WO2020149041A1 - Spiral membrane element and method for producing same - Google Patents

Spiral membrane element and method for producing same 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
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Prior art keywords
separation membrane
membrane element
membrane
coating layer
separation
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PCT/JP2019/047509
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French (fr)
Japanese (ja)
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川島　敏行
松田　英樹
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日東電工株式会社
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Publication of WO2020149041A1 publication Critical patent/WO2020149041A1/en

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    • 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
    • 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
    • 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.

Abstract

This spiral membrane element 10 comprises a water collection pipe 21, a separation membrane 12 that is wound on the water collection pipe 21, and a cover layer 24 that is provided on an end surface 12p of the separation membrane 12 in a direction parallel to the longitudinal direction of the water collection pipe 21. The cover layer 24 is, for example, configured from a resin material having a composition different from that of an adhesive 26 that is used in order to attach a bag-form structure to the separation membrane 12.

Description

スパイラル型膜エレメント及びその製造方法Spiral type membrane element and method for producing the same
　本発明は、スパイラル型膜エレメント及びその製造方法に関する。 The present invention relates to a spiral wound type membrane element and a method for producing the same.
　スパイラル型膜エレメントは、海水の淡水化、純水の製造、廃水処理、油田注入水の製造などを目的としたシステムに使用されている。スパイラル型膜エレメントは、例えば、集水管と、集水管に巻きつけられた膜リーフとを備えている。 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.
　膜リーフは、スペーサ及び複数の分離膜によって構成されている。複数の分離膜は、袋状の形状を有するように外周部分が接着剤によって封止されている。 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.
特開２００９－０１８２３９号公報JP, 2009-018239, A
　接着剤による封止が不十分である場合、原水流路から透過水流路へと原水がリークし、阻止率が低下する。封止が不十分な製品は、出荷前の検査で発見することができる。ただし、出荷前の検査で発見できないほど極微量のリークが生じていることもある。 If 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.
　本発明は、スパイラル型膜エレメントにおける極微量のリークを防ぐための技術を提供することを目的とする。 The present invention aims to provide a technique for preventing an extremely small amount of leak in a spiral wound type membrane element.
　本発明は、
　集水管と、
　前記集水管に巻き付けられた分離膜と、
　前記集水管の長手方向と平行な方向における前記分離膜の端面上に設けられた被覆層と、
　を備えた、スパイラル型膜エレメントを提供する。 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.
　別の側面において、本発明は、
　分離膜を集液管に巻き付けることと、
　前記集液管の長手方向に平行な方向における前記分離膜の端面上に被覆層を形成することと、
　を含む、
　スパイラル型膜エレメントの製造方法を提供する。 In another aspect, 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.
　本発明によれば、スパイラル型膜エレメントにおける極微量のリークを防ぐことができる。 According to the present invention, it is possible to prevent an extremely small amount of leak in the spiral wound type membrane element.
図１は、本発明の一実施形態に係るスパイラル型膜エレメントの展開斜視図である。FIG. 1 is an exploded perspective view of a spiral wound type membrane element according to an embodiment of the present invention. 図２は、図１に示すスパイラル型膜エレメントの端部の拡大断面図である。FIG. 2 is an enlarged sectional view of an end portion of the spiral wound type membrane element shown in FIG. 図３は、集水管の周方向における分離膜の端面を示す分離膜エレメントの斜視図である。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. 図４Ａは、スパイラル型膜エレメントの製造工程を示す図である。FIG. 4A is a diagram showing a manufacturing process of the spiral wound type membrane element. 図４Ｂは、図４Ａに続く製造工程を示す図である。FIG. 4B is a diagram showing a manufacturing process that follows FIG. 4A. 図４Ｃは、図４Ｂに続く製造工程を示す図である。FIG. 4C is a diagram showing a manufacturing process that follows FIG. 4B. 図４Ｄは、図４Ｃに続く製造工程を示す図である。FIG. 4D is a diagram showing a manufacturing process that follows FIG. 4C.
　以下、本発明の実施形態について、図面を参照しながら説明する。本発明は、以下の実施形態に限定されない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments below.
　図１は、本発明の一実施形態に係るスパイラル型膜エレメント１０（以下、「分離膜エレメント１０」とも称する）を示している。分離膜エレメント１０は、集水管２１及び積層体２２を備えている。積層体２２は、集水管２１の周囲に配置されている。積層体２２の内部に原水流路と透過水流路とが形成されている。集水管２１は、積層体２２の中心を貫いている。 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.
　原水は、積層体２２の一方の端面から分離膜エレメント１０の内部に供給され、集水管２１の長手方向に平行に原水流路を流れる。分離膜エレメント１０において、原水がろ過されて濃縮水と透過水とが生成される。透過水は、集水管２１を通じて外部に導かれる。濃縮水は、積層体２２の他方の端面から分離膜エレメント１０の外部に排出される。 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. In the separation membrane element 10, 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.
　分離膜エレメント１０によって処理（ろ過）されるべき液体としては、水（原水）が挙げられる。本明細書では、簡単のため、液体の代表として「水」の用語を使用する。 The liquid to be treated (filtered) by the separation membrane element 10 includes water (raw water). For simplicity, the term "water" is used herein as a representative of liquid.
　積層体２２は、分離膜１２、原水スペーサ１３及び透過水スペーサ１４によって構成されている。分離膜１２の端面が積層体２２の端面を構成する。積層体２２は、詳細には、複数の分離膜１２、複数の原水スペーサ１３及び複数の透過水スペーサ１４によって構成されている。 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. Specifically, 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.
　複数の分離膜１２は、互いに重ね合わされ、袋状の構造を有するように３辺において封止され、集水管２１に巻きつけられている。袋状の構造の外部に位置するように、分離膜１２と分離膜１２との間に原水スペーサ１３が配置されている。原水スペーサ１３は、分離膜１２と分離膜１２との間に原水流路としての空間を確保している。袋状の構造の内部に位置するように、分離膜１２と分離膜１２との間に透過水スペーサ１４が配置されている。透過水スペーサ１４は、分離膜１２と分離膜１２との間に透過水流路としての空間を確保している。１対の分離膜１２及び透過水スペーサ１４によって膜リーフ１１が構成されている。透過水流路が集水管２１に連通するように、膜リーフ１１の開口端が集水管２１に接続されている。 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.
　集水管２１は、各分離膜１２を透過した透過水を集めて分離膜エレメント１０の外部に導く役割を担っている。集水管２１には、その長手方向に沿って複数の貫通孔２１ｈが所定間隔で設けられている。透過水は、これらの貫通孔２１ｈを通じて集水管２１の中に流入する。 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.
　分離膜エレメント１０は、分離膜１２として、ＭＦ膜、ＵＦ膜、ＮＦ膜又はＲＯ膜を有する。ＭＦ膜（Microfiltration membrane）は、０．０５～１０μｍ程度の大きさの微粒子及び微生物を液体から分離することを目的とした膜である。ＵＦ膜（Ultrafiltration membrane）は、ＭＦ膜によって除去することができない大きさの微粒子、及び、１０００～３０００００程度の分子量を有する溶質を液体から分離することを目的とした膜である。ＲＯ膜（Reverse Osmosis membrane）は、逆浸透現象によって水を透過水流路に移行させることによって水と溶質とを分離することを目的とした膜である。ＮＦ膜（Nanofiltration membrane）は、ＲＯ膜の一種であって、Ｎａ+及びＣｌ-のような１価イオンを通し、ＳＯ4 2-のような多価イオンを阻止する。 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) is a membrane intended to separate fine particles and microorganisms having a size of about 0.05 to 10 μm from a liquid. The UF membrane (Ultrafiltration membrane) is a membrane intended to separate fine particles having a size that cannot be removed by the MF membrane and solutes having a molecular weight of about 1000 to 300,000 from a liquid. The RO membrane (Reverse Osmosis membrane) is a membrane intended to separate water and solute by transferring water to a permeate flow channel by a reverse osmosis phenomenon. The NF membrane (Nanofiltration 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− .
　原水スペーサ１３及び透過水スペーサ１４は、ＰＰＳ、エチレン－クロロトリフルオロエチレン共重合体（ＥＣＴＦＥ）などの樹脂材料で作られた網状の部材である。 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).
　分離膜エレメント１０は、積層体２２を包囲するシェルを備えていてもよい。シェルは、ＦＲＰ（fiber reinforced plastic）によって作られていてもよい。積層体２２の端面を保護するとともに、積層体２２がテレスコピック状に伸張することを防止するために、積層体２２の両側に端面部材が配置されていてもよい。 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). In order to protect the end surface of the laminated body 22 and prevent the laminated body 22 from expanding telescopically, end face members may be arranged on both sides of the laminated body 22.
　図２は、分離膜エレメント１０の端部の断面を拡大して示している。本実施形態の分離膜エレメント１０は、被覆層２４をさらに備えている。被覆層２４は、集水管２１の長手方向と平行な方向における分離膜１２の端面１２ｐの上に設けられている。被覆層２４は、原水が透過できない性質を持っており、透過水流路への原水の流入を阻止する。被覆層２４によって、分離膜エレメント１０における極微量のリークを防ぐことができる。 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.
　図２に示すように、分離膜エレメント１０の端面は、分離膜１２の端面１２ｐ、接着剤層２６の端面２６ｐ、及び、原水流路の出口１３ｐによって構成されている。原水流路は、膜リーフ１１と膜リーフ１１との間に挟まれた原水スペーサ１３によって確保されている。接着剤層２６は、分離膜１２に袋状の構造を付与するために使用された接着剤の層である。接着剤層２６は、詳細には、１対の分離膜１２の端部同士を接着している。被覆層２４は、分離膜１２の端面１２ｐ及び接着剤層２６の端面２６ｐを被覆している。言い換えれば、被覆層２４は、膜リーフ１１の端面を被覆している。膜リーフ１１の端面は、分離膜１２の端面１２ｐ及び接着剤層２６の端面２６ｐによって構成されている。原水流路の出口１３ｐは、被覆層２４によって被覆されておらず、外部に露出している。分離膜１２の端面を平面視すると、被覆層２４は、螺旋の形状を呈する。分離膜エレメント１０が複数の膜リーフ１１を有するとき、螺旋の形状の複数の被覆層２４が存在しうる。 As shown in FIG. 2, 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. When the end surface of the separation membrane 12 is viewed in a plan view, the coating layer 24 has a spiral shape. When 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.
　分離膜エレメント１０における極微量のリークは、分離膜１２と接着剤層２６との間に形成された隙間が原因で起こると考えられる。被覆層２４は、分離膜１２と接着剤層２６とにまたがって設けられているので、リークの原因となる隙間を被覆層２４によって確実に封じることができる。その結果、分離膜エレメント１０における極微量のリークを防ぐことができる。 It is considered that 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.
　被覆層２４は、例えば、接着剤層２６を構成する接着剤の組成と異なる組成の樹脂材料で構成されている。接着剤層２６を構成する接着剤は、例えば、ウレタン樹脂接着剤である。被覆層２４を構成する樹脂材料は、例えば、エポキシ樹脂である。ウレタン樹脂接着剤は、流動性が低く保持性が高いので、接着剤層２６の材料として適している。エポキシ樹脂は、流動性が高く浸透性が高いので、被覆層２４の材料として適している。分離膜１２と接着剤層２６との間の微小な隙間に被覆層２４の材料が染み込むことによって、微小な隙間によって引き起こされる微量のリークを防止することができる。本実施形態によれば、各部分に適した材料を選択して採用することができる。 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. When the material of the coating layer 24 penetrates into the minute gap between the separation film 12 and the adhesive layer 26, a minute amount of leak caused by the minute gap can be prevented. According to this embodiment, a material suitable for each part can be selected and adopted.
　あるいは、被覆層２４は、接着剤層２６を構成する接着剤の組成と同一の組成の樹脂材料（接着剤）によって構成されていてもよい。この場合、コスト低減の効果が見込まれる。 Alternatively, 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.
　被覆層２４の厚さも特に限定されない。被覆層２４の厚さは、例えば、１～１０００μｍである。被覆層２４の厚さは、マイクロメータによる任意の複数点（例えば５点）での測定値の平均値でありうる。 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 μm. 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.
　図３は、集水管２１の周方向における分離膜１２の端面１２ｑを示している。本実施形態において、被覆層２４は、集水管２１の長手方向と平行な方向における分離膜エレメント１０の両端面のそれぞれにのみ設けられている。集水管２１の周方向における分離膜１２の端面１２ｑ（集水管２１の周方向における膜リーフ１１の端面）は外部に露出している。集水管２１の周方向における分離膜１２の端面１２ｑは、通常、シェルによって被覆されているので、原水の流れに晒される可能性は低く、リークの発生箇所となる可能性も低い。一方、集水管２１の周方向における分離膜１２の端面１２ｑから被覆層２４を省略することによって、製造工程を簡素化できる。 FIG. 3 shows the end face 12q of the separation membrane 12 in the circumferential direction of the water collection pipe 21. In the present embodiment, 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. On the other hand, by omitting the coating layer 24 from the end surface 12q of the separation membrane 12 in the circumferential direction of the water collection pipe 21, the manufacturing process can be simplified.
　後述するように、集水管２１の長手方向と平行な方向における分離膜エレメント１０の両端部にトリミングが施されている場合、リークの原因となる微小な隙間がトリミングによって形成される可能性もある。集水管２１の長手方向と平行な方向における分離膜エレメント１０の両端面のそれぞれに被覆層２４が設けられていると、リークの原因となる微小な隙間がトリミング工程で発生したとしても、そのような微小な隙間を被覆層２４によって確実に封じることができる。 As will be described later, when both ends of the separation membrane element 10 in a direction parallel to the longitudinal direction of the water collection pipe 21 are trimmed, a minute gap that causes a leak may be formed by trimming. .. When 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.
　もちろん、集水管２１の周方向における分離膜１２の端面１２ｑの上にも被覆層２４が設けられていてもよい。この場合、集水管２１の周方向における分離膜１２の端面１２ｑがリークの発生箇所となることも防止できる。 Of course, 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.
　次に、図４Ａ～図４Ｄを参照して分離膜エレメント１０の製造方法を説明する。 Next, a method for manufacturing the separation membrane element 10 will be described with reference to FIGS. 4A to 4D.
　まず、図４Ａ及び図４Ｂに示すように、分離膜１２、原水スペーサ１３及び透過水スペーサ１４を集水管２１に巻き付ける。詳細には、図４Ａに示すように、２つに折り畳まれた分離膜１２の間に原水スペーサ１３を配置し、分離膜１２の上に透過水スペーサ１４を配置する。さらに、透過水スペーサ１４の外周部の３辺に接着剤２６ａを塗布する。これにより、分離膜ユニットＵが得られる。接着剤２６ａは、この時点では、未硬化の状態である。図４Ｂに示すように、複数（例えば４つ）の分離膜ユニットＵを集水管２１に巻き付ける。集水管２１に分離膜ユニットＵが巻き付けられたのち、接着剤２６ａが硬化して接着剤層２６が形成されるとともに、袋状の膜リーフ１１が形成される。これにより、集水管２１及び積層体２２を含む組立体が得られる。なお、分離膜ユニットＵを１つのみ集水管２１に巻き付けることもある。 First, as shown in FIGS. 4A and 4B, the separation membrane 12, the raw water spacer 13, and the permeated water spacer 14 are wound around the water collection pipe 21. Specifically, as shown in FIG. 4A, 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. Further, 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. As shown in FIG. 4B, a plurality of (for example, four) separation membrane units U are wound around the water collection pipe 21. After the separation membrane unit U is wound around the water collecting pipe 21, the adhesive 26a is cured to form the adhesive layer 26 and the bag-shaped membrane leaf 11 is formed. As a result, an assembly including the water collecting pipe 21 and the laminated body 22 is obtained. In addition, only one separation membrane unit U may be wound around the water collecting pipe 21.
　分離膜１２を集水管２１に巻き付けたのち、図４Ｃに示すように、集水管２１の長手方向に平行な方向における分離膜１２の端部１２ｔをトリミングする。言い換えれば、積層体２２の端部をトリミングする。これにより、集水管２１及び積層体２２を含む組立体の端面を平滑に仕上げることができる。トリミングの工程は省略されることもある。 After wrapping the separation membrane 12 around the water collection pipe 21, as shown in FIG. 4C, the end 12t of the separation membrane 12 in the direction parallel to the longitudinal direction of the water collection pipe 21 is trimmed. In other words, the end portion of the laminated body 22 is trimmed. Thereby, the end surface of the assembly including the water collecting pipe 21 and the laminated body 22 can be finished smooth. The trimming step may be omitted.
　その後、図４Ｄに示すように、集水管２１の長手方向に平行な方向における分離膜１２の端面１２ｐの上にエポキシ樹脂などの樹脂材料２４ａを塗布して被覆層２４を形成する。詳細には、分離膜１２の端面１２ｐ及び接着剤層２６の端面２６ｐの全体を被覆するように被覆層２４を形成する。これにより、本実施形態のスパイラル型膜エレメント１０が得られる。 Thereafter, as shown in FIG. 4D, 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. Specifically, 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. As a result, the spiral wound type membrane element 10 of the present embodiment is obtained.
　被覆層２４を形成する方法は特に限定されない。例えば、分離膜１２の端面１２ｐの上に樹脂材料２４ａを塗布することによって被覆層２４を形成することができる。樹脂材料２４ａを塗布する方法としては、印刷法、ディッピング法、スプレー法などが挙げられる。原水流路の出口１３ｐ（図２参照）の幅は比較的広いので、原水流路の出口１３ｐが樹脂材料２４ａによって塞がらないようにすることは容易であり、多くの塗布方法を採用することができる。 The method for forming the coating layer 24 is not particularly limited. For example, 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.
　例えば、スクリーン２８を用いたスクリーン印刷法によれば、分離膜１２の端面１２ｐ及び接着剤層２６の端面２６ｐの上に正確かつ選択的に被覆層２４を形成できる。 For example, according to the screen printing method using the screen 28, 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.
　被覆層２４は、分離膜エレメント１０がＮＦ膜エレメント又はＲＯ膜エレメントであるときに特に効果を発揮する。ＮＦ膜エレメント及びＲＯ膜エレメントは、例えば、超純水の製造に使用される。超純水には極微量の不純物も含まれていないことが望ましく、そのためには、極微量のリークも無いことが望ましい。 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.
　ＮＦ膜及びＲＯ膜など逆浸透膜の構造も極微量のリークに関与している。ＮＦ膜及びＲＯ膜など逆浸透膜は、支持層とスキン層との積層構造を有する複合分離膜であることが多い。支持層は、不織布とＵＦ層との積層膜でありうる。スキン層は、分離機能を発揮する層であり、典型的には、ポリアミドによって構成されている。 ▽The structure of reverse osmosis membrane such as NF membrane and RO membrane also contributes to the extremely small amount of leak. Reverse osmosis membranes such as NF membranes 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.
　図４Ａを参照して説明したように、接着剤２６ａを塗布したとき、接着剤２６ａは、分離膜１２の不織布に含浸する。不織布への接着剤２６ａの含浸が不十分である場合、微粒子のリークを許容する隙間が分離膜１２と接着剤層２６との間に残る可能性がある。被覆層２４は、そのような微小な隙間を封じる役割を果たす。したがって、複合分離膜を用いたスパイラル型膜エレメントにおいて、被覆層２４による利益を最大限に得られる。 As described with reference to FIG. 4A, 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.
　本発明の技術は、スパイラル型膜エレメントに有用である。本発明の技術は、特に、複合分離膜を用いたスパイラル型膜エレメントに有用である。 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.

Claims (7)

  1. 　集液管と、
    　前記集液管に巻き付けられた分離膜と、
    　前記集液管の長手方向と平行な方向における前記分離膜の端面上に設けられた被覆層と、
    　を備えた、スパイラル型膜エレメント。     A collection tube,
    A separation membrane wound around the collection tube,
    A coating layer provided on the end face of the separation membrane in a direction parallel to the longitudinal direction of the liquid collection tube,
    Spiral type membrane element equipped with.
  2. 　前記被覆層は、前記分離膜に袋状の構造を付与するために使用された接着剤の組成と異なる組成の樹脂材料で構成されている、請求項１に記載のスパイラル型膜エレメント。 The spiral wound type membrane element according to claim 1, wherein the coating layer is made of a resin material having a composition different from the composition of the adhesive used to give the separation membrane a bag-like structure.
  3. 　前記接着剤がウレタン樹脂接着剤であり、
    　前記被覆層を構成する前記樹脂材料がエポキシ樹脂である、請求項２に記載のスパイラル型膜エレメント。     The adhesive is a urethane resin adhesive,
    The spiral wound type membrane element according to claim 2, wherein the resin material forming the coating layer is an epoxy resin.
  4. 　前記集液管の周方向における前記分離膜の端面は外部に露出している、請求項１から３のいずれか１項に記載のスパイラル型膜エレメント。 The spiral membrane element according to any one of claims 1 to 3, wherein an end surface of the separation membrane in the circumferential direction of the liquid collection tube is exposed to the outside.
  5. 　分離膜を集液管に巻き付けることと、
    　前記集液管の長手方向に平行な方向における前記分離膜の端面上に被覆層を形成することと、
    　を含む、
    　スパイラル型膜エレメントの製造方法。     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,
    Manufacturing method of spiral wound type membrane element.
  6. 　前記分離膜を前記集液管に巻き付けたのち、前記集液管の長手方向に平行な方向における前記分離膜の端部をトリミングすることをさらに含む、請求項５に記載のスパイラル型膜エレメントの製造方法。 The spiral wound type membrane element according to claim 5, further comprising: after winding the separation membrane around the collection tube, trimming an end portion of the separation membrane in a direction parallel to a longitudinal direction of the collection tube. Production method.
  7. 　前記分離膜の端面上に樹脂材料を塗布することによって前記被覆層を形成する、請求項５又は６に記載のスパイラル型膜エレメントの製造方法。 The method for producing a spiral wound type membrane element according to claim 5 or 6, wherein the coating layer is formed by applying a resin material on the end surface of the separation membrane.
PCT/JP2019/047509 2019-01-18 2019-12-04 Spiral membrane element and method for producing same WO2020149041A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005103516A (en) * 2003-10-02 2005-04-21 Nitto Denko Corp Spiral type membrane element and its production method
JP2006068644A (en) * 2004-09-02 2006-03-16 Nitto Denko Corp Spiral type reverse osmosis membrane element, production method therefor and using method therefor
WO2012133153A1 (en) * 2011-03-29 2012-10-04 東レ株式会社 Spiral separation membrane element and method for producing same
JP2014140837A (en) * 2012-12-26 2014-08-07 Toray Ind Inc Separation membrane element
JP2015110220A (en) * 2013-10-31 2015-06-18 東レ株式会社 Spiral-type separation membrane element and production method of the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005103516A (en) * 2003-10-02 2005-04-21 Nitto Denko Corp Spiral type membrane element and its production method
JP2006068644A (en) * 2004-09-02 2006-03-16 Nitto Denko Corp Spiral type reverse osmosis membrane element, production method therefor and using method therefor
WO2012133153A1 (en) * 2011-03-29 2012-10-04 東レ株式会社 Spiral separation membrane element and method for producing same
JP2014140837A (en) * 2012-12-26 2014-08-07 Toray Ind Inc Separation membrane element
JP2015110220A (en) * 2013-10-31 2015-06-18 東レ株式会社 Spiral-type separation membrane element and production method of the same

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