WO1997027934A1 - Kompositmembran aus einer insbesondere mikroporösen trägermembran - Google Patents
Kompositmembran aus einer insbesondere mikroporösen trägermembran Download PDFInfo
- Publication number
- WO1997027934A1 WO1997027934A1 PCT/DE1997/000133 DE9700133W WO9727934A1 WO 1997027934 A1 WO1997027934 A1 WO 1997027934A1 DE 9700133 W DE9700133 W DE 9700133W WO 9727934 A1 WO9727934 A1 WO 9727934A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- composite membrane
- water
- membrane according
- membrane
- separating layer
- Prior art date
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 53
- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 239000012229 microporous material Substances 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000004132 cross linking Methods 0.000 claims abstract description 4
- 229920002678 cellulose Polymers 0.000 claims abstract 5
- 239000001913 cellulose Substances 0.000 claims abstract 5
- ZNZYKNKBJPZETN-WELNAUFTSA-N Dialdehyde 11678 Chemical compound N1C2=CC=CC=C2C2=C1[C@H](C[C@H](/C(=C/O)C(=O)OC)[C@@H](C=C)C=O)NCC2 ZNZYKNKBJPZETN-WELNAUFTSA-N 0.000 claims abstract 3
- 238000000926 separation method Methods 0.000 claims description 11
- 239000004697 Polyetherimide Substances 0.000 claims description 10
- 229920001601 polyetherimide Polymers 0.000 claims description 10
- 101100290380 Caenorhabditis elegans cel-1 gene Proteins 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 238000007654 immersion Methods 0.000 claims description 7
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 claims description 4
- -1 hydroxypropyl Chemical group 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims 2
- HHVIBTZHLRERCL-UHFFFAOYSA-N sulfonyldimethane Chemical compound CS(C)(=O)=O HHVIBTZHLRERCL-UHFFFAOYSA-N 0.000 claims 2
- 229920002492 poly(sulfone) Polymers 0.000 claims 1
- 229920002379 silicone rubber Polymers 0.000 claims 1
- 239000004945 silicone rubber Substances 0.000 claims 1
- 229920002554 vinyl polymer Polymers 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 12
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- YLGXILFCIXHCMC-JHGZEJCSSA-N methyl cellulose Chemical compound COC1C(OC)C(OC)C(COC)O[C@H]1O[C@H]1C(OC)C(OC)C(OC)OC1COC YLGXILFCIXHCMC-JHGZEJCSSA-N 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 3
- 150000001299 aldehydes Chemical class 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 238000012695 Interfacial polymerization Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 229960004667 ethyl cellulose Drugs 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000012264 purified product Substances 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/268—Drying gases or vapours by diffusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
-
- 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
-
- 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
- B01D71/08—Polysaccharides
- B01D71/12—Cellulose derivatives
- B01D71/22—Cellulose ethers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249978—Voids specified as micro
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249987—With nonvoid component of specified composition
- Y10T428/249991—Synthetic resin or natural rubbers
Definitions
- the invention relates to a composite membrane composed of a microporous carrier membrane in particular and a separating layer applied thereon, a process for its production and the use of this composite membrane for separating water vapor from gas mixtures.
- Absorption processes such as gas drying using glycol scrubbers (TEG, DEG), are used on a large industrial scale to process natural gas.
- TOG glycol scrubbers
- DEG glycol scrubbers
- a disadvantage of this known absorption process is the complex process control, which entails a high level of personnel and high investment costs.
- corrosion and fouling, especially in the heat exchangers lead to problems when operating these known processes.
- Glycol also causes losses and the necessary additives, such as defoamers and chemicals for pH adjustment, cause additional costs.
- adsorbents for example molecular sieves or silica gel
- the adsorbent is loaded with water in the first step and regenerated in a second, with the help of heat, pressure changes or a dry gas stream.
- This known method is particularly suitable for drying low-loaded streams. In addition, particularly low residual moisture levels can be achieved.
- a disadvantage of this known method is the fact that the adsorbent must be regenerated cyclically, so that the process is carried out discontinuously is.
- this known method for the separation of high water loads is too expensive.
- Refrigeration dryers are used for the continuous separation of water vapor from gas mixtures.
- the dew points that can be achieved are approximately 2 ° C. since the cooling coils start to freeze below this temperature.
- lower dew points can be achieved with two devices connected in parallel, one of which is automatically defrosted.
- this mode of operation requires a high investment cost and an additional energy requirement. The limits of use of this known method are therefore close to the freezing point.
- the membrane processes known to date can also be used to dehumidify larger amounts of gas.
- the membrane separation there are always two outlet streams, namely the purified product stream and the water-laden permeate stream. Depending on the application, these streams can be fed back into the process or else discarded. In any case, a high permeate flow leads to increased operating costs.
