EP1724000A1 - Kompositmembran mit dünner fluorhaltiger Polymerschicht - Google Patents

Kompositmembran mit dünner fluorhaltiger Polymerschicht Download PDF

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Publication number
EP1724000A1
EP1724000A1 EP06252601A EP06252601A EP1724000A1 EP 1724000 A1 EP1724000 A1 EP 1724000A1 EP 06252601 A EP06252601 A EP 06252601A EP 06252601 A EP06252601 A EP 06252601A EP 1724000 A1 EP1724000 A1 EP 1724000A1
Authority
EP
European Patent Office
Prior art keywords
layer
membrane
fluorine containing
primer
coating
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.)
Granted
Application number
EP06252601A
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English (en)
French (fr)
Other versions
EP1724000B1 (de
Inventor
Thomas Edward Frankel
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.)
Frankel Thomas Edward
Hong-suk Kim
Kang Seoungil
RITTER, TODD DAVID
Original Assignee
Frankel Thomas Edward
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 KR1020050041410A external-priority patent/KR100666937B1/ko
Priority claimed from US11/164,729 external-priority patent/US7674514B2/en
Application filed by Frankel Thomas Edward filed Critical Frankel Thomas Edward
Publication of EP1724000A1 publication Critical patent/EP1724000A1/de
Application granted granted Critical
Publication of EP1724000B1 publication Critical patent/EP1724000B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B01F23/231244—Dissolving, hollow fiber membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23126—Diffusers characterised by the shape of the diffuser element
    • B01F23/231262—Diffusers characterised by the shape of the diffuser element having disc shape

Definitions

  • the present application relates to membrane layers.
  • Spray coating methods of applying fluorine containing dispersions onto substrates such as EPDM and Nitrile rubber already exist. They are typically combined with primers such as but not limited to polyamide-imide, polyether sulfones and sprayed onto a substrate that may have been pretreated with. Methyl-ethyl Ketone, N-Methyl Pyrrolidone, plasma or corona treatment to improve adhesion of the primer to the substrate. Following surface preparation and priming, they are coated with a fluorine containing dispersion coating, and are then cured on-line or off-line in an oven. However such methods have not previously been applied to a diffuser membrane for use in water treatment plants, which is a difficult application.
  • Diffuser membranes are typically made from perforated non-fluorinated elastomers or polymers, which are perforated with small slits and, when inflated, produce a plume of bubbles which are released into waste water.
  • the efficacy of such diffusers is measured primarily in their ability to produce small bubbles in great quantity, such that the combined surface area of the bubbles is large. A large quantity of small bubbles transfers much more oxygen to the process than do a smaller quantity of large bubbles and oxygen mass transfer is desirable.
  • diffusers typically spend a great deal of time and energy formulating elastomeric compounds that produce small bubbles, The slightest compound formulation change may result in a vastly different bubble size.
  • surface contamination from foulants such as biofilm, calcium and gypsum can cause an increase in bubble size over time, just as fats, oils, greases and solvents can penetrate traditional membranes causing chemical oxidation of the rubber. This can result in either a failed part or increased bubble size.
  • the coating of a non fluorine containing membrane with a smooth fluorinated layer that is specifically designed to produce small bubbles, and to withstand thousands of perforations and a constant state of flux while submerged in waste water, is a novel invention and provides a universal solution to both fouling and efficiency issues.
  • aspects of the present invention apply to flexible diffuser membranes which are used in the aeration of waste water and which is spray coated with a fluorine containing surface layer.
  • a diffuser membrane is produced from blended EPDM rubber, Nitrite rubber, or Neoprene rubber, the surface is roughened either through corona, plasma, or Methyl-ethyl Ketone, and a primer and fluorine containing surface layer are applied through spray coating. Alternately a blended primer and fluorine containing surface layer are applied through spray coating.
  • the membrane When treated in this way, the membrane becomes significantly more resistant to surface fouling, chemical oxidation, and its oxygen transfer efficiency is acceptably high by industry standards.
  • Adhesion between a spray coated fluorine containing layer and a substrate is accomplished through substrate surface treatment, priming, coating and curing.
  • a substrate layer such as membrane 3 is moulded.
  • a roughing agent such as corona, plasma, methyl-ethyl ketone or N-Methyl Pyrrolidone is applied to the surface to be coated as needed depending on the quality of the substrate.
  • a primer layer 2 of less than 10 microns is sprayed onto the substrate surface. This primer is then heat treated at 100 degrees C for 15 minutes.
  • the primer layer may contain Polyamide-Imide or Polyether Sulfone. Alternately, the primer is blended with a fluorine containing dispersion layer and this layer is sprayed onto the substrate surface, then heat treated.
  • the fluorine containing dispersion layer 1 of less than 20 microns is sprayed over the cured primer, and is heat treated at 120 degrees C for 20 minutes.
  • the fluorine containing dispersion layer may contain fluoride acryl resin, xylene, toluene, bentonite, titanium dioxide, carbon black, 2-lsocyanatoethyl 2, 6-diisocyanatohexanoate, 2, 6-Diisocyanatohexanoic acid 2-isocyanatoethyl ester and/or ethyl acetate.
  • This invention is about the multi-layered membrane of disk typed and tube typed membrane air diffuser.
  • This system can be installed in the aeration tanks of the sewage and waste water treatment system that is used to make the air, which was supplied from the blower, fine bubbles to spray them so that the oxygen in the air can be efficiently dissolved into the sewage and waste water.
  • this system analyses and removes the biochemical oxygen demand and suspended solids biologically, and enables to be appropriately mixed so that the sedimentation within the aeration tank can be prevented.
  • the purpose of the invention is a device that sprays the air, taken from a blower, through the membrane infinitesimally for various processes that supply oxygen to the micro organisms in an aeration tank to purify waste and related processes where sewage and waste waters are biologically processed.
  • the membrane used for this purpose are the ones composed of single material and single layer such as EPDM, SILICON and NITRIL.
  • the membrane may be manufactured by coating the PTFE on the multi layer structure or both surfaces of the conventional EPDM or NITRIL membrane (MEMBRANE 22), so that the acid-resistance, resistance to chemical, heat resistance, and the function that can prevent foreign elements from being adhered, which are the functions not owned by EPDM and NITRIL membrane, can be provided.
  • This invention coats PTFE on both surfaces of membrane whose main material is EPDM or Nitril. It adds the characteristics of PTFE based on the physical property of EPDM membrane so that the functions and durability of the membrane within the sewage and waste water can increase.
  • the PTFE coating layer is likely to peel from the EPDM surface if there is no pre-treatment
  • the layer was processed through a hardening process from heat treatment so that PTFE coating layer should not rise during the manufacturing process of bending the layer or punching a pore.
  • the air diffuser of PTFE coating membrane of this invention has the characteristics as follows, it prevents suspended solids from being adhered under water during a process where air is sprayed within the aeration tank of the sewage and surface water treatment system. Also, it has superior acid resistances and strong resistance to chemical.
  • Figs. 4 to 6 provide illustrations of a practical example according to this invention as shown below.
  • the compositions of the membrane air diffuser according to this invention are represented.
  • the multi layered membrane (membrane 13) is assembled into the air diffuser (Base 11) and this assemble is tightened by a retaining nut (retaining nut 12).
  • the multilayered membrane (membrane 13) tightened by a retaining nut and expanded by the air supplied through the orifice of the air diffuser base and at this time many slits, which were made by punching over the effective surface of the membrane, are opened while vomiting equal fine bubbles of 1-2mm sizes.
  • the air diffuser of multi layer membrane of PFTE has the following effects; it has strong resistance to chemical substances of strong corrosiveness flown into along with sewage or waste water. Also, it is safely prevented from the suspended solids such as CaC1 2 that is easily adhered to the EPDM membrane surface, and it has acid resistance.
  • the membrane can be used in a number of applications and for example.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Laminated Bodies (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
EP06252601A 2005-05-18 2006-05-18 Verfahren zur Herstellung einer Kompositmembran mit dünner fluorhaltiger Polymerschicht Active EP1724000B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020050041410A KR100666937B1 (ko) 2005-05-18 2005-05-18 다층 구조의 산기관용 멤브레인
US11/164,729 US7674514B2 (en) 2005-12-02 2005-12-02 Multiple layered membrane with thin fluorine containing polymer layer

