (zh) * 2011-11-30 2012-06-13 杭州水处理技术研究开发中心有限公司 一种荷正电复合纳滤膜的制备方法
KR101398936B1 (ko) * 2012-04-05 2014-05-27 성균관대학교산학협력단 폴리 아미드 수지의 제조 방법
EP2836290A4 (de) 2012-04-09 2016-01-06 3M Innovative Properties Co Strukturen mit dünnschicht-verbundmembranen
US9561474B2 (en) 2012-06-07 2017-02-07 International Business Machines Corporation Composite membrane with multi-layered active layer
US9630149B2 (en) 2012-07-19 2017-04-25 Dow Global Technologies Llc Composite polyamide membrane with improved structure
TWI519339B (zh) 2012-12-28 2016-02-01 財團法人工業技術研究院 過濾膜
WO2014109946A1 (en) 2013-01-14 2014-07-17 Dow Global Technologies Llc Composite polyamide membrane
WO2014109947A1 (en) 2013-01-14 2014-07-17 Dow Global Technologies Llc Composite polyamide membrane comprising substituted benzamide monomer
US9289729B2 (en) 2013-03-16 2016-03-22 Dow Global Technologies Llc Composite polyamide membrane derived from carboxylic acid containing acyl halide monomer
US9387442B2 (en) 2013-05-03 2016-07-12 Dow Global Technologies Llc Composite polyamide membrane derived from an aliphatic acyclic tertiary amine compound
EP3077088B1 (de) 2013-12-02 2017-12-27 Dow Global Technologies LLC Methode zur herstellung einer mit salpetriger säure nachbehandelten polyamid-kompositmembran
WO2015084512A1 (en) 2013-12-02 2015-06-11 Dow Global Technologies Llc Composite polyamide membrane treated with dihyroxyaryl compounds and nitrous acid
US9616392B2 (en) 2014-01-09 2017-04-11 Dow Global Technologies Llc Composite polyamide membrane having high acid content and low azo content
ES2677994T3 (es) 2014-01-09 2018-08-08 Dow Global Technologies Llc Membrana de poliamida de material compuesto con contenido azoico preferido
KR102273550B1 (ko) 2014-01-09 2021-07-07 다우 글로벌 테크놀로지스 엘엘씨 아조 함량 및 높은 산 함량을 갖는 복합 폴리아미드 막
US9534097B2 (en) 2014-04-25 2017-01-03 Sandia Corporation Poly(phenylene alkylene)-based lonomers
CN106257977B (zh) 2014-04-28 2019-10-29 陶氏环球技术有限责任公司 用亚硝酸后处理的复合聚酰胺膜
CN106232216B (zh) 2014-05-14 2019-10-11 陶氏环球技术有限责任公司 用亚硝酸后处理的复合聚酰胺膜
US9795928B2 (en) 2014-06-24 2017-10-24 Nano And Advanced Materials Institute Limited Stepwise interfacial polymerization technique with different reagent solution designs to prepare hollow fiber nanofiltration membrane composites
CN106604773A (zh) 2014-07-07 2017-04-26 纳幕尔杜邦公司 包含在纳米纤维片材上的浇铸薄膜的复合过滤膜
CN105435656B (zh) 2014-07-22 2017-10-03 中国石油化工股份有限公司 一种复合纳滤膜及其制备方法
JP2016068019A (ja) * 2014-09-30 2016-05-09 日東電工株式会社 複合半透膜及びその製造方法、スパイラル型分離膜エレメント
CN105251372B (zh) * 2015-07-13 2017-09-29 淮海工学院 一种抗污耐氯芳香聚酰胺复合膜的制备方法
US10518221B2 (en) 2015-07-29 2019-12-31 Gradiant Corporation Osmotic desalination methods and associated systems
US9861940B2 (en) 2015-08-31 2018-01-09 Lg Baboh2O, Inc. Additives for salt rejection enhancement of a membrane
US9737859B2 (en) 2016-01-11 2017-08-22 Lg Nanoh2O, Inc. Process for improved water flux through a TFC membrane
US10155203B2 (en) 2016-03-03 2018-12-18 Lg Nanoh2O, Inc. Methods of enhancing water flux of a TFC membrane using oxidizing and reducing agents
KR101958262B1 (ko) * 2016-12-26 2019-07-02 한국수자원공사 탄소나노튜브가 함유된 지지체를 포함하는 역삼투 분리막 및 이의 제조방법
DE112018003852T5 (de) 2017-07-28 2020-04-30 R. Chowdhury Maqsud Glatte polymermembranen und elektrospraydruckverfahren zu deren herstellung
JP7300810B2 (ja) 2017-09-15 2023-06-30 日東電工株式会社 複合半透膜及びその製造方法
KR101971154B1 (ko) * 2017-09-19 2019-04-22 키넷 주식회사 산소 농축에 이용되는 중공사막의 제조방법
KR101998628B1 (ko) * 2017-09-19 2019-07-10 키넷 주식회사 중공사막 및 이를 이용한 산소 농축을 위한 분리막 시스템
CN108079806B (zh) 2018-02-07 2020-09-08 浙江大学 一种聚酰胺半透膜、制备方法及其应用
CN108771985A (zh) * 2018-06-12 2018-11-09 上海凯矜新材料科技有限公司 一种复合反渗透膜及其制备方法
WO2020041542A1 (en) 2018-08-22 2020-02-27 Gradiant Corporation Liquid solution concentration system comprising isolated subsystem and related methods
EP4247522A4 (de) 2020-11-17 2024-10-09 Gradiant Corp Osmotische verfahren und systeme mit energierückgewinnung
US20230241559A1 (en) * 2020-11-30 2023-08-03 Memstar Usa Inc. Reverse osmosis membrane and method of producing the same
CN113402767A (zh) * 2021-06-28 2021-09-17 浙江工业大学 一种基于界面聚合的聚酰胺全热交换膜及其制备方法

