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WO2020149041A1 - Élément de membrane en spirale et son procédé de production - Google Patents

Élément de membrane en spirale et son procédé de production Download PDF

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Publication number
WO2020149041A1
WO2020149041A1 PCT/JP2019/047509 JP2019047509W WO2020149041A1 WO 2020149041 A1 WO2020149041 A1 WO 2020149041A1 JP 2019047509 W JP2019047509 W JP 2019047509W WO 2020149041 A1 WO2020149041 A1 WO 2020149041A1
Authority
WO
WIPO (PCT)
Prior art keywords
separation membrane
membrane element
membrane
coating layer
separation
Prior art date
Application number
PCT/JP2019/047509
Other languages
English (en)
Japanese (ja)
Inventor
川島　敏行
松田　英樹
Original Assignee
日東電工株式会社
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 日東電工株式会社 filed Critical 日東電工株式会社
Publication of WO2020149041A1 publication Critical patent/WO2020149041A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/10—Spiral-wound membrane modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

Definitions

  • the present invention relates to a spiral wound type membrane element and a method for producing the same.
  • Spiral type membrane element is used in the system for desalination of seawater, production of pure water, wastewater treatment, production of oilfield injection water, etc.
  • the spiral-type membrane element includes, for example, a water collecting pipe and a membrane leaf wound around the water collecting pipe.
  • the membrane leaf is composed of a spacer and multiple separation membranes.
  • the outer peripheral portions of the plurality of separation membranes are sealed with an adhesive so as to have a bag shape.
  • the sealing with the adhesive is insufficient, the raw water leaks from the raw water channel to the permeate channel, and the rejection rate decreases. Poorly sealed products can be found in pre-shipment inspections. However, there may be a very small amount of leak that cannot be detected by inspection before shipment.
  • the present invention aims to provide a technique for preventing an extremely small amount of leak in a spiral wound type membrane element.
  • the present invention is With a water collection pipe, A separation membrane wound around the water collecting pipe, A coating layer provided on the end surface of the separation membrane in a direction parallel to the longitudinal direction of the water collection pipe, There is provided a spiral wound type membrane element.
  • the present invention provides Wrapping the separation membrane around the collection tube, Forming a coating layer on the end face of the separation membrane in a direction parallel to the longitudinal direction of the liquid collection tube; including, Provided is a method for manufacturing a spiral wound type membrane element.
  • FIG. 1 is an exploded perspective view of a spiral wound type membrane element according to an embodiment of the present invention.
  • FIG. 2 is an enlarged sectional view of an end portion of the spiral wound type membrane element shown in FIG.
  • FIG. 3 is a perspective view of the separation membrane element showing an end surface of the separation membrane in the circumferential direction of the water collection pipe.
  • FIG. 4A is a diagram showing a manufacturing process of the spiral wound type membrane element.
  • FIG. 4B is a diagram showing a manufacturing process that follows FIG. 4A.
  • FIG. 4C is a diagram showing a manufacturing process that follows FIG. 4B.
  • FIG. 4D is a diagram showing a manufacturing process that follows FIG. 4C.
  • FIG. 1 shows a spiral wound type membrane element 10 (hereinafter, also referred to as “separation membrane element 10”) according to an embodiment of the present invention.
  • the separation membrane element 10 includes a water collecting pipe 21 and a laminated body 22.
  • the laminated body 22 is arranged around the water collection pipe 21.
  • a raw water channel and a permeate channel are formed inside the laminated body 22.
  • the water collection pipe 21 penetrates the center of the stacked body 22.
  • Raw water is supplied to the inside of the separation membrane element 10 from one end surface of the laminated body 22, and flows through the raw water flow path in parallel with the longitudinal direction of the water collection pipe 21.
  • the raw water is filtered to generate concentrated water and permeated water.
  • the permeated water is guided to the outside through the water collection pipe 21.
  • the concentrated water is discharged from the other end surface of the laminated body 22 to the outside of the separation membrane element 10.
  • the liquid to be treated (filtered) by the separation membrane element 10 includes water (raw water).
  • water is used herein as a representative of liquid.
  • the laminated body 22 is composed of a separation membrane 12, a raw water spacer 13, and a permeated water spacer 14.
  • the end surface of the separation film 12 constitutes the end surface of the stacked body 22.
  • the laminated body 22 is composed of a plurality of separation membranes 12, a plurality of raw water spacers 13 and a plurality of permeated water spacers 14.
  • the plurality of separation membranes 12 are overlapped with each other, sealed on three sides so as to have a bag-like structure, and wound around the water collection pipe 21.
  • a raw water spacer 13 is disposed between the separation membranes 12 so as to be located outside the bag-shaped structure. The raw water spacer 13 secures a space as a raw water flow path between the separation membranes 12.
