IL44761A - Poly-and copolypiperazinamides membranes for reverse osmosis made therefrom and their preparation - Google Patents

Poly-and copolypiperazinamides membranes for reverse osmosis made therefrom and their preparation

Info

Publication number: IL44761A
Authority: IL; Israel
Prior art keywords: membrane; water; membranes; solution; process according
Prior art date: 1973-05-07

Application number

IL44761A

Other languages

English (en)

Other versions

IL44761A0 (en

Original Assignee

Montedison Spa

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.)

1973-05-07

Filing date

1974-05-03

Publication date

1977-10-31

1974-05-03 Application filed by Montedison Spa filed Critical Montedison Spa

1974-07-31 Publication of IL44761A0 publication Critical patent/IL44761A0/xx

1977-10-31 Publication of IL44761A publication Critical patent/IL44761A/en

Links

239000012528 membrane Substances 0.000 title claims description 99
238000001223 reverse osmosis Methods 0.000 title claims description 21
238000002360 preparation method Methods 0.000 title claims description 15
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
238000000034 method Methods 0.000 claims description 29
GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 claims description 20
239000002904 solvent Substances 0.000 claims description 20
229920000642 polymer Polymers 0.000 claims description 17
150000003254 radicals Chemical class 0.000 claims description 13
150000003839 salts Chemical class 0.000 claims description 13
239000002253 acid Substances 0.000 claims description 11
238000005345 coagulation Methods 0.000 claims description 7
230000015271 coagulation Effects 0.000 claims description 7
238000007654 immersion Methods 0.000 claims description 7
239000003960 organic solvent Substances 0.000 claims description 7
KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 6
238000007669 thermal treatment Methods 0.000 claims description 6
238000001704 evaporation Methods 0.000 claims description 5
230000008020 evaporation Effects 0.000 claims description 5
238000003892 spreading Methods 0.000 claims description 5
ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 4
150000007513 acids Chemical class 0.000 claims description 4
125000000217 alkyl group Chemical group 0.000 claims description 4
239000005357 flat glass Substances 0.000 claims description 4
-1 heterocyclic dicarboxylic acids Chemical class 0.000 claims description 4
AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 4
230000015572 biosynthetic process Effects 0.000 claims description 3
150000001991 dicarboxylic acids Chemical class 0.000 claims description 3
229910052739 hydrogen Inorganic materials 0.000 claims description 3
239000001257 hydrogen Substances 0.000 claims description 3
UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
239000005864 Sulphur Chemical group 0.000 claims description 2
125000001931 aliphatic group Chemical group 0.000 claims description 2
125000003118 aryl group Chemical group 0.000 claims description 2
150000005840 aryl radicals Chemical class 0.000 claims description 2
QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
239000001110 calcium chloride Substances 0.000 claims description 2
229910001628 calcium chloride Inorganic materials 0.000 claims description 2
235000011148 calcium chloride Nutrition 0.000 claims description 2
125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 2
125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
229910052760 oxygen Inorganic materials 0.000 claims description 2
239000001301 oxygen Substances 0.000 claims description 2
229920006395 saturated elastomer Polymers 0.000 claims description 2
238000006467 substitution reaction Methods 0.000 claims description 2
229910013553 LiNO Inorganic materials 0.000 claims 1
QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims 1
238000009835 boiling Methods 0.000 claims 1
238000004090 dissolution Methods 0.000 claims 1
150000002431 hydrogen Chemical class 0.000 claims 1
125000004193 piperazinyl group Chemical group 0.000 claims 1
235000011149 sulphuric acid Nutrition 0.000 claims 1
239000000243 solution Substances 0.000 description 43
FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 26
239000011780 sodium chloride Substances 0.000 description 19
239000011521 glass Substances 0.000 description 14
YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 12
239000004952 Polyamide Substances 0.000 description 6
238000010612 desalination reaction Methods 0.000 description 6
229920002647 polyamide Polymers 0.000 description 6
238000006068 polycondensation reaction Methods 0.000 description 6
239000000463 material Substances 0.000 description 5
HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
239000010410 layer Substances 0.000 description 4
239000000203 mixture Substances 0.000 description 4
239000000376 reactant Substances 0.000 description 4
238000003756 stirring Methods 0.000 description 4
UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
229920002301 cellulose acetate Polymers 0.000 description 3
230000003204 osmotic effect Effects 0.000 description 3
230000035699 permeability Effects 0.000 description 3
239000013535 sea water Substances 0.000 description 3
238000000926 separation method Methods 0.000 description 3
239000000725 suspension Substances 0.000 description 3
VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
238000012696 Interfacial polycondensation Methods 0.000 description 2
TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 2
238000005056 compaction Methods 0.000 description 2
JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