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3567632A (en) * 1968-09-04 1971-03-02 Du Pont Permselective,aromatic,nitrogen-containing polymeric membranes
NL171019C (nl) * 1969-07-08 1983-02-01 Consiglio Nazionale Ricerche Membranen voor omgekeerde osmose.
NL7009957A (de) * 1969-07-08 1971-01-12
US3600350A (en) * 1970-04-20 1971-08-17 Du Pont Poly(p-benzamide) composition,process and product
US3744642A (en) * 1970-12-30 1973-07-10 Westinghouse Electric Corp Interface condensation desalination membranes
US3904519A (en) * 1971-10-19 1975-09-09 Us Interior Reverse osmosis process using crosslinked aromatic polyamide membranes
US3948823A (en) * 1972-08-01 1976-04-06 Allied Chemical Corporation Method of making permselective interpolymer membranes
JPS5223346B2 (de) * 1972-08-30 1977-06-23
US4039440A (en) * 1972-09-19 1977-08-02 The United States Of America As Represented By The Secretary Of The Interior Reverse osmosis membrane
US3993625A (en) * 1973-05-28 1976-11-23 Toray Industries, Inc. Permselective polymeric membranes of organic polyamide or polyhydrazide
US3951789A (en) * 1973-10-11 1976-04-20 Allied Chemical Corporation Novel high diffusivity membranes
US4137219A (en) * 1974-02-15 1979-01-30 Bayer Aktiengesellschaft Polycondensates containing hydroxyquinoline end groups, their use for the preparation of polymers containing metals and metal containing polycondensates
US3951815A (en) * 1974-09-05 1976-04-20 Universal Oil Products Company Composite semipermeable membranes made from polyethylenimine
US3926798A (en) * 1974-10-17 1975-12-16 Us Interior Reverse osmosis membrane
US4005012A (en) * 1975-09-22 1977-01-25 The United States Of America As Represented By The Secretary Of The Interior Semipermeable membranes and the method for the preparation thereof
JPS5535910A (en) * 1978-09-06 1980-03-13 Teijin Ltd Permselectivity composite membrane and preparation thereof
US4259183A (en) * 1978-11-07 1981-03-31 Midwest Research Institute Reverse osmosis membrane
US4277344A (en) * 1979-02-22 1981-07-07 Filmtec Corporation Interfacially synthesized reverse osmosis membrane
US4337154A (en) * 1979-04-04 1982-06-29 Nippon Shokubai Kagaku Kogyo Co., Ltd. Crosslinked composite semipermeable membrane
US4387024A (en) * 1979-12-13 1983-06-07 Toray Industries, Inc. High performance semipermeable composite membrane and process for producing the same
US4525526A (en) * 1980-02-21 1985-06-25 The Dow Chemical Company Surface active polymeric surfactants containing side chain hydrophobes
US4426489A (en) * 1980-02-21 1984-01-17 The Dow Chemical Company Surface active polymeric surfactants containing side chain hydrophobes
US4337185A (en) * 1980-06-23 1982-06-29 The Dow Chemical Company Process for making cationic structured particle latexes using reactive polymeric surfactants
JPS5727102A (en) * 1980-07-28 1982-02-13 Nitto Electric Ind Co Ltd Composite semipermeable membrane and its production
JPS5824303A (ja) * 1981-08-03 1983-02-14 Teijin Ltd 耐酸化性複合半透膜
US4758343A (en) * 1985-09-20 1988-07-19 Toray Industries, Inc. Interfacially synthesized reverse osmosis membrane
US4769148A (en) * 1987-11-18 1988-09-06 The Dow Chemical Company Novel polyamide reverse osmosis membranes