  • a permeate spacer 14 is arranged between the separation membranes 12 so as to be located inside the bag-shaped structure. The permeated water spacer 14 secures a space as a permeated water flow path between the separation membranes 12.
  • a pair of separation membranes 12 and a pair of permeated water spacers 14 form a membrane leaf 11. The open end of the membrane leaf 11 is connected to the water collection pipe 21 so that the permeate flow path communicates with the water collection pipe 21.
  • the water collection pipe 21 plays a role of collecting permeated water that has permeated each separation membrane 12 and guiding it to the outside of the separation membrane element 10.
  • the water collection pipe 21 is provided with a plurality of through holes 21h at predetermined intervals along the longitudinal direction thereof. The permeated water flows into the water collection pipe 21 through these through holes 21h.
  • the separation membrane element 10 has, as the separation membrane 12, an MF membrane, a UF membrane, an NF membrane, or an RO membrane.
  • the MF membrane Microfiltration membrane
  • the UF membrane Ultrafiltration membrane
  • the RO membrane Reverse Osmosis membrane
  • the NF membrane is a kind of RO membrane and allows monovalent ions such as Na + and Cl ⁇ to pass through and blocks polyvalent ions such as SO 4 2 ⁇ .
  • the raw water spacer 13 and the permeated water spacer 14 are mesh members made of a resin material such as PPS and ethylene-chlorotrifluoroethylene copolymer (ECTFE).
  • ECTFE ethylene-chlorotrifluoroethylene copolymer
  • the separation membrane element 10 may include a shell that surrounds the laminated body 22.
  • the shell may be made of FRP (fiber reinforced plastic).
  • end face members may be arranged on both sides of the laminated body 22.
  • FIG. 2 shows an enlarged cross section of the end of the separation membrane element 10.
  • the separation membrane element 10 of the present embodiment further includes a coating layer 24.
  • the coating layer 24 is provided on the end surface 12p of the separation membrane 12 in the direction parallel to the longitudinal direction of the water collection pipe 21.
  • the coating layer 24 has a property of not allowing the raw water to permeate therethrough, and prevents the raw water from flowing into the permeated water channel.
  • the coating layer 24 can prevent an extremely small amount of leak in the separation membrane element 10.
  • the end surface of the separation membrane element 10 is composed of the end surface 12p of the separation membrane 12, the end surface 26p of the adhesive layer 26, and the outlet 13p of the raw water flow path.
  • the raw water flow path is secured by a raw water spacer 13 sandwiched between the membrane leaves 11 and the membrane leaf 11.
  • the adhesive layer 26 is a layer of an adhesive used to give the separation membrane 12 a bag-like structure. In detail, the adhesive layer 26 adheres the ends of the pair of separation membranes 12 to each other.
  • the coating layer 24 covers the end surface 12p of the separation membrane 12 and the end surface 26p of the adhesive layer 26. In other words, the coating layer 24 covers the end surface of the membrane leaf 11.
  • the end surface of the membrane leaf 11 is constituted by the end surface 12p of the separation membrane 12 and the end surface 26p of the adhesive layer 26.
  • the outlet 13p of the raw water channel is not covered with the coating layer 24 and is exposed to the outside.
  • the coating layer 24 has a spiral shape.
  • the separation membrane element 10 has a plurality of membrane leaves 11, there may be a plurality of coating layers 24 in the shape of a spiral.
  • the trace amount of leakage in the separation membrane element 10 is caused by the gap formed between the separation membrane 12 and the adhesive layer 26. Since the coating layer 24 is provided so as to straddle the separation membrane 12 and the adhesive layer 26, the gap that causes a leak can be reliably sealed by the coating layer 24. As a result, a very small amount of leak in the separation membrane element 10 can be prevented.
  • the coating layer 24 is made of, for example, a resin material having a composition different from that of the adhesive forming the adhesive layer 26.
  • the adhesive forming the adhesive layer 26 is, for example, a urethane resin adhesive.
  • the resin material forming the coating layer 24 is, for example, an epoxy resin.
  • the urethane resin adhesive is suitable as a material for the adhesive layer 26 because it has low fluidity and high retention.
  • Epoxy resin is suitable as a material for the coating layer 24 because it has high fluidity and high permeability.
  • the coating layer 24 may be made of a resin material (adhesive) having the same composition as that of the adhesive forming the adhesive layer 26. In this case, the effect of cost reduction is expected.
  • the thickness of the coating layer 24 is also not particularly limited.
  • the coating layer 24 has a thickness of, for example, 1 to 1000 ⁇ m.
  • the thickness of the coating layer 24 may be an average value of measurement values at arbitrary plural points (for example, 5 points) measured by a micrometer.
  • FIG. 3 shows the end face 12q of the separation membrane 12 in the circumferential direction of the water collection pipe 21.
  • the coating layer 24 is provided only on both end surfaces of the separation membrane element 10 in the direction parallel to the longitudinal direction of the water collection pipe 21.
  • the end face 12q of the separation membrane 12 in the circumferential direction of the water collection pipe 21 (the end face of the membrane leaf 11 in the circumferential direction of the water collection pipe 21) is exposed to the outside. Since the end face 12q of the separation membrane 12 in the circumferential direction of the water collection pipe 21 is usually covered with a shell, it is unlikely to be exposed to the flow of raw water and is unlikely to be a leak occurrence site.
