Toray Industries, Inc.

Hiroho Hirozawa

Masahiro Kimura

Yoshiki Okamoto

Hiroyuki Yamada

Kentaro Takagi

Takao Sasaki

Masakazu Koiwa

Kentarou Takagi

Shuji Furuno

Shunsuke Tabayashi

Yutaro Suzuki

Yoshie Marutani

Tsuyoshi Hamada

Hiroshi Umetani

Kiyoshi Minoura

Tamotsu Kitade

Yoshiyuki Kitamura

Hiroki Minehara

Yuji Tanaka

Hiroaki Tanaka

Katsufumi Oto

Akira Katayama

Masashi Ito

Satoko Morioka

Kenji Hayashida

Takeshi Konda

Akshay Garg

Yasuo Seike

Masanori Endo

Hiroshi Ogawa

Keita Wada

Fuka Ono

Takuji Nishioka

Monami Suzuki

Rina Iizuka

Yoko Hasegawa

Takagi Kentaro

According to the present invention, it is possible to obtain a separation membrane element which has an element configuration having high fresh water production performance and high removal performance, has an improved membrane surface linear velocity whereby fouling due to hardly-soluble salts (scales) or organic matters is less likely to occur on the membrane surface particularly in high recovery ratio operation, and is excellent in fresh water production performance and removal performance over a long period of time.

Separation membrane element and operation method therefor

The present invention addresses the problem of providing a separation membrane element with which it is possible to stabilize the separation removal performance when a separation membrane element is operated. The present invention is a separation membrane element provided at least with a collecting pipe, a separation membrane, a feed-side channel material, and a permeation-side channel material, wherein: the feed-side channel material is configured from a fibrous column X configured from a plurality of fibrous materials A arranged in one direction and a fibrous column Y configured from a plurality of fibrous materials B arranged in a different direction to the fibrous column X; the fibrous materials A intersect the fibrous materials B to form intersections; and the fibrous materials A and/or the fibrous materials B have a small-diameter part and a large-diameter part between adjacent intersections in a section plane parallel to the respective fibrous column.

Separation membrane element

According to the present invention, even when a high recovery ratio operation is performed, the influence of concentration of ingredients to be separated in the feed fluid can be reduced, the concentration polarization can be prevented by increasing the turbulence effect on the membrane surface, and the fluid permeation performance and the separation performance of the separation membrane element can be maintained.

In order to provide a composite semipermeable membrane which combines strength and water permeability, the present invention provides a composite semipermeable membrane including: a supporting membrane including a substrate and a porous support; and a separation functional layer disposed on the porous support, in which the substrate has a weight A per unit area, a portion of the porous support which is located within the substrate has a weight B per unit area, and a sum of the weight A and the weight B, (A+B), is 30 to 100 g/m, and a ratio between the weight A and the weight B, B/A, is 0.10 to 0.60.

Composite semipermeable membrane

The present invention relates to a separation membrane element including: a separation membrane; and a permeate-side channel material disposed on a permeate side of the separation membrane, wherein the permeate-side channel material is a rugged sheet object having a recess and a protrusion on at least one face thereof, the rugged sheet object is composed of a porous region formed of a through-hole in a thickness direction of the rugged sheet and a non-porous region other than the porous region, and a rate of a number of the through-hole in the recess of the rugged sheet object to a total number of the through-hole present in the rugged sheet object is 80% or more.

The purpose of the present invention is to provide a composite semipermeable membrane having achieved both strength and water-permeable properties. This composite semipermeable membrane is provided with a substrate, a porous support body disposed on the substrate, and a separation function layer provided on the porous support body. The substrate has a structure provided with a crimped portion and a non-crimped portion. The porous support body is impregnated inside a crimped portion and inside a non-crimped portion of the substrate.

A separation membrane element of the present invention includes: a separation membranes each having a feed-side face and a permeate-side face and forming a separation membrane pair by being arranged so that the permeate-side faces face each other; and a permeate-side channel material provided between the permeate-side faces of the separation membranes, the permeate-side channel material includes a sheet and a plurality of projections formed on the sheet, the sheet is a porous sheet having pores on a surface thereof, and has densely fused parts, coarsely fused parts and non-fused parts on the surface, and the projections contain a resin, and a part of the resin is impregnated into the pores of the sheet.