Publications (2)

Publication Number Publication Date
EP1724000A1 true EP1724000A1 (de) 2006-11-22
EP1724000B1 EP1724000B1 (de) 2011-03-16

Family

ID=36930236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06252601A Active EP1724000B1 (de) 2005-05-18 2006-05-18 Verfahren zur Herstellung einer Kompositmembran mit dünner fluorhaltiger Polymerschicht

Country Status (3)

Country Link
EP (1) EP1724000B1 (de)
AT (1) ATE501783T1 (de)
DE (1) DE602006020656D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011127914A1 (de) * 2010-04-15 2011-10-20 Ott Friederike Begasungseinrichtung zum einbringen eines gases in eine flüssigkeit
CN104707496A (zh) * 2010-08-18 2015-06-17 三菱日立电力系统株式会社 通风装置及具备该装置的海水烟气脱硫装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2051091A (en) * 1979-02-16 1981-01-14 Fluorocoat Ltd Fluorocarbon Polymer Compositions and Method of Spray-coating
US5238471A (en) * 1992-10-14 1993-08-24 E. I. Du Pont De Nemours And Company Spray-applied fluoropolymer films for gas separation membranes
US6410084B1 (en) * 1999-02-12 2002-06-25 Bha Technologies, Inc. Porous membrane structure and method
US20030207118A1 (en) * 2002-04-18 2003-11-06 3M Innovative Properties Company Adhesion and bonding of multi-layer articles including a fluoropolymer layer
US6648147B1 (en) * 1998-05-23 2003-11-18 Madison Filter 981 Limited Phase-separation member
US20050003204A1 (en) * 2004-09-28 2005-01-06 Thomas Frankel Mutiple layered membrane with fluorine containing polymer layer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2051091A (en) * 1979-02-16 1981-01-14 Fluorocoat Ltd Fluorocarbon Polymer Compositions and Method of Spray-coating
US5238471A (en) * 1992-10-14 1993-08-24 E. I. Du Pont De Nemours And Company Spray-applied fluoropolymer films for gas separation membranes
US6648147B1 (en) * 1998-05-23 2003-11-18 Madison Filter 981 Limited Phase-separation member
US6410084B1 (en) * 1999-02-12 2002-06-25 Bha Technologies, Inc. Porous membrane structure and method
US20030207118A1 (en) * 2002-04-18 2003-11-06 3M Innovative Properties Company Adhesion and bonding of multi-layer articles including a fluoropolymer layer
US20050003204A1 (en) * 2004-09-28 2005-01-06 Thomas Frankel Mutiple layered membrane with fluorine containing polymer layer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011127914A1 (de) * 2010-04-15 2011-10-20 Ott Friederike Begasungseinrichtung zum einbringen eines gases in eine flüssigkeit
CN104707496A (zh) * 2010-08-18 2015-06-17 三菱日立电力系统株式会社 通风装置及具备该装置的海水烟气脱硫装置

Also Published As

Publication number Publication date
EP1724000B1 (de) 2011-03-16
DE602006020656D1 (de) 2011-04-28
ATE501783T1 (de) 2011-04-15

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