Toray Industries, Inc.

Yoshiki Okamoto

Hiroho Hirozawa

Masahiro Kimura

Kentaro Takagi

Hiroyuki Yamada

Takao Sasaki

Masakazu Koiwa

Shuji Furuno

Shunsuke Tabayashi

Yoshie Marutani

Norihiro Takeuchi

Tsuyoshi Hamada

Atsushi Kobayashi

Tamotsu Kitade

Shun Shimura

Yuji Tanaka

Katsufumi Oto

Akshay Garg

Shigehisa Hanada

Akira Katayama

Kentarou Takagi

Hiroshi Umetani

Yasuo Seike

Shinichiro Yoshidomi

Takagi Kentaro

The present invention relates to a membrane separation system including a plurality of separation membrane elements connected to one another, each of the separation membrane elements including a plurality of separation membrane pairs, each separation membrane pair including separation membranes each having a feed-side surface and a permeate-side surface and disposed such that the feed-side surfaces face each other, in which the plurality of separation membrane elements include a first separation membrane element and a second separation membrane element, and at least one first separation membrane element serves as a stage preceding the second separation membrane element.

Membrane separation system and operation method for membrane separation system

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.

Separation membrane element

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 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 hollow-fiber membrane module of the invention includes: a cylindrical case having a first end and a second end in a height direction thereof; a hollow-fiber membrane bundle being housed in the cylindrical case and having a plurality of hollow-fiber membranes each closed at an end part on the first end side and opened at an end part on the second end side; a first binding part binding the end parts on the first end side of the hollow-fiber membranes; a first flow channel guiding fluid to pass through the first binding part from the first end side to the second end side of the first binding part; and a channel material directing, at a terminal on the second end side of the first flow channel, a flow of at least a part of the fluid flowing out from the terminal on the second end side of the first flow channel toward a direction intersecting the height direction of the cylindrical case.

Hollow fiber membrane module and method for manufacturing hollow fiber membrane module

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 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.

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Otsu, Japan

Yoshiki Okamoto