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WO2015065498A1 - Tissu support de perméat pour filtres à membrane - Google Patents

Tissu support de perméat pour filtres à membrane Download PDF

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Publication number
WO2015065498A1
WO2015065498A1 PCT/US2013/068871 US2013068871W WO2015065498A1 WO 2015065498 A1 WO2015065498 A1 WO 2015065498A1 US 2013068871 W US2013068871 W US 2013068871W WO 2015065498 A1 WO2015065498 A1 WO 2015065498A1
Authority
WO
WIPO (PCT)
Prior art keywords
permeate carrier
carrier fabric
monofilament
yarns
filter
Prior art date
Application number
PCT/US2013/068871
Other languages
English (en)
Inventor
Robert Charles EARHART
Monty HODGES
Original Assignee
Glen Raven, Inc.
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 US14/069,778 external-priority patent/US9636637B2/en
Application filed by Glen Raven, Inc. filed Critical Glen Raven, Inc.
Priority to KR1020147022366A priority Critical patent/KR101647909B1/ko
Publication of WO2015065498A1 publication Critical patent/WO2015065498A1/fr

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/027—Nanofiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/145—Ultrafiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/147—Microfiltration
    • 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
    • B01D69/105—Support pretreatment
    • 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
    • B01D69/1216—Three or more layers
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
    • D04B1/16—Other fabrics or articles characterised primarily by the use of particular thread materials synthetic threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0208—Single-component fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0216—Bicomponent or multicomponent fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/14—Specific spacers
    • B01D2313/143—Specific spacers on the feed side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/14—Specific spacers
    • B01D2313/146—Specific spacers on the permeate side
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]

