Solvent-resistant separation membrane

Patent metadata

Field	Value
Publication number	US-10099183-B2
Application number	US-201515502414-A
Country	US
Kind code	B2
Filing date	Aug 7, 2015
Priority date	Aug 8, 2014
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

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 μm and includes a portion where a degree of cyclization (I 1600 /I 2240 ) as measured by the total reflection infrared absorption spectroscopy is 0.5 to 50.

First claim

The invention claimed is:

1. A solvent-resistant separation membrane comprising a substrate, a porous layer, and a separation functional layer on the porous layer,
wherein the substrate, the porous layer and the separation functional layer are superimposed in this order,
wherein the porous layer contains, as a main component thereof, a flameproofed polymer that is a polyacrylonitrile-based polymer having been subjected to a flameproofinq treatment by heat treatment,
wherein an average pore diameter of at least one surface of the porous layer is 0.005 to 1 μm and is measured by averaging pore diameter values obtained with a scanning electron microscope, and
the porous layer includes a portion where a degree of cyclization as measured by a total reflection infrared absorption spectroscopy is 0.5 to 50, wherein the degree of cyclization is a ratio of an absorption peak value at 1,600 cm −1 and an absorption peak value at 2,240 cm −1 (I 1600 /I 2240 ).

2. The solvent-resistant separation membrane according to claim 1 , wherein in the porous layer, the degree of cyclization is different at two arbitrary points in a thickness direction of the porous layer.

3. The solvent-resistant separation membrane according to claim 2 , wherein the degree of cyclization in the thickness direction is such that the degree of cyclization of one surface of the porous layer is higher, and the degree of cyclization becomes lower toward the other surface thereof.

4. The solvent-resistant separation membrane according to claim 2 , wherein the degree of cyclization is higher on both surfaces of the porous layer and becomes lower toward a central part thereof.

5. The solvent-resistant separation membrane according to claim 1 , wherein a ratio of the degree of cyclization of one surface of the porous layer to the other surface thereof is 1.1 or more.

6. The solvent-resistant separation membrane according to claim 1 , wherein the substrate contains polyphenylene sulfide.

Assignees

• Toray Industries

Inventors

• Okabe Jun
• Kimura Masahiro
• Nakatsuji Koji
• Hamada Tsuyoshi
• MIYAMOTO Ryoma

Classifications

• B01D2325/24

  Mechanical properties, e.g. strength · CPC title

• B01D71/56

  Polyamides, e.g. polyester-amides · CPC title

• B01D67/0095

  Drying · CPC title

• B01D2325/30

  Chemical resistance · CPC title

• B01D67/0083

  Thermal after-treatment · CPC title