EP0996496A1 - Membranes poreuses a renforcement par non tisses integres - Google Patents

Membranes poreuses a renforcement par non tisses integres

Info

Publication number
EP0996496A1
EP0996496A1 EP98939624A EP98939624A EP0996496A1 EP 0996496 A1 EP0996496 A1 EP 0996496A1 EP 98939624 A EP98939624 A EP 98939624A EP 98939624 A EP98939624 A EP 98939624A EP 0996496 A1 EP0996496 A1 EP 0996496A1
Authority
EP
European Patent Office
Prior art keywords
fleece
integrally
polymer
approximately
reinforced porous
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.)
Withdrawn
Application number
EP98939624A
Other languages
German (de)
English (en)
Inventor
Hans Beer
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.)
Sartorius AG
Original Assignee
Sartorius AG
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 Sartorius AG filed Critical Sartorius AG
Publication of EP0996496A1 publication Critical patent/EP0996496A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B01D69/10—Supported membranes; Membrane supports
    • B01D69/107—Organic support material
    • B01D69/1071—Woven, non-woven or net mesh

Definitions

  • the invention relates to integrally fleece-reinforced porous membranes with improved properties.
  • the membranes according to the invention are used as filter materials in known filter modules and are suitable for the filtration of fluids, in particular liquids, in which a long service life, filtration performance and filtration reliability are important.
  • Porous membranes are to be understood as ultrafiltration and microfiltration membranes which have pores with diameters in the range from approximately 0.001 to approximately 0.1 ⁇ m or from approximately 0.01 to approximately 30 ⁇ m.
  • they are made from organic polymers.
  • Such membranes are often sensitive to breakage and have little mechanical stress.
  • porous membranes made from organic polymers are reinforced with a wide variety of carrier materials.
  • a frequently encountered group are textile-reinforced membranes, in which the reinforcement consists of a woven, knitted, fleece or a film. From the type of connection between membrane and reinforcement material, one can basically differentiate between integrally and non-integrally reinforced membranes.
  • Integrally reinforced membranes are to be understood to mean those membranes in which the still liquid membrane material is brought into contact with the reinforcement and the membrane is subsequently formed.
  • the reinforcement has at least partially penetrated the membrane or is completely enclosed by it.
  • the membrane can be reinforced on one or both sides.
  • the finished membrane is applied directly to the reinforcement, for example by lamination or by means of an adhesive
  • Integrally fleece-reinforced membranes are preferred for production and application reasons.
  • the object of the invention is therefore to find integrally fleece-reinforced porous membranes with an improved service life, filtration performance and retention capacity
  • integrally reinforced porous membranes which have reinforcing materials made of compressed nonwovens.
  • These compacted nonwovens are selected from a group of nonwovens that have a basis weight between approximately 20 to 40 g / m 2 , a thickness between approximately 90 to 170 ⁇ m and have an air permeability between approximately 1200 and 2400 1 / m 2 s at 0.002 bar
  • membranes according to the invention have a number of unexpected advantages over integrally fleece-reinforced membranes of the prior art with the same flow rate for water. For example, they have an approximately two to five times longer service life and filtration performance and a better one Retention capacity, for example for microorganisms
  • the membranes according to the invention can moreover be tested for integrity with greater certainty, since they have a bubble point which is approximately up to 40% higher and a diffusion which is reduced by a factor of 10 to 20 Filtration systems that have modules equipped with such membranes can be tested for integrity with greater certainty, which ensures a high safety standard, particularly in sensitive filtration areas, such as the pharmaceutical, biotechnological, beverage and food industries, as well as in medical and genetic engineering facilities .
  • the nonwoven fabric consists of a non-woven multicomponent nonwoven fabric, the multicomponent fibers comprising a first polymer and a second polymer such that the second polymer is present on at least a portion of the surface of the multicomponent fibers and has a softening temperature which is below that Softening temperature of the first polymer is.
  • multi-component nonwovens made from core sheath fibers are used, the core preferably being made of a solid polymer softening at a higher temperature, e.g. B. polypropylene and the sheath of a more chemically resistant thermoplastic polymer, e.g. consists of polyethylene.
  • membrane polymers which are suitable for the formation of porous membranes according to the phase inversion principle can be used as membrane polymers, namely both by the evaporation process, the precipitation bath process and by a mixed process.
  • Membrane polymers selected from the group of polysulfones, polyether sulfones, polyamides, polyacrylonitriles, cellulose hydrates and cellulose esters are particularly suitable.
  • Polyether sulfones, polyamides and cellulose acetates and nitrates or mixtures thereof are particularly preferred.
  • integrally fleece-reinforced porous membranes according to the invention can be processed as flat filters and in pleated form or as tubular membranes and can also be processed as reinforcing material for further membrane layers.
  • the invention will be explained in more detail using the exemplary embodiments below.
  • a membrane casting solution which contains 7.2% by weight of cellulose acetate is applied in a thickness of approximately 130 ⁇ m to a compacted nonwoven fabric.
  • the fiber fleece consists of core sheath fibers with a core made of polypropylene and a sheathing made of polyethylene.
  • the thickness of the nonwoven fabric is 130 ⁇ m with a basis weight of about 30 g / m 2.
  • the air permeability is about 1800 1 / m 2 s at 0.002 bar.
  • the membrane is formed on the nonwoven fabric by phase inversion according to the known evaporation process
  • the integrally fleece-reinforced membrane thus formed has a bubble point of 3.2 bar.
  • the diffusion is ⁇ 2.3 • 10 "3 ml / cm 2 min at a pressure difference of 2 bar or ⁇ 0.8 • 10 " 3 ml / cm 2 min at a pressure difference of 1.5 bar.
  • the permeability to RO water at room temperature is 14.8 ml / cm 2 min bar.
  • the service life of the membrane is 450% based on a standard membrane.
  • the service life (filtration performance) is determined as the throughput (amount of filtrate) when a 10% aqueous brown raw sugar solution is filtered through the membrane sample at 1 bar pressure difference and a filtration time of 10 minutes, based on the throughput of this solution through a standard membrane (0.45 ⁇ m membrane made of polyamide 6.6) under identical conditions
  • the service life is stated in% of the performance of the comparative filter
  • Example 2 Analogously to Example 1, an integrally fleece-reinforced membrane is produced, but instead of the compressed fiber fleece, a core sheath fiber fleece of the prior art is used Technology used. The thickness of this nonwoven is 250 microns at one
  • Basis weight of about 30 g / m 2 .
  • the air permeability is approximately 4000 1 / m 2 s
  • the comparison membrane has a bubble point of 2.8 bar.
  • the diffusion is> 34.6 * 10 "3 ml / cm 2 min at a pressure difference of 2 bar or ⁇ 13.1 • 10 "
  • the membrane has a permeability to RO water of 14.9 ml / cm 2 min bar at room temperature and has a service life of 97% of the standard membrane with filtration of 10% aqueous brown raw sugar solution.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