- the object of the present invention is to provide a new membrane which has high separation factors, has good mechanical and chemical stability and can be used to separate water vapor from gas mixtures. This task is solved by teaching the claims.
- the membrane according to the invention enables the selective separation of water vapor from gas mixtures.
- the membrane according to the invention thus has a high flux density for water vapor and a very low one Flux density for other gases (e.g. N «, 0«, CO «, CH.). This leads to a particularly high selectivity, which results in only minor product losses.
- the membrane area required is small or small.
- the membrane according to the invention can be used, for example, in the drying of natural gas before it is fed into a central pipeline network and in the treatment of compressed air. It can also be used in room air conditioning since the natural composition of the breathing air is not changed.
- Another application is the dehumidification of inert gases that are used to dry sensitive products. The inert gas consumption can be significantly reduced by a circular performance. This is partly due to the very low selectivity of the membrane according to the invention for oxygen / nitrogen.
- the mechanical stability of the membrane according to the invention is achieved by the construction as a composite membrane and thus from different materials.
- the high separation factors and also the flow rate are achieved by the polymers used according to the invention.
- the polymers used according to the invention which were originally water-soluble and then made water-insoluble, for example by crosslinking with one or more di aldehyde (s), are Cel 1 ul osederi vate.
- Cel 1 ul oseether in particular hydroxyethyl cellulose and hydroxypropylcel 1 ul ose, are preferably used.
- a membrane with a selective separation layer based on these cellulose ethers is stable against condensates.
- the membrane according to the invention can also be easily produced by an immersion process. There is therefore no need for complex interfacial polymerizations, as is the case with the known membranes.
- the coating of the carrier membrane used can already be formed during the precipitation process of the carrier membrane by adding the membrane polymer into the precipitation bath.
- the selectivity for the separation of water vapor / gas can be set up to a value of 20,000 as required by the choice of the coating thickness and thus the selective separation layer.
- the membrane according to the invention is also inexpensive to produce, since commercially available polymers can be used.
- a microporous PEI (polyetherimide) membrane is coated in an immersion bath.
- the coating solution consists of 39.66% ethanol, 60% water, 0.24% glutardialdehyde and 0.1% ethyl cell ulose (Tylose 4000).
- the membrane is dried at a temperature of 70 ° C in an oven and crosslinked.
- the membrane is provided with a thin silicone layer. This second layer protects the extremely thin ethyl cel 1 ul and closes small pores.
- a microporous polyetherimide membrane is coated in an immersion bath.
- the coating solution consists of 37.2% ethanol, 61.9% water, 0.6% GI utardi al dehyd and 0.3% hydroxyethyl cel 1 ulose (Tylose H4000). Otherwise the procedure is as described in Example 1. The following permeabilities were determined for this membrane:
- a microporous PEI (polyetherimide) membrane is coated in an immersion bath.
- the coating solution consists of 37.61% ethanol, 62.05% water, 0.24% GI utardi aldehyde and 0.1% hydroxyethyl cell ul ose (Tylose 4000). Otherwise the procedure is as described in Example 1. The following permeabilities were determined for this membrane:
- a microporous PEI (polyetherimide) membrane is coated in an immersion bath.
- the coating solution consists of 39.65% ethanol, 60.0% water, 0.25% GI utardi aldehyde and 0.1% hydroxyethyl cel 1 ul ose (Tylose 10000). Otherwise the procedure is as described in Example 1. The following permeabilities were determined for this membrane:
- PEI polyetherimide
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97914083A EP0880400A1 (de) | 1996-01-31 | 1997-01-24 | Kompositmembran aus einer insbesondere mikroporösen trägermembran |
US09/126,297 US6277483B1 (en) | 1996-01-31 | 1998-07-30 | Composite membrane with support structure made of microporous material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19603420.5 | 1996-01-31 | ||
DE19603420A DE19603420C1 (de) | 1996-01-31 | 1996-01-31 | Kompositmembran aus einer insbesondere mikroporösen Trägermembran |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/126,297 Continuation-In-Part US6277483B1 (en) | 1996-01-31 | 1998-07-30 | Composite membrane with support structure made of microporous material |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997027934A1 true WO1997027934A1 (de) | 1997-08-07 |