  • the manufacturing process can be simplified.
  • a minute gap that causes a leak may be formed by trimming. ..
  • the coating layers 24 are provided on both end surfaces of the separation membrane element 10 in the direction parallel to the longitudinal direction of the water collection pipe 21, even if a minute gap that causes a leak occurs in the trimming process, It is possible to reliably seal such a minute gap by the coating layer 24.
  • the coating layer 24 may be provided on the end surface 12q of the separation membrane 12 in the circumferential direction of the water collection pipe 21. In this case, it is possible to prevent the end surface 12q of the separation membrane 12 in the circumferential direction of the water collection pipe 21 from becoming a leak generation site.
  • the separation membrane 12, the raw water spacer 13, and the permeated water spacer 14 are wound around the water collection pipe 21.
  • the raw water spacer 13 is arranged between the separation membranes 12 folded in two, and the permeate spacer 14 is arranged on the separation membrane 12.
  • the adhesive 26a is applied to the three sides of the perimeter of the permeate spacer 14. Thereby, the separation membrane unit U is obtained.
  • the adhesive 26a is in an uncured state at this point.
  • a plurality of (for example, four) separation membrane units U are wound around the water collection pipe 21.
  • the adhesive 26a is cured to form the adhesive layer 26 and the bag-shaped membrane leaf 11 is formed.
  • an assembly including the water collecting pipe 21 and the laminated body 22 is obtained.
  • only one separation membrane unit U may be wound around the water collecting pipe 21.
  • the end 12t of the separation membrane 12 in the direction parallel to the longitudinal direction of the water collection pipe 21 is trimmed.
  • the end portion of the laminated body 22 is trimmed.
  • the trimming step may be omitted.
  • a resin material 24a such as an epoxy resin is applied on the end surface 12p of the separation membrane 12 in a direction parallel to the longitudinal direction of the water collection pipe 21 to form a coating layer 24.
  • the coating layer 24 is formed so as to cover the entire end surface 12p of the separation film 12 and the end surface 26p of the adhesive layer 26.
  • the method for forming the coating layer 24 is not particularly limited.
  • the coating layer 24 can be formed by applying the resin material 24a on the end surface 12p of the separation film 12.
  • Examples of the method of applying the resin material 24a include a printing method, a dipping method, a spray method and the like. Since the outlet 13p of the raw water channel (see FIG. 2) is relatively wide, it is easy to prevent the outlet 13p of the raw water channel from being blocked by the resin material 24a, and many coating methods can be adopted. it can.
  • the coating layer 24 can be accurately and selectively formed on the end surface 12p of the separation film 12 and the end surface 26p of the adhesive layer 26.
  • the coating layer 24 is particularly effective when the separation membrane element 10 is an NF membrane element or an RO membrane element.
  • the NF membrane element and the RO membrane element are used, for example, in the production of ultrapure water. It is desirable that ultrapure water does not contain a very small amount of impurities, and for that purpose, it is desirable that there is no very small amount of leakage.
  • Reverse osmosis membranes such as NF membrane and RO membranes are often composite separation membranes having a laminated structure of a support layer and a skin layer.
  • the support layer may be a laminated film of a non-woven fabric and a UF layer.
  • the skin layer is a layer that exhibits a separating function, and is typically made of polyamide.
  • the adhesive 26 a when the adhesive 26 a is applied, the adhesive 26 a impregnates the nonwoven fabric of the separation membrane 12. If the non-woven fabric is not sufficiently impregnated with the adhesive 26 a, a gap that allows the leakage of fine particles may remain between the separation membrane 12 and the adhesive layer 26.
  • the coating layer 24 plays a role of sealing such a minute gap. Therefore, in the spiral wound type membrane element using the composite separation membrane, the benefit of the coating layer 24 can be maximized.
  • the technique of the present invention is useful for a spiral wound type membrane element.
  • the technique of the present invention is particularly useful for a spiral wound type membrane element using a composite separation membrane.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Cet élément de membrane en spirale 10 comprend un tuyau de collecte d'eau 21, une membrane de séparation 12 qui est enroulée sur le tuyau de collecte d'eau 21, et une couche de recouvrement 24 qui est disposée sur une surface d'extrémité 12p de la membrane de séparation 12 dans une direction parallèle à la direction longitudinale du tuyau de collecte d'eau. La couche de recouvrement 24 est, par exemple, configurée à partir d'un matériau de résine ayant une composition différente de celle d'un adhésif 26 qui est utilisé pour fixer une structure de forme de sac à la membrane de séparation 12.
PCT/JP2019/047509 2019-01-18 2019-12-04 Élément de membrane en spirale et son procédé de production WO2020149041A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019007264A JP7302973B2 (ja) 2019-01-18 2019-01-18 スパイラル型膜エレメント及びその製造方法
JP2019-007264 2019-04-03