238000000354 decomposition reaction Methods 0.000 description 2
230000000694 effects Effects 0.000 description 2
239000000835 fiber Substances 0.000 description 2
238000001914 filtration Methods 0.000 description 2
238000007710 freezing Methods 0.000 description 2
230000008014 freezing Effects 0.000 description 2
VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
150000004885 piperazines Chemical class 0.000 description 2
238000000935 solvent evaporation Methods 0.000 description 2
239000000126 substance Substances 0.000 description 2
VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
239000003643 water by type Substances 0.000 description 2
NSMWYRLQHIXVAP-OLQVQODUSA-N (2r,5s)-2,5-dimethylpiperazine Chemical compound C[C@H]1CN[C@H](C)CN1 NSMWYRLQHIXVAP-OLQVQODUSA-N 0.000 description 1
PPPVVCNTNQQTSI-UHFFFAOYSA-N 3,4-dichlorofuran-2,5-dicarboxylic acid Chemical compound OC(=O)c1oc(C(O)=O)c(Cl)c1Cl PPPVVCNTNQQTSI-UHFFFAOYSA-N 0.000 description 1
240000007154 Coffea arabica Species 0.000 description 1
IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 1
OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
244000269722 Thea sinensis Species 0.000 description 1
239000005862 Whey Substances 0.000 description 1
102000007544 Whey Proteins Human genes 0.000 description 1
108010046377 Whey Proteins Proteins 0.000 description 1
238000010521 absorption reaction Methods 0.000 description 1
229940024606 amino acid Drugs 0.000 description 1
150000001413 amino acids Chemical class 0.000 description 1
239000003242 anti bacterial agent Substances 0.000 description 1
229940088710 antibiotic agent Drugs 0.000 description 1
239000007864 aqueous solution Substances 0.000 description 1
229910052799 carbon Inorganic materials 0.000 description 1
238000006243 chemical reaction Methods 0.000 description 1
235000016213 coffee Nutrition 0.000 description 1
235000013353 coffee beverage Nutrition 0.000 description 1
238000009833 condensation Methods 0.000 description 1
230000005494 condensation Effects 0.000 description 1
238000001816 cooling Methods 0.000 description 1
229960001760 dimethyl sulfoxide Drugs 0.000 description 1
229940113088 dimethylacetamide Drugs 0.000 description 1
238000007598 dipping method Methods 0.000 description 1
235000015201 grapefruit juice Nutrition 0.000 description 1
229940088597 hormone Drugs 0.000 description 1
239000005556 hormone Substances 0.000 description 1
125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
150000007529 inorganic bases Chemical class 0.000 description 1
125000005647 linker group Chemical group 0.000 description 1
239000007791 liquid phase Substances 0.000 description 1
229910001629 magnesium chloride Inorganic materials 0.000 description 1
239000000395 magnesium oxide Substances 0.000 description 1
CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
238000004519 manufacturing process Methods 0.000 description 1
HNEGQIOMVPPMNR-NSCUHMNNSA-N mesaconic acid Chemical compound OC(=O)C(/C)=C/C(O)=O HNEGQIOMVPPMNR-NSCUHMNNSA-N 0.000 description 1
229910052751 metal Inorganic materials 0.000 description 1
239000002184 metal Substances 0.000 description 1
HNEGQIOMVPPMNR-UHFFFAOYSA-N methylfumaric acid Natural products OC(=O)C(C)=CC(O)=O HNEGQIOMVPPMNR-UHFFFAOYSA-N 0.000 description 1
235000013336 milk Nutrition 0.000 description 1
239000008267 milk Substances 0.000 description 1
210000004080 milk Anatomy 0.000 description 1
238000002156 mixing Methods 0.000 description 1
239000000178 monomer Substances 0.000 description 1
AJFDBNQQDYLMJN-UHFFFAOYSA-N n,n-diethylacetamide Chemical compound CCN(CC)C(C)=O AJFDBNQQDYLMJN-UHFFFAOYSA-N 0.000 description 1
239000004745 nonwoven fabric Substances 0.000 description 1
150000007530 organic bases Chemical class 0.000 description 1
239000000123 paper Substances 0.000 description 1
239000000825 pharmaceutical preparation Substances 0.000 description 1
229940127557 pharmaceutical product Drugs 0.000 description 1
239000012071 phase Substances 0.000 description 1
239000002798 polar solvent Substances 0.000 description 1
229920000139 polyethylene terephthalate Polymers 0.000 description 1
239000005020 polyethylene terephthalate Substances 0.000 description 1
229920001343 polytetrafluoroethylene Polymers 0.000 description 1
239000004810 polytetrafluoroethylene Substances 0.000 description 1
102000004169 proteins and genes Human genes 0.000 description 1
108090000623 proteins and genes Proteins 0.000 description 1
238000000746 purification Methods 0.000 description 1
UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
238000011084 recovery Methods 0.000 description 1
239000010865 sewage Substances 0.000 description 1
229910000029 sodium carbonate Inorganic materials 0.000 description 1
238000003860 storage Methods 0.000 description 1
125000001424 substituent group Chemical group 0.000 description 1
239000000758 substrate Substances 0.000 description 1
239000002344 surface layer Substances 0.000 description 1
235000013616 tea Nutrition 0.000 description 1
YCGAZNXXGKTASZ-UHFFFAOYSA-N thiophene-2,5-dicarboxylic acid Chemical class OC(=O)C1=CC=C(C(O)=O)S1 YCGAZNXXGKTASZ-UHFFFAOYSA-N 0.000 description 1
235000015193 tomato juice Nutrition 0.000 description 1
229960005486 vaccine Drugs 0.000 description 1
239000011782 vitamin Substances 0.000 description 1
229940088594 vitamin Drugs 0.000 description 1
229930003231 vitamin Natural products 0.000 description 1
235000013343 vitamin Nutrition 0.000 description 1
238000005406 washing Methods 0.000 description 1
239000002759 woven fabric Substances 0.000 description 1
239000008096 xylene Substances 0.000 description 1

