Toray Industries, Inc.

Tsuyoshi Hamada

Masahiro Kimura

Koji Nakatsuji

Jun Okabe

Hiroho Hirozawa

Masakazu Koiwa

Kentaro Takagi

Yoshiki Okamoto

Hiroyuki Yamada

Takafumi Ogawa

Harutoki Shimura

Katsufumi Oto

Masaki Higashi

Ryoma Miyamoto

Tomoya Yoshizaki

Masami Ogata

Yasuo Seike

The present invention relates to a composite semipermeable membrane including: a substrate; a porous support layer disposed on the substrate; and a separation functional layer disposed on the porous support layer, in which the separation functional layer includes: a first layer including a crosslinked aromatic polyamide; and a coating layer existing on the first layer and including an aliphatic polyamide including a fluorine atom, and the composite semipermeable membrane has a proportion of the number of fluorine atoms to the total number of atoms of all elements of 0.5% or more and 8% or less, and has a ratio (N/O ratio) of the number of nitrogen atoms to the number of oxygen atoms of 0.8 or more and 1.3 or less.

Composite semipermeable membrane

The present invention relates to a composite semipermeable membrane including: a supporting membrane including a substrate and a porous supporting layer; and a separation functional layer disposed on the porous supporting layer, in which the separation functional layer includes: a crosslinked polyamide; and a hydrophilic polymer which is a polymer of a monomer having an ethylenically unsaturated group, and a surface of the separation functional layer has a ratio of the number of oxygen atoms to the number of nitrogen atoms (O/N ratio), both determined by X-ray photoelectron spectrometry, of 1.5-10, and a standard deviation of the O/N ratio of 0.15 or larger.

Composite semipermeable membrane and method for producing composite semipermeable membrane

An object of the present invention is to provide a composite semipermeable membrane which has a high permeation rate and high salt removal performance and is excellent in terms of performance stability during long-term operation. The composite semipermeable membrane of the present invention includes: a supporting membrane including a substrate and a porous supporting layer; and a separation functional layer disposed on the porous supporting layer, the separation functional layer includes a crosslinked polyamide and a hydrophilic polymer having an acidic group, and in the separation functional layer, a ratio of (molar equivalent of amino groups)/(molar equivalent of amide groups) is 0.18 or less.

Composite semipermeable membrane and method for producing same

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

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.

Separation membrane element

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

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Otsu, Japan

Tsuyoshi Hamada