Publications (1)

Publication Number Publication Date
WO2020149041A1 true WO2020149041A1 (fr) 2020-07-23

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PCT/JP2019/047509 WO2020149041A1 (fr) 2019-01-18 2019-12-04 Élément de membrane en spirale et son procédé de production

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WO (1) WO2020149041A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024203136A1 (fr) * 2023-03-24 2024-10-03 日東電工株式会社 Matériau d'étanchéité pour dispositifs de séparation à membrane, et dispositif de séparation à membrane

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005103516A (ja) * 2003-10-02 2005-04-21 Nitto Denko Corp スパイラル型膜エレメント及びその製造方法
JP2006068644A (ja) * 2004-09-02 2006-03-16 Nitto Denko Corp スパイラル型逆浸透膜エレメント、その製造方法およびその使用方法
WO2012133153A1 (fr) * 2011-03-29 2012-10-04 東レ株式会社 Élément de membrane de séparation en spirale et son procédé de fabrication
JP2014140837A (ja) * 2012-12-26 2014-08-07 Toray Ind Inc 分離膜エレメント
JP2015110220A (ja) * 2013-10-31 2015-06-18 東レ株式会社 スパイラル型分離膜エレメントおよびその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005103516A (ja) * 2003-10-02 2005-04-21 Nitto Denko Corp スパイラル型膜エレメント及びその製造方法
JP2006068644A (ja) * 2004-09-02 2006-03-16 Nitto Denko Corp スパイラル型逆浸透膜エレメント、その製造方法およびその使用方法
WO2012133153A1 (fr) * 2011-03-29 2012-10-04 東レ株式会社 Élément de membrane de séparation en spirale et son procédé de fabrication
JP2014140837A (ja) * 2012-12-26 2014-08-07 Toray Ind Inc 分離膜エレメント
JP2015110220A (ja) * 2013-10-31 2015-06-18 東レ株式会社 スパイラル型分離膜エレメントおよびその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024203136A1 (fr) * 2023-03-24 2024-10-03 日東電工株式会社 Matériau d'étanchéité pour dispositifs de séparation à membrane, et dispositif de séparation à membrane

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Publication number Publication date
JP2020116484A (ja) 2020-08-06
JP7302973B2 (ja) 2023-07-04

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