Nitto-denko Corporation

Kyoto Institute of Technology

Shinichi Chikura

Yasuhiro Uda

Masashi Beppu

Toshimitsu Hamada

Hideki Matsuda

Hiroki Fujioka

Katsumi Ishii

Yuuji Nishida

Kazuhito Yoshida

Masakatsu Takata

Takashi Akiyama

Nobuharu Tahara

Satoru Ishihara

Hideyuki Yamane

Mitsuaki Hirokawa

Kentaro Yamamoto

A membrane element includes a central pipe having, in its outer periphery, holes; a membrane wound body in which a membrane member is wound on the central pipe; end members arranged, respectively, at both ends of the membrane wound body; and an exterior member fitted to at least an outer periphery of the membrane wound body. In this element, the exterior member includes a fiber reinforced resin having a reinforcing fiber wound on the outer periphery of the membrane wound body; the end members each includes flexible portions extended from a main body toward the membrane wound body; and the reinforcing fiber is wound also onto an outer periphery of the flexible portions in a state that the flexible portions are deformed toward an outer peripheral surface of the membrane wound body.

Membrane element and membrane element end member used in same

An end member (A) for a spiral separation membrane element includes: an inner annular portion (); an outer annular portion () surrounding the inner annular portion () at a distance from the inner annular portion (); a plurality of connecting portions () connecting the inner annular portion () and the outer annular portion (); and a shield plate () disposed between at least one pair of the connecting portions () and forming an opening () between the shield plate () and the outer annular portion (). According to this configuration, a radially outwardly spreading flow is formed by the shield plate (), and therefore suspended solids in a feed liquid can be effectively directed to the peripheral region.

End member for spiral separation membrane element, spiral separation membrane element and separation membrane module

A spiral membrane element that can reduce the dimension increase in the length direction is provided. Also, a method for producing a spiral membrane element is provided having a step of forming a fiber reinforced resin layer having a reinforcing fiber layer and a strengthening fiber layer. The spiral membrane element is provided with a cylindrical wound body in which a separation membrane, a feed-side channel material, and a permeate-side channel material in a laminated state are wound in a spiral form around a center tube having a hole, and a sealing part for preventing feed-side fluid and permeate-side fluid from being mixed with each other, wherein a fiber reinforced resin layer having a reinforcing fiber layer and a strengthening fiber layer enclosed and buried with the same resin is provided on an outer circumferential side of the cylindrical wound body.

Spiral membrane element and method of producing the same

A spiral separation membrane element (A) includes: a wound body () including a separation membrane; a core tube () that penetrates the wound body () along the central axis of the wound body (); and a joining portion () that joins the wound body () to the core tube () at at least one end face () of the wound body (). The joining portion () has a holding portion () disposed inwardly of the end face () of the wound body () and an extending portion () formed integrally with the holding portion (). The spiral separation membrane element (A) further includes a restraining member (A) that secures the extending portion () to the core tube ().

Spiral separation membrane element

A separation membrane module (A) includes: a tubular pressure container (); a plurality of separation membrane elements () inserted in the pressure container () and each having a first end member () and a second end member (); and a sealing member (A) mounted on one of or both the first end member () and the second end member () that are adjacent to each other. In a normal condition, the sealing member (A) is located radially inward of a maximum diameter portion of the first end member () and/or the second end member () on which the sealing member (A) is mounted. The sealing member (A) is deformed due to contact between the adjacent separation membrane elements () or due to supply of a pressurized liquid into the pressure container (), and comes into close contact with an inner circumferential face () of the pressure container ().

Separation membrane module

Provided are a connection member capable of preventing leakage from a supply side to a permeating side from occurring by a simple means; and a separation membrane module using the connection member. The connection member () is used to connect in series a plurality of separation membrane elements equipped with end surface holding members () and to install the separation membrane elements in a pressure-resistant vessel (). The connection member () is characterized in that, when the separation membrane elements are connected to each other, the connection member is engaged with respective grooves () of the end surface holding members () adjacent to each other.

Connection member and separation membrane module using the same

An object of the invention is to provide a spiral separation membrane element that can reduce the pressure loss of a feed-side channel and be much less vulnerable to the problem of inhibition or blockage of the flow in the feed-side channel. The spiral separation membrane element includes one or more separation membranes, one or more feed-side channel components, one or more permeation-side channel components, and a perforated hollow core tube around which the separation membranes, the feed-side channel components and the permeation-side channel components are wrapped, wherein the feed-side channel component is a net formed by fusion bonding.