Also Published As

Publication number Publication date
CN1033187A (zh) 1989-05-31
NO883948D0 (no) 1988-09-05
JP2727087B2 (ja) 1998-03-11
DE3876387T2 (de) 1993-06-09
AU2176888A (en) 1989-05-18
JPH01130707A (ja) 1989-05-23
KR890008212A (ko) 1989-07-10
KR960016519B1 (ko) 1996-12-14
CN1023866C (zh) 1994-02-23
US4769148A (en) 1988-09-06
BR8804600A (pt) 1989-05-23
NO172030C (no) 1993-06-02
DK174264B1 (da) 2002-10-28
CA1333462C (en) 1994-12-13
DE3876387D1 (de) 1993-01-14
EP0316525A3 (en) 1990-05-16
EP0316525B1 (de) 1992-12-02
ZA886618B (en) 1990-05-30
AU611474B2 (en) 1991-06-13
NO172030B (no) 1993-02-22
EP0316525A2 (de) 1989-05-24
DK495888A (da) 1989-05-19
DK495888D0 (da) 1988-09-06
NO883948L (no) 1989-05-19

Similar Documents

Publication Publication Date Title
SG25493G (en) Polyamide reverse osmosis membranes
EP0275027A3 (en) Reverse osmosis membranes
US4574049B1 (en) Reverse osmosis system
GB2247419B (en) Semipermeable composite membranes
ZA906425B (en) Asymmetric porous polyamide membranes
EP0438372A3 (en) Reverse osmosis system
EP0245863A3 (en) Composite ultrafiltration membranes
IL87126A0 (en) Reverse osmosis membranes
IL81340A0 (en) Reverse osmosis separation device
GB8701193D0 (en) Polymeric microporous membranes
ZA916911B (en) Reverse osmosis membranes of polyamideurethane.
EP0293737A3 (en) Ammonia separation using semipermeable membranes
GB8610339D0 (en) Semipermeable filtration membrane
GB2198972B (en) Filtration membranes
GB2188275B (en) Polyamide membranes
IL94091A0 (en) Process for increasing the salt passage of polyamide reverse osmosis membranes
GB2193149B (en) Polyamide membranes
EP0201320A3 (en) Reverse osmosis permeator
AU4787685A (en) Aromatic polyamide membrane for reverse osmosis
GB8404855D0 (en) Reverse osmosis membrane
GB8724818D0 (en) Reverse osmosis membranes
GB2238966B (en) Solvent-stable semipermeable composite membranes
ZA885253B (en) Rejection enhancing coatings for reverse osmosis membranes
IL79905A0 (en) Electrodialysis membranes
ZA886938B (en) Chlorine-resistant semipermeable membranes