Classifications

- 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
- C08G69/42—Polyamides containing atoms other than carbon, hydrogen, oxygen, and nitrogen
- 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
- 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
- C08G69/40—Polyamides containing oxygen in the form of ether groups

Landscapes

Chemical & Material Sciences (AREA)
Chemical Kinetics & Catalysis (AREA)
Health & Medical Sciences (AREA)
Medicinal Chemistry (AREA)
Polymers & Plastics (AREA)
Organic Chemistry (AREA)
Separation Using Semi-Permeable Membranes (AREA)
Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
Polyamides (AREA)

IL44761A 1973-05-07 1974-05-03 Poly-and copolypiperazinamides membranes for reverse osmosis made therefrom and their preparation IL44761A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
IT23770/73A IT987156B (it)	1973-05-07	1973-05-07	Polipiperazinammidi copolipiperazi nammidi e membrane per osmosi in versa a base di tali materiali polimerici

Publications (2)

Publication Number	Publication Date
IL44761A0 IL44761A0 (en)	1974-07-31
IL44761A true IL44761A (en)	1977-10-31

Family

ID=11209824

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
IL44761A IL44761A (en)	1973-05-07	1974-05-03	Poly-and copolypiperazinamides membranes for reverse osmosis made therefrom and their preparation

Country Status (11)

Country	Link
JP (1)	JPS575565B2 (fr)
BE (1)	BE814603A (fr)
CA (1)	CA1029496A (fr)
DE (1)	DE2421353A1 (fr)
DK (1)	DK157978C (fr)
ES (1)	ES426000A1 (fr)
FR (1)	FR2228805B1 (fr)
GB (1)	GB1422767A (fr)
IL (1)	IL44761A (fr)
IT (1)	IT987156B (fr)
NL (1)	NL176176C (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
IT1040274B (it) *	1975-07-30	1979-12-20	Consiglio Nazionale Ricerche	Procedimento di preparazione di membrane anisotrope supportate per osmosi inversa a base di poliammidi sintetiche
US4433117A (en) *	1982-03-23	1984-02-21	Kuraray Co., Ltd.	Copolyesteramide and production of the same