The present invention provides a separation membrane and a separation membrane element capable of exhibiting a good water production performance even at a high temperature and also excellent handleability and quality. The separation membrane of the present invention includes a separation membrane main body having a feed-side face and a permeate-side face; and a permeate-side channel member fixed onto the permeate-side face of the separation membrane main body, and the permeate-side channel member includes polypropylene as a main component and satisfies the following requirements (a) to (c): (a) a softening point temperature is 60&#xb0; C. or higher; (b) a tensile elongation in a standard state is 10% or more; and (c) a yield point stress under a wet condition at 50&#xb0; C. is 2 MPa or more.

Separation membrane, sheet channel material, and separation membrane element

A separation membrane element of the present invention includes: a water collection tube; and a plurality of separation membrane leaves stacked on each other and wound around the water collection tube, each of the separation membrane leaves includes one or more separation membranes each having a feed-side face and a permeate-side face and is configured so that the feed-side faces face each other, and a sheet having a plurality of projections fixed thereto is provided between the permeate-side faces of the separation membrane leaves stacked on each other. Regarding a height of the projections, a ratio of the maximum height to the minimum height is from 1.10 to 1.50, and a variation coefficient of the height is from 0.02 to 0.15, and an impregnation ratio of the projections into the sheet is from 10% to 100%.

The present invention provides a separation membrane and a separation membrane element which are capable of exhibiting good water production performance and excellent in handleability and process passage. A separation membrane of the present invention is a separation membrane including: a separation membrane main body having a feed-side face and a permeate-side face; and a permeate-side channel member adhered to the permeate-side face of the separation membrane main body, in which the permeate-side channel member includes a composition containing at least a high-crystalline polypropylene (A) and satisfies the following requirements (a) and (b):

Separation membrane, sheet flow path material, and separation membrane element

A spiral separation membrane element including a plurality of separation membrane pairs wound around the outer peripheral surface of a water collection pipe, wherein the plurality of separation membranes include at least two sets of separation membrane pairs in which two adjacent separation membranes are stacked such that the water supply sides of the separation membranes form opposing surfaces, and the water supply-side surfaces at the ends of separation membranes close to the water collection pipe and parallel to the lengthwise direction of the water collection pipe are sealed by a sealing material.

Spiral separation membrane element and method for producing same

A separation membrane element includes a water collecting pipe, a separation membrane main body having a feed-side face and a permeate-side face, a feed-side channel material and permeate-side channel materials. The separation membrane main body, the feed-side channel material and the permeate-side channel materials are spirally wound around the water collecting tube. A plurality of the permeate-side channel materials are discontinuously provided on the permeate-side face of the separation membrane main body, along a first direction that is a longitudinal direction of the water collecting pipe. The feed-side channel material has a thickness of from 0.15 to 0.5 mm.

A separation membrane includes a separation membrane main body having at least a substrate and a separation function layer; and a channel material having a composition different from that of the separation membrane main body and affixed to a substrate-side surface of the separation membrane main body, wherein the channel material is discontinuous in a first direction and continuous in a second direction from one end to another end of the separation membrane main body.

Separation membrane, separation membrane element, and method for producing separation membrane

A spiral separation membrane element includes a water collection tube; a separation membrane wound around the water collection tube, having a feed-side surface and a permeate-side surface, and including a band-shaped region on at least one end of the feed-side surface in an axial direction of the water collection tube; and a channel material fused to the band-shaped region.

Separation membrane element and production method for same

To provide a separation membrane element that is able to increase the amount of permeate fluid per unit time and also able to improve stability performance, provided is a separation membrane element, comprising a separation membrane and a permeate spacer, wherein a separation functional layer is arranged on the surface of said separation membrane and a nonwoven fabric served as a substrate is arranged on the back surface of said separation membrane, wherein said permeate spacer is arranged on the back surface side of said substrate, wherein said permeate spacer is made of a different material from said separation membrane, and a projection area ratio of said permeate spacer to said separation membrane is 0.03 to 0.80.

Growing community of inventors

Shiga, Japan

Hiroho Hirozawa