Toray Industries, Inc.

Ryuichiro Hiranabe

Hiroki Tomioka

Koichi Takada

Gohei Yamamura

Masayuki Hanakawa

Satoko Kanamori

Ryoma Miyamoto

Keisuke Yoneda

Tomonori Kawakami

Yoichiro Kozaki

Kumiko Ogawa

A problem to be solved by the present invention is to provide a separation membrane having excellent separation performance, having high membrane strength and high permeation performance, and mainly including a cellulose-based resin. The present invention is concerned with a separation membrane including a cellulose ester, having, in the interior thereof, voids each having a specified structure, and having a tensile elasticity of 1,000 to 6,500 MPa.

Separation membrane

The present invention provides a separation membrane having excellent separation performance and permeation performance, having high membrane strength, and mainly including a cellulose-based resin. The present invention relates to a separation membrane containing a cellulose ester and having a tensile elasticity of 1,500 to 6,500 MPa.

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

Problems that the invention is to solve is to provide a composite hollow fiber membrane being excellent in separation performance and permeation performance, having high membrane strength, and capable of being easily produced, and a method for producing the same. The present invention relates to a composite hollow fiber membrane including at least a layer (A) and a layer (B), in which the composite hollow fiber membrane has an outer diameter of 20 to 350 &#x3bc;m and an inner diameter of 14 to 250 &#x3bc;m, the tensile modulus of the composite hollow fiber membrane is from 1,000 to 6,500 MPa, the layer (A) contains a cellulose ester, the thickness of the layer (A) is from 0.01 to 5 &#x3bc;m, and the open pore ratio Hof the layer (A) and the open pore ratio Hof the layer (B) satisfy H&#x3c;H.

Composite hollow fiber membrane and method for producing same

A carbon dioxide separation membrane includes a skin layer having a function of separating carbon dioxide from a mixed gas, wherein the skin layer contains 30 to 90% by mass of a polymer resin in which a difference between an affinity to carbon dioxide and an affinity to at least one of hydrogen and helium, the affinities are expressed as free energy &#x394;G (kcal mol), is 4.5 kcal molor more and less than 10 kcal mol, and from 10 to 70% by mass of an organic liquid having an affinity to carbon dioxide.

Growing community of inventors

Shiga, Japan

Ryuichiro Hiranabe