Nitto-denko Corporation

Kyoto Institute of Technology

Yasuhiro Uda

Shinichi Chikura

Masashi Beppu

Toshimitsu Hamada

Hideki Matsuda

Kentarou Kobayashi

Hiroki Fujioka

Katsumi Ishii

Mieko Nishi

Yuha Okazaki

Yuuji Nishida

Kazuhito Yoshida

Masakatsu Takata

Toshiyuki Kawashima

Takahisa Konishi

Nobuharu Tahara

Kouji Maruyama

Naoki Kurata

Chiaki Harada

Shinya Nishiyama

Satoru Ishihara

Makoto Kobuke

Yuuji Yamashiro

Hideyuki Yamane

Mitsuaki Hirokawa

Kentaro Yamamoto

A flow path spacer () of the present disclosure includes a plurality of first linear portions () and a plurality of second linear portions (). There are a first pair (P), a second pair (P), and a third pair (P), the first pair (P) is at least one selected from a pair of the first linear portions () adjacent to each other and disposed at a first interval (W) and a pair of the second linear portions () adjacent to each other and disposed at a first interval (W), the second pair (P) is at least one selected from a pair of the first linear portions () adjacent to each other and disposed at a second interval (W) narrower than the first interval (W) and a pair of the second linear portions () adjacent to each other and disposed at a second interval (W) narrower than the first interval (W), and the third pair (P) is at least one selected from a pair of the first linear portions () adjacent to each other and disposed at a third interval (W) narrower than the second interval (W) and a pair of the second linear portions () adjacent to each other and disposed at a third interval (W) narrower than the second interval (W).

Flow path spacer and spiral membrane element

A raw water channel spacer capable of suppressing formation of a concentration polarization layer in a region in the vicinity of a separation membrane in a raw water channel, and a spiral wound membrane element including the same are provided. A raw water channel spacer is formed by superposing a first yarn row and a second yarn row, and includes alternately a first mesh structure having a configuration in which first rectangular meshes formed of the yarn rows are continuous in an extending direction of the second yarn row, and a second mesh structure having a configuration in which meshes are continuous in the extending direction of the second yarn row such that an interval in the second yarn row is smaller than an interval of the second yarn row forming the first mesh structure.

Raw water channel spacer and spiral wound membrane element including the same

Provided is a spiral membrane element that has a restricted outer diameter and is capable of being decreased in operation energy therefor. The element is a spiral membrane element including plural membrane leaves in each of which a permeation-side flow-channel member is interposed between opposed separation membranes a supply-side flow-channel member interposed between any two of the membrane leaves a perforated central pipe on which the membrane leaves and the supply-side flow-channel member are wound and a sealing part that prevents a supply-side flow-channel member from being mixed with a permeation-side flow-channel member. This element has an efficiency index E of 0.005 to 0.10, and the thickness of the supply-side flow-channel member is from 10 to 110 mil.

Spiral membrane element

A spiral membrane element is provided which has a restricted outer diameter but is heightened in effective membrane area, and further which can be decreased in operation energy therefor. The spiral membrane element is an element including plural membrane leaves L in each of which a permeation-side flow-channel memberis interposed between opposed separation membranes; a supply-side flow-channel memberinterposed between any two of the membrane leaves L; a perforated central pipeon which the membrane leaves L and the supply-side flow-channel memberare wound; and sealing parts that prevent a supply-side flow-channel from being mixed with a permeation-side flow-channel. The sealing parts include both-end sealing partsin which an adhesive is used to seal two-side end parts of each of the membrane leaves L on both sides of the leaf in an axial direction Aof the leaf. The thickness Tof the both-end sealing partsis 390 to 540 &#x3bc;m.

Provided is a membrane module which has a simple and easy structure to restrain its vessel from being increased in costs, and which allows to fabricate the vessel by a simple and easy work, and further to locate an inlet for a fluid, and others at respective predetermined positions of the membrane module.

Membrane module

Provided is a spiral membrane module which is suitable for being set up in the vertical direction since at one end of its pressure vessel, the supply of feed liquid and the discharge of concentrated liquid can be attained.

Spiral membrane module

Provided are an inexpensive, high-quality, permeation-side flow path material that is suitable for use in spiral membrane elements and enables the improvement of productivity, a method for producing such a permeation-side flow path material, and a membrane element having such a permeation-side flow path material. Provided are (a) a permeation-side flow path material for use in a spiral membrane element, the permeation-side flow path material comprising a resin sheet comprising a plurality of ridge portionsformed parallel to one another; and a plurality of openingsformed between each pair of the ridge portions, (b) a method for producing such a permeation-side flow path material, and (c) a membrane element having such a permeation-side flow path material.

Permeation side flow path material for spiral membrane element and method for manufacturing same

The purpose of the present invention is to provide a highly reliable membrane module for removing hazardous components without the risk of a feed-source fluid and a concentrated fluid intermixing inside a hollow tube. The spiral wound separation membrane module is characterized in that: a spiral wound separation membrane element accommodated in a cylindrical container, the spiral wound separation membrane element having a structure in which a laminated body having a separation membrane, a feed-side spacer and a permeation-side spacer is wound around a porous hollow tube in a spiral shape, the feed-side spacer is positioned on a feed side of the separation membrane, the permeation-side spacer is positioned on a permeation side of the separation membrane, and a feed-side flow path and a permeation-side flow path are sealed so as not to communicate directly with each other.

Spiral wound separation membrane module

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-wound forward osmosis membrane element () includes: a membrane leaf () in which an internal flow path extending from a first opening (A) to a second opening (B) is formed; and a central tube () around which the membrane leaf () is wound and which has a feed hole (A) communicating with the first opening (A) and a collection hole (B) communicating with the second opening (B). The central tube () has an interior partitioned to include an inflow region (A) communicating with the feed hole (A) and an outflow region (B) communicating with the collection hole (B) so that the inflow region (A) and the outflow region (B) each form a flow path extending continuously in an axial direction of the central tube () from one end to the other end of the central tube (). Since a liquid fed into the inflow region (A) is discharged to the outside without passing through two or more internal flow paths (), the pressure loss in the spiral-wound forward osmosis membrane element () is reduced. Thereby, it is possible to provide a spiral-wound forward osmosis membrane element in which the pressure loss of the flow of a fluid is reduced.

Spiral-wound forward osmosis membrane element and forward osmosis 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

It is an object of the present invention to provide a composite semipermeable membrane having an excellent resistance property to contamination, particularly an excellent resistance property to microbial contamination, and a water treatment method using the composite semipermeable membrane. The present invention relates to a composite semipermeable membrane comprising a skin layer formed on the surface of a porous support and containing a polyamide-based resin obtained by reacting a polyfunctional amine component with a polyfunctional acid halide component, wherein an antibacterial layer containing a silver-based antibacterial agent and a polymer component is formed on the skin layer directly or with other layer interposed therebetween, and the weight ratio between the silver-based antibacterial agent and the polymer component in the antibacterial layer is 55:45 to 95:5 (silver-based antibacterial agent:polymer component).

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Ibaraki, Japan

Yasuhiro Uda