Definitions

  • This invention relates to permeate carrier fabrics for membrane filters, such as reverse osmosis filters, ultrafiltration filters and other types of membrane filters.
  • membrane filters such as reverse osmosis filters, ultrafiltration filters and other types of membrane filters.
  • Such filters are now in use in many applications for high-efficiency liquid filtration.
  • Such membrane filters appear in spiral wound elements and are used with reverse osmosis filtration systems, micro filtration systems, nanofiltration systems, as well as ultrafiltration systems.
  • such membrane filters generally comprise spiral wound elements made of three components, the membrane, the permeate carrier fabric, and the feed spacer.
  • the membrane is the part of the element where the separation occurs and can be either a reverse osmosis, nanofiltration, ultrafiltration, or microfiltration type membrane.
  • the feed spacer separates two adjacent membrane faces and acts as a spacer and also a turbulence promoter.
  • the permeate carrier fabric is placed between layers of the membrane and acts as a pipe to allow the permeate to flow between the adjacent membranes and exit from the element.
  • a composite is made which consists of a first membrane layer, an intermediate permeate carrier fabric, and a second membrane layer.
  • These three components are glued or sonically welded together on three sides, and numerous layers of these three-part composites are each glued around a perforated filter core.
  • the spacer fabric is used between each layer of composite.
  • the layers are rolled around the core to a certain diameter based on the size/diameter of the filter. This element is then placed in a cylindrical container.
  • the purpose of the permeate carrier fabric is to provide direction for and channel the flow of the liquid. It is therefore important that the yarns in the fabric be sufficiently stiff or firm to prevent collapse.
  • the permeate carrier fabric is generally a knitted polyester tricot fabric. This fabric, as stated above, is placed between permeable membranes. Tricot knitted fabric has been found to be a particular desirable structure for supporting the membrane material due to the porous knitted structure and raised rows of stitches which define between them long, continuous passageways akin to corrugation through which the liquid being filtered flows. However, other types of fabric may also be used as the permeate carrier, including other types of knitted fabric or even, woven fabric.
  • the permeate carrier fabric should have a low pressure drop (high permeability) for the permeate flow while being able to withstand the high pressures exerted by the liquid being filtered without compaction.
  • permeate carrier fabrics In the past, there have generally been two types of permeate carrier fabrics.
  • One type are knit fabrics of multifilament polyester yarns, which yarns are then coated with a resin to add firmness to the fabric.
  • the other type of permeate fabric are fabrics made with bi-component yarns having a regular polyester core and a low melt polyester sheath. This sheath part of the yarn is melted during finishing to give the yarn its necessary firmness. Resin applied to add firmness to the resin coated yarns also tends to partially block the fabric channels thereby restricting part of the permeate flow. When the yarns in the bi-component fabrics are melted, again, the same result occurs, the channels are again partially blocked restricting the permeate flow. Summary of the Invention
  • “monofilament” yarn is to be distinguished from a bi-component yarn having a core and sheath and is intended to mean a single, relatively thicker filament yarn that is uncoated and unsheathed.
  • An example is fishing line. Since
  • the permeate carrier fabric comprising at least some monofilament polyester (or nylon) yarns will be used as a channeling fabric between two layers of the membrane. It is important that the yarns forming the channels in the fabric be firm enough to withstand the filter pressure without collapsing. The addition of a monofilament yarn provides the necessary firmness needed to withstand filter pressure conditions.
  • Such a permeate carrier fabric optimizes the design, cost and efficiency of the finished filter.
  • the monofilament yarns used in the permeate carrier fabric there is less further processing required, a firmer permeate carrier fabric results, with a lower cost, and the channels in the fabric are wider for better permeate flow.
  • the permeate carrier fabrics according the present invention may have varying wale counts, thickness, and weights. They may be made with (a) 100% monofilament yarns, (b) monofilament yarns and other spun or multifilament yarns, or (c) monofilament yarns partnered with some bi- component yarns. It is possible that a manufacturer might want to use a small amount of resin with either embodiment (a) or (b) to prevent yarn slippage or to make further processing of a composite or filter easier. However, these would be only small amounts of resin, significantly less than used in the coating processes of prior approaches.
  • the permeate carrier fabric of the present invention may be knit or woven, the preferred approach is a warp knit, preferably tricot, in which at least one of the yarns is a monofilament yarn of between 10 and 40 denier.
  • the wale and course count may vary based on filter performance, but the wale count should be between 20 and 70 per inch and the course count should also be between 20 and 70 courses per inch.
  • the monofilament yarn is preferably formed of polyester, but could possibly be nylon. Where the fabric is made on a warp knitting machine, the machine may be either a 2, 3, or 4 bar machine.
  • the monofilament concept can be present in a range of fabrics including (1) 100% monofilament yarns, (2) monofilament yarns and other spun or multifilament yarns, or (3) monofilament yarns partnered with bi-component yarns, where the machine is a 2 bar, 3 bar, or 4 bar machine, one or more of the bars could carry the monofilament yarn and the other bar(s) could carry the other type yarn.
  • monofilament yarns are used without bi-component yarns, a small amount of resin may be added to the knit fabric. The resin is provided in order to prevent sliding or slipping of yarns with respect to one another. The amount of resin is insufficient to provide significant additional rigidity or support to the fabric.
  • a trial sample of permeate carrier fabric was prepared using a combination of (1) 70 denier 24 filament bi-component, polyester yarn ends and (2) 20 denier monofilament polyester yarn ends.
  • the bi-component yarn ends were set up on the top bar of a 2 bar tricot knitting machine and the monofilament yarn ends were set up on the bottom bar of the machine.
  • the top bar used a 2/3, 1/0 pattern and the lower bar used a 1/0, 1/2 pattern.
  • Each beam included 1,340 ends with final fabric targets of 60 wales per inch, 50 courses per inch and a weight of 3.87 ounces per square yard.
  • the resulting fabric was spit into two 40" panels and weighed 4. 16 ounces per square yard.
  • a second trial fabric was made using the same yarns as Example 1 but the finished fabric targeted a wale count of 46 wales per inch.
  • the resulting fabric weighed 3.23 oz/yd 2 .
  • a third trial fabric was made; again using the same yarns as Example 1 , but the set-up used a targeted wale count of 35 wales per inch.
  • the resulting fabric had a weight of 2.45 oz/yd 2 .
  • Example 1 A test was run in which the fabric of Example 1 was pressure tested against a conventional tricot knitted fabric formed with all 70 denier 24 filament bi-component polyester and 50 denier 24 filament bi-component polyester.
  • the 70 denier yarns ends were set up on the top beams of a tricot knitting machines in which the top bar used a 2/3, 1/0 patters, and the 50 denier yarn ends were set up on the bottom bar using a 1 /0, 1 /2 pattern.
  • the two fabrics were placed between adjacent reverse osmosis membranes and tested at various water pressures. The lateral permeability of the two fabrics were measured at pressure differentials; and the fabric of Example 1 showed an improvement in permeability of approximately 30% depending on the pressure differential applied.
  • the two samples were both effective to support the membranes,

