Gas Separation Membrane

Patent metadata

Field	Value
Publication number	US-2024399300-A1
Application number	US-202418675308-A
Country	US
Kind code	A1
Filing date	May 28, 2024
Priority date	May 29, 2023
Publication date	Dec 5, 2024
Grant date	—

Abstract

A gas separation membrane for separating carbon dioxide from a mixed gas containing the carbon dioxide and a non-target component includes: a porous layer; and a separation layer formed of a polymer material and in close contact with one surface of the porous layer. A gas selectivity ratio RCO2/R0 is 8 or more and less than 100, where R0 is a gas permeability of the non-target component in the gas separation membrane and RCO2 is a gas permeability of the carbon dioxide in the gas separation membrane. A gas permeability ratio BCO2/ACO2 is 4.0 or more and 128.0 or less, where ACO2 is a gas permeability of the carbon dioxide in the separation layer and BCO2 is a gas permeability of the carbon dioxide in the porous layer.

First claim

What is claimed is:

1 . A gas separation membrane for separating carbon dioxide from a mixed gas containing the carbon dioxide and a non-target component, the gas separation membrane comprising:
a porous layer; and a separation layer formed of a polymer material and in close contact with one surface of the porous layer, wherein a gas selectivity ratio R CO2 /R 0 is 8 or more and less than 100, where R 0 is a gas permeability of the non-target component in the gas separation membrane and R CO2 is a gas permeability of the carbon dioxide in the gas separation membrane, and a gas permeability ratio B CO2 /A CO2 is 4.0 or more and 128.0 or less, where A CO2 is a gas permeability of the carbon dioxide in the separation layer and B CO2 is a gas permeability of the carbon dioxide in the porous layer.

2 . The gas separation membrane according to claim 1 , wherein
the polymer material contains an organopolysiloxane, and an average thickness of the separation layer is 10 nm or more and 800 nm or less.

3 . The gas separation membrane according to claim 1 , wherein
an area rate of a through hole penetrating the separation layer is more than 0% and 0.05% or less.

4 . The gas separation membrane according to claim 3 , wherein
the gas selectivity ratio R CO2 /R 0 is 20 or more and less than 30, and the gas permeability ratio B CO2 /A CO2 is 4.1 or more and 81.0 or less.

5 . The gas separation membrane according to claim 3 , wherein
the gas selectivity ratio R CO2 /R 0 is 30 or more and less than 40, and the gas permeability ratio B CO2 /A CO2 is 4.3 or more and 59.0 or less.

6 . The gas separation membrane according to claim 3 , wherein
the gas selectivity ratio R CO2 /R 0 is 40 or more and less than 50, and the gas permeability ratio B CO2 /A CO2 is 4.4 or more and 45.0 or less.

7 . The gas separation membrane according to claim 3 , wherein
the gas selectivity ratio R CO2 /R 0 is 50 or more and less than 60, and the gas permeability ratio B CO2 /A CO2 is 4.5 or more and 37.0 or less.

8 . The gas separation membrane according to claim 3 , wherein
the gas selectivity ratio R CO2 /R 0 is 60 or more and less than 70, and the gas permeability ratio B CO2 /A CO2 is 4.7 or more and 30.0 or less.

9 . The gas separation membrane according to claim 3 , wherein
the gas selectivity ratio R CO2 /R 0 is 70 or more and less than 80, and the gas permeability ratio B CO2 /A CO2 is 4.9 or more and 25.0 or less.

10 . The gas separation membrane according to claim 3 , wherein
the gas selectivity ratio R CO2 /R 0 is 80 or more and less than 90, and the gas permeability ratio B CO2 /A CO2 is 5.1 or more and 22.0 or less.

11 . The gas separation membrane according to claim 3 , wherein
the gas selectivity ratio R CO2 /R 0 is 90 or more and less than 100, and the gas permeability ratio B CO2 /A CO2 is 5.3 or more and 19.0 or less.

12 . The gas separation membrane according to claim 1 , wherein
the non-target component is nitrogen.

Assignees

• Seiko Epson Corp

Inventors

• Tadachi Kei
• Nakashima Taisuke

Classifications

• B01D2257/504

  Carbon dioxide · CPC title

• B01D67/0002

  Organic membrane manufacture · CPC title