L'invention concerne des membranes poreuses à renforcement par non tissés intégrés, présentant des caractéristiques améliorées telles qu'une vie utile plus longue, un plus grand pouvoir filtrant et une plus grande capacité de retenue. Les membranes poreuses à renforcement par non tissés intégrés présentées disposent de matériaux de renforcement constitués de non tissés en fibres compactés qui sont choisis dans un groupe comprenant des non tissés présentant un grammage compris entre environ 20 et 40 g/m2, une épaisseur comprise entre environ 90 et 170 νm et une perméabilité à l'air comprise entre environ 1200 et 2400 l/m2s à 0,002 bars. Par rapport aux membranes de l'état antérieur, les membranes selon l'invention ont une vie utile et un pouvoir filtrant supérieurs d'environ 2 à 5 fois ainsi qu'une meilleure capacité de retenue, par exemple pour les micro-organismes, et leur intégrité peut être contrôlée avec une plus grande sécurité. Les membranes selon l'invention sont utilisées comme matériaux filtrants dans des modules filtrants connus et conviennent à la filtration de fluides, en particuliers de liquides, pour lesquels il est important d'avoir une longue vie utile, un grand pouvoir filtrant et une grande sécurité de filtration.
EP98939624A 1997-07-10 1998-07-08 Membranes poreuses a renforcement par non tisses integres Withdrawn EP0996496A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19729456 1997-07-10
DE19729456A DE19729456C1 (de) 1997-07-10 1997-07-10 Integral vliesverstärkte poröse Membranen
PCT/EP1998/004228 WO1999002247A1 (fr) 1997-07-10 1998-07-08 Membranes poreuses a renforcement par non tisses integres

