Toray Industries, Inc.

Ryoma Miyamoto

Koji Nakatsuji

Masahiro Kimura

Masakazu Koiwa

Kentaro Takagi

Satoko Kanamori

Hiroaki Tanaka

Tsuyoshi Hamada

Ryuichiro Hiranabe

Jun Okabe

Keisuke Yoneda

Yoichiro Kozaki

Kumiko Ogawa

An object of the present invention is to provide a separation membrane having high permeability and selective removability of divalent/monovalent ions. The separation membrane of the present invention includes a supporting membrane and a separation functional layer formed on the supporting membrane, in which the separation functional layer contains a polymerized product of a polyfunctional amine with a polyfunctional acid halide, the polyfunctional amine contains a polyfunctional aliphatic amine as a main component, the separation functional layer has a hollow protuberant structure, and the separation functional layer has a relative surface area of 1.1-10.0.

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

The present invention provides a filter which, even when raw water is subjected to high-speed treatment, enables achieving a high solute rejection ratio and a long solute filtration life and which exhibits a low water flow resistance. The present invention pertains to a filter obtained by laminating woven fabrics or knitted fabrics, the filter being characterized in that: said woven fabrics or knitted fabrics comprise a fiber capable of adsorbing components dissolved in liquid: said fiber has a diameter of 100-600 &#x3bc;m; the woven fabrics or knitted fabrics have a porosity of 15-70%; and variation in area porosity in the thickness direction of the laminate is 15% or less.

Filter

The present invention provides a separation membrane that is usable at a high temperature and a high pressure. The solvent-resistant separation membrane of the present invention has an average pore diameter of the separation membrane surface of 0.005 to 1 &#x3bc;m and includes a portion where a degree of cyclization (I/I) as measured by the total reflection infrared absorption spectroscopy is 0.5 to 50.

Solvent-resistant separation membrane

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Shiga, Japan

Ryoma Miyamoto