Family
ID=7784133
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1997/000133 WO1997027934A1 (de) | 1996-01-31 | 1997-01-24 | Kompositmembran aus einer insbesondere mikroporösen trägermembran |
Country Status (4)
Country | Link |
---|---|
US (1) | US6277483B1 (de) |
EP (1) | EP0880400A1 (de) |
DE (1) | DE19603420C1 (de) |
WO (1) | WO1997027934A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19739144C2 (de) * | 1997-09-06 | 2002-04-18 | Geesthacht Gkss Forschung | Vorrichtung zur Entfernung von Wasserdampf aus unter Druck befindlichen Gasen oder Gasgemischen |
US6860772B2 (en) * | 2000-01-10 | 2005-03-01 | Vladimir M. Kabakov | Transverse watercraft propeller |
WO2002094555A1 (de) * | 2001-05-22 | 2002-11-28 | Membrana Gmbh | Laminat, verfahren zu seiner herstellung und das laminat enthaltende bekleidungsstücke |
CA2493605A1 (en) * | 2001-07-25 | 2003-02-06 | Richard A. Haase | Processes and apparatus for the manufacture of polynuclear aluminum compounds and disinfectants, and polynuclear aluminum compounds and disinfectants from such processes and apparatus |
US6938853B2 (en) * | 2002-03-15 | 2005-09-06 | University Of Maryland, College Park | Biomimetic mechanism for micro aircraft |
MXPA04009982A (es) | 2002-04-11 | 2006-02-22 | Richard A Haase | Metodos, procesos, sistemas y aparatos con tecnologia de combustiion de agua, para la combustion de hidrogeno y oxigeno. |
US20040206693A1 (en) * | 2003-04-16 | 2004-10-21 | John Charkoudian | Crosslinked cellulosic membrane |
US20040206694A1 (en) * | 2003-04-16 | 2004-10-21 | John Charkoudian | Epoxide-crosslinked, charged cellulosic membrane |
US7517581B2 (en) * | 2003-09-26 | 2009-04-14 | Parker-Hannifin Corporation | Semipermeable hydrophilic membrane |
US8268269B2 (en) | 2006-01-24 | 2012-09-18 | Clearvalue Technologies, Inc. | Manufacture of water chemistries |
CN103879034B (zh) * | 2013-01-30 | 2016-08-03 | 中国科学院宁波材料技术与工程研究所 | 一种高气密性全热交换膜及全热交换器 |
US9174164B2 (en) * | 2013-12-30 | 2015-11-03 | Gas Technology Institute | Apparatus for dehumidifying gas and methods of use |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2047359A1 (en) * | 1970-09-25 | 1972-05-10 | Linde Ag | Purifying gas mixture eg air - by diffusion through membranes permeable only to the impurities eg water vapour and carbon dioxide |
JPS62241527A (ja) * | 1986-04-14 | 1987-10-22 | Daicel Chem Ind Ltd | 空気の除湿方法 |
EP0272842A2 (de) * | 1986-12-23 | 1988-06-29 | Pall Corporation | Filtermembranen |
US5019261A (en) * | 1986-08-27 | 1991-05-28 | Dow Danmark A/S | Permeable, porous polymeric membrane with hydrophilic character methods for preparing said membranes and their use |
EP0481363A1 (de) * | 1990-10-11 | 1992-04-22 | Praxair Technology, Inc. | Membran Trocknungsverfahren und -Vorrichtung |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5641450A (en) * | 1991-03-28 | 1997-06-24 | Toray Industries, Inc. | Process of making a module including a polysulphonic hollow fiber membrane |
DE4217335C2 (de) * | 1992-05-26 | 1996-01-18 | Seitz Filter Werke | Hydrophile Membran und Verfahren zu ihrer Herstellung |
-
1996
- 1996-01-31 DE DE19603420A patent/DE19603420C1/de not_active Expired - Fee Related
-
1997
- 1997-01-24 EP EP97914083A patent/EP0880400A1/de not_active Withdrawn
- 1997-01-24 WO PCT/DE1997/000133 patent/WO1997027934A1/de not_active Application Discontinuation
-
1998
- 1998-07-30 US US09/126,297 patent/US6277483B1/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2047359A1 (en) * | 1970-09-25 | 1972-05-10 | Linde Ag | Purifying gas mixture eg air - by diffusion through membranes permeable only to the impurities eg water vapour and carbon dioxide |
JPS62241527A (ja) * | 1986-04-14 | 1987-10-22 | Daicel Chem Ind Ltd | 空気の除湿方法 |
US5019261A (en) * | 1986-08-27 | 1991-05-28 | Dow Danmark A/S | Permeable, porous polymeric membrane with hydrophilic character methods for preparing said membranes and their use |
US5091086A (en) * | 1986-08-27 | 1992-02-25 | Danisco A/S | Permeable, porous polymeric membrane with hydrophilic character, methods for preparing said membranes and their use |
EP0272842A2 (de) * | 1986-12-23 | 1988-06-29 | Pall Corporation | Filtermembranen |
EP0481363A1 (de) * | 1990-10-11 | 1992-04-22 | Praxair Technology, Inc. | Membran Trocknungsverfahren und -Vorrichtung |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Section Ch Week 8748, Derwent World Patents Index; Class A88, AN 87-337696, XP002033807 * |
Also Published As
Publication number | Publication date |
---|---|
EP0880400A1 (de) | 1998-12-02 |
US6277483B1 (en) | 2001-08-21 |
DE19603420C1 (de) | 1997-05-22 |
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