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Supply & Treatment (AREA)
  • Textile Engineering (AREA)
  • Nanotechnology (AREA)
  • Knitting Of Fabric (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention concerne un tissu support de perméat comprenant au moins quelques fils synthétiques monofilaments pour procurer une rigidité adéquate et réduire le blocage du flux de perméat. L'invention concerne des tissus support de perméat pour filtres à membrane, tels que des filtres à osmose inverse, des filtres à ultrafiltration et d'autres types de filtres à membrane. Ces filtres sont actuellement utilisés dans de nombreuses applications pour la filtration de haute efficacité de liquides. Ces filtres à membrane existent sous forme d'éléments enroulés en spirale et sont utilisés avec des systèmes de filtration à osmose inverse, des systèmes de microfiltration, des systèmes de nanofiltration ainsi que des systèmes d'ultrafiltration.
PCT/US2013/068871 2013-11-01 2013-11-07 Tissu support de perméat pour filtres à membrane WO2015065498A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020147022366A KR101647909B1 (ko) 2013-11-01 2013-11-07 막 필터용 투과액 캐리어 직물

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14/069,778 2013-11-01
US14/069,778 US9636637B2 (en) 2012-06-13 2013-11-01 Permeate carrier fabric for membrane filters

Publications (1)

Publication Number Publication Date
WO2015065498A1 true WO2015065498A1 (fr) 2015-05-07

Family

ID=53004889

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2013/068871 WO2015065498A1 (fr) 2013-11-01 2013-11-07 Tissu support de perméat pour filtres à membrane

Country Status (2)

Country Link
KR (1) KR101647909B1 (fr)
WO (1) WO2015065498A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6844533B2 (ja) * 2016-01-29 2021-03-17 東レ株式会社 流路材
US11707717B2 (en) 2018-07-27 2023-07-25 Lg Chem, Ltd. Separator leaf, and spiral wound module and device comprising same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5652057A (en) * 1995-03-31 1997-07-29 Hoechst Trevira Gmbh & Co. Kg High strength core-sheath monofilaments for technical applications
US20030034294A1 (en) * 2001-05-25 2003-02-20 Dutton Floyd Greene Non-fouling epoxy resin system for permeate carrier reverse osmosis membrane
US6599849B1 (en) * 2000-06-23 2003-07-29 Milliken & Company Knitted fabric-elastomer composite preferable for transfer or film-coating
US6767498B1 (en) * 1998-10-06 2004-07-27 Hills, Inc. Process of making microfilaments
WO2005070524A1 (fr) * 2004-01-09 2005-08-04 Trisep Corporation Filtration au moyen de cartouches a membranes enroulees en spirale a faible energie, haut debit et faible encrassement
US20080164208A1 (en) * 2004-08-11 2008-07-10 Wim Doyen Integrated Permeate Channel Membrane

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5652057A (en) * 1995-03-31 1997-07-29 Hoechst Trevira Gmbh & Co. Kg High strength core-sheath monofilaments for technical applications
US6767498B1 (en) * 1998-10-06 2004-07-27 Hills, Inc. Process of making microfilaments
US6599849B1 (en) * 2000-06-23 2003-07-29 Milliken & Company Knitted fabric-elastomer composite preferable for transfer or film-coating
US20030034294A1 (en) * 2001-05-25 2003-02-20 Dutton Floyd Greene Non-fouling epoxy resin system for permeate carrier reverse osmosis membrane
WO2005070524A1 (fr) * 2004-01-09 2005-08-04 Trisep Corporation Filtration au moyen de cartouches a membranes enroulees en spirale a faible energie, haut debit et faible encrassement
US20080164208A1 (en) * 2004-08-11 2008-07-10 Wim Doyen Integrated Permeate Channel Membrane

Also Published As

Publication number Publication date
KR101647909B1 (ko) 2016-08-11
KR20160068612A (ko) 2016-06-15

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