Publications (1)

Publication Number Publication Date
EP0996496A1 true EP0996496A1 (fr) 2000-05-03

Family

ID=7835208

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98939624A Withdrawn EP0996496A1 (fr) 1997-07-10 1998-07-08 Membranes poreuses a renforcement par non tisses integres

Country Status (5)

Country Link
US (1) US6293411B1 (fr)
EP (1) EP0996496A1 (fr)
JP (1) JP2001509430A (fr)
DE (1) DE19729456C1 (fr)
WO (1) WO1999002247A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007014416A1 (fr) * 2005-08-04 2007-02-08 Intellectual Property Development Corporation Pty Ltd Pulverisateur
US7441667B2 (en) * 2005-12-15 2008-10-28 E.I. Du Pont De Nemours And Company Composite membranes for liquid filtration having improved uniformity and adhesion of substrate to membrane
US8678201B2 (en) * 2010-06-04 2014-03-25 Goodrich Corporation Aircraft potable water system
DE102016013019A1 (de) * 2016-10-31 2018-05-03 Sartorius Stedim Biotech Gmbh Poröses Flächengebilde, Filterelement, Verfahren zu ihrer Herstellung und ihre Verwendung
US11998879B2 (en) 2017-03-24 2024-06-04 Mitsubishi Paper Mills Limited Semipermeable membrane support
DE102018002261A1 (de) * 2018-03-19 2019-09-19 Sartorius Stedim Biotech Gmbh Filtermodul mit randverstärkter Membran, Verfahren zur Herstellung des Filtermoduls sowie dessen Verwendung
JP7032460B2 (ja) * 2020-01-28 2022-03-08 株式会社エフ・シー・シー 濾過フィルタの製造方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK170416B1 (da) * 1978-05-15 1995-08-28 Pall Corp Mikroporøs, hydrofil, hindefri, alkoholuopløselig polyamidharpiksmembran, fremgangsmåde til dens fremstilling, anvendelse af membranen i filterelementer samt harpiksstøbeopløsning til brug ved fremgangsmåden
JPS61222506A (ja) * 1985-03-29 1986-10-03 Japan Vilene Co Ltd 半透膜支持体及びその製造方法
US4894157A (en) * 1987-10-05 1990-01-16 Micron Separations, Inc. Process for producing supported celluosic membranes and products
US5108827A (en) * 1989-04-28 1992-04-28 Fiberweb North America, Inc. Strong nonwoven fabrics from engineered multiconstituent fibers
DE3928934C2 (de) * 1989-08-31 1999-04-29 Sartorius Gmbh Textilverstärktes mikroporöses Membranfilter, Verfahren zu seiner Herstellung und seine Verwendung
TW205513B (fr) * 1991-02-28 1993-05-11 Hoechst Ag
EP0641249A1 (fr) * 1992-05-18 1995-03-08 Costar Corporation Membranes microporeuses soutenues
DE4234816C1 (de) * 1992-10-15 1993-10-07 Seitz Filter Werke Textilverstärkte Membran und Verfahren zu deren Herstellung
US5433859A (en) * 1993-07-12 1995-07-18 Pall Corporation Supported microporous filtration membrane and method of using same
CA2160282A1 (fr) * 1995-02-14 1996-08-15 Michael R. Gildersleeve Ensemble a membrane supportee
DE19543954A1 (de) * 1995-11-25 1997-05-28 Sartorius Gmbh Druckstabile, poröse polymere Rohrmembran für Rohrmodule und Verfahren zu ihrer Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9902247A1 *

Also Published As

Publication number Publication date
JP2001509430A (ja) 2001-07-24
WO1999002247A1 (fr) 1999-01-21
US6293411B1 (en) 2001-09-25
DE19729456C1 (de) 1998-10-22

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