Separation composite membrane and separating membrane module using the same

Patent metadata

Field	Value
Publication number	US-9314736-B2
Application number	US-201414457200-A
Country	US
Kind code	B2
Filing date	Aug 12, 2014
Priority date	Feb 16, 2012
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A separation composite membrane including: a separating layer for separating fluid components, the separating layer being constituted of a polymer having cross-linked structure, and a porous layer for supporting the separating layer, the porous layer having a maximum pore diameter of 0.05 to 0.5 μm, the separating layer being partly impregnated into the porous layer in the range of 0.1 to 30% in terms of the impregnation amount ratio (ηa) defined by Formula (A):

[impregnation amount ratio (η a ){%}=impregnation depth ( s )/(membrane thickness ( t 1 ) of separating layer)×100]  (A).

First claim

The invention claimed is:

1. A separation composite membrane comprising:
a separating layer for separating fluid components, the separating layer being constituted of polyimide resin having a cross-linked structure, and
a porous layer for supporting the separating layer, the porous layer having a maximum pore diameter of 0.05 to 0.5 μm, and the porous layer being constituted of at least a resin selected from the group consisting of a polyacrylonitrile resin, a polysulfone resin, a cellulose resin, a fluorocarbon resin, a polyether sulfone resin, a polyamide resin and a polyolefin resin,
the separating layer being partly impregnated into the porous layer in the range of 5 to 30% in terms of the impregnation amount ratio (ηa) defined by Formula (A):
[impregnation amount ratio (η a ){%}=impregnation depth ( s )/(membrane thickness ( t 1 ) of separating layer)×100]  (A).

2. The separation composite membrane according to claim 1 , wherein the separating layer is defined in a polymer membrane having a cross-linked structure with a loss modulus in the range of 1 to 1,000 MPa.

3. The separation composite membrane according to claim 1 , wherein a water contact angle on a surface of the porous layer on a side of the separating layer is 35 degrees or more.

4. The separation composite membrane according to claim 1 , wherein an impregnation amount ratio (ηb) determined from the impregnation depth (s) and a membrane thickness (t 2 ) of the porous layer according to Formula (B) is in the range of 0.01 to 20%:
[impregnation amount ratio (η b ){%}=impregnation depth ( s )/(membrane thickness ( t 2 ) of the porous layer)×100]  (B).

5. The separation composite membrane according to claim 1 , wherein an impregnation amount ratio (ηc) determined from the impregnation depth (s) and a total thickness (D) of the separating layer and the porous layer according to Formula (C) is in the range of 0.01 to 20%:
[impregnation amount ratio (η c ){%}=impregnation depth ( s )/(total thickness ( D ) of the separating layer and the porous layer)×100]  (C).

6. A separating membrane module, having the separation composite membrane according to claim 1 .

7. A fluid separation system, comprising the separating module according to claim 6 .

Assignees

• Fujifilm Corp

Inventors

• Itou Shigehide

Classifications

• B01D2257/304

  Hydrogen sulfide · CPC title

• B01D2325/24

  Mechanical properties, e.g. strength · CPC title

• B01D69/02

  characterised by their properties · CPC title

• B01D2258/05

  Biogas · CPC title

• B01D53/22

  by diffusion (manufacturing semi-permeable membranes B01D67/00; form, structure or properties of semi-permeable membranes B01D69/00; material for semi-permeable membranes B01D71/00) · CPC title