1973
- 1973-05-07 IT IT23770/73A patent/IT987156B/it active
1974
- 1974-05-02 NL NLAANVRAGE7405900,A patent/NL176176C/xx not_active IP Right Cessation
- 1974-05-02 DK DK240274A patent/DK157978C/da active
- 1974-05-03 DE DE2421353A patent/DE2421353A1/de not_active Withdrawn
- 1974-05-03 IL IL44761A patent/IL44761A/en unknown
- 1974-05-04 JP JP4929974A patent/JPS575565B2/ja not_active Expired
- 1974-05-06 FR FR7415547A patent/FR2228805B1/fr not_active Expired
- 1974-05-06 BE BE143969A patent/BE814603A/fr unknown
- 1974-05-06 ES ES426000A patent/ES426000A1/es not_active Expired
- 1974-05-07 GB GB1994674A patent/GB1422767A/en not_active Expired
- 1974-05-07 CA CA199,175A patent/CA1029496A/fr not_active Expired

Also Published As

Publication number	Publication date
IT987156B (it)	1975-02-20
NL176176C (nl)	1985-03-01
BE814603A (fr)	1974-11-06
DE2421353A1 (de)	1974-11-21
NL176176B (nl)	1984-10-01
DK157978C (da)	1990-08-27
FR2228805B1 (fr)	1976-12-17
IL44761A0 (en)	1974-07-31
JPS5081978A (fr)	1975-07-03
JPS575565B2 (fr)	1982-01-30
DK157978B (da)	1990-03-12
CA1029496A (fr)	1978-04-11
GB1422767A (en)	1976-01-28
FR2228805A1 (fr)	1974-12-06
NL7405900A (fr)	1974-11-11
ES426000A1 (es)	1976-11-01

Publication	Publication Date	Title
US4606943A (en)	1986-08-19	Method for preparation of semipermeable composite membrane
US4259183A (en)	1981-03-31	Reverse osmosis membrane
CA1076427A (fr)	1980-04-29	Methode de preparation de membranes anisotropes supportees destinees a l'exosmose, et basees sur des polyamides synthetiques
US4217227A (en)	1980-08-12	Semipermeable membranes of copolyamides
US4269967A (en)	1981-05-26	Semipermeable membranes of aromatic disulfimide containing polyamides
US5152894A (en)	1992-10-06	Semipermeable membrane made from a homogeneously miscible polymer blend
JPH0565213B2 (fr)	1993-09-17
US4221903A (en)	1980-09-09	Semipermeable membranes of heterocyclic copolyamides
AU758752B2 (en)	2003-03-27	Pervaporation device and irrigation mat
US4069215A (en)	1978-01-17	Semipermeable membranes of sulphonated polybenz-1,3-oxazin-2,4-diones
US3619424A (en)	1971-11-09	Semipermeable membranes
CA1101161A (fr)	1981-05-19	Traduction non-disponible
US4129559A (en)	1978-12-12	Reverse osmosis anisotropic membranes based on polypiperazine amides
US4123424A (en)	1978-10-31	Polymeric piperazinamides and membranes for reverse osmosis made therefrom
Chen et al.	1973	Formalized poly (vinyl alcohol) membranes for reverse osmosis
US4410568A (en)	1983-10-18	Process for preparing selective permeable membrane
JPH0559776B2 (fr)	1993-08-31
IL44761A (en)	1977-10-31	Poly-and copolypiperazinamides membranes for reverse osmosis made therefrom and their preparation
JPS5850521B2 (ja)	1983-11-11	ポリキナゾロン系重合体よりなる選択性透過膜
JPS6225402B2 (fr)	1987-06-03
EP0099686B1 (fr)	1989-09-20	Procédé pour la préparation de membranes anisotropes en polypipérazinamide
GB2139113A (en)	1984-11-07	Reverse osmosis membrane and method for the preparation thereof
JPH07114942B2 (ja)	1995-12-13	選択透過性膜
JPS5820647B2 (ja)	1983-04-25	透水性のすぐれた限外「ろ」過膜の製造法
JPH0628710B2 (ja)	1994-04-20	選択透過性膜