Spiral type separation membrane element

A spiral-type separation membrane element is provided that can reduce the pressure loss without changing the outer diameter and the inner diameter of the water-collecting tube. In a spiral-type separation membrane element in which a separation membrane, a feed-side flow passageway member, and a permeate-side flow passageway member are wound in a spiral form around a porous water-collecting tube in a laminated state, the feed-side flow passageway member includes a net-constituting thread in a direction tilted relative to a feed solution flow direction; the net-constituting thread has a cross-sectional part such that a thread diameter X in a direction parallel to a feed solution flow plane is larger than a thread diameter Y in a direction perpendicular to the feed solution flow plane; and a central part between intersection parts of the net-constituting thread is made to have a thread diameter Y smaller than that of an intersection part.

A spiral membrane module where membrane elements are easily connected to each other and the connection thereof is prevented from being loosened. The spiral membrane elements () are each formed in multiple layers by winding membranes and channel materials around a center tube () having holes and are received in a pressure vessel () such that they are connected in series with connection mechanisms (J) placed between the membrane elements (). Each connection mechanism (J) has a movable member (M) installed at either the upstream side end part or the downstream side end part of each membrane element () and having an engagement part () engageable with the other of the upstream side end or the downstream side end. The movable member (M) has a contact part () coming into contact with the inner wall () of the pressure vessel () and locking the engagement by the engagement part ().

Spiral membrane module

An object of the present invention is to provide a spiral membrane element that can form a uniform fiber reinforcement layer on an outer circumferential surface by a simple process without a great change in the materials, as well as a process for producing the same. The spiral membrane element of the present invention is a spiral membrane element which is provided with a cylindrical roll R in which a separation membrane, a feed-side flow passageway member, and a permeate-side flow passageway memberare spirally wound in a laminate state around a perforated center tubeand in which a sealing part for preventing mixing of feed-side fluid and permeate-side fluid is disposed, wherein at least one sheet of the permeate-side flow passageway memberhas a fiber clothextended or connected to the outer circumferential side, and the fiber clothis wound around an outer circumference of said cylindrical roll R, impregnated with a resin and hardened to thereby form a fiber reinforcement layer.

Spiral membrane element and process for producing the same

A seal ring holder for membrane elements which is capable of attaining an increase in the area of membranes packed per element; and a membrane element using the seal ring holder, are provided. The seal ring holder for membrane elements which is disposed at an end part of a spiral wound membrane element to hold a ring seal ring on the outer periphery thereof while allowing a raw liquid to flow into a membrane end part of the membrane element, includes: a first ring part which has a side wall facing an upstream-side membrane end part of the membrane element and is inserted into an end part of a sheathing member of the membrane element; a projecting ring part which has been formed upstream from the first ring part and has side walls respectively on both sides, an edge face of the sheathing member and the downstream-side edge face of the seal ring being fixable respectively to the side walls; a second ring part which is formed upstream from the projecting ring part and to the outer periphery of which the seal ring is to be fitted; and a third ring part which is formed upstream from the second ring part and to which the upstream-side end face of the seal ring is fixable.

Seal ring holder for membrane element and membrane element

A membrane element sealing material holding member comprising a central opening for insertion of a center tube of spiral membrane element, peripheral orifice for flowing of a raw liquid into a membrane end portion of membrane element and outer circumferential part for holding of circular sealing material, wherein the central opening has inner circumferential surface of cylindrical form with a diameter larger than the outer diameter of the inserted center tube, and wherein at three or more positions on the inner circumferential surface, there is provided projection that has sloping face on its side of center tube insertion and is deformable at the time of insertion of center tube with an outer diameter larger than that of incircle.

Membrane element sealing material holding member and membrane element

A sealer holding member for a membrane element is disposed at an end of a spiral-type membrane element on an outer circumference thereof, and allows a feed to flow into a membrane end of the membrane element. The sealer holding member includes a first annular portion, an annular projection, a second annular portion, and a third annular portion arranged in this order. The first annular portion is engaged with an outer-covering member for the membrane element and receives an end of the membrane element without contacting a side of the membrane element. The second annular portion receives a sealer on an outside thereof.

Growing community of inventors

Ibaraki, Japan

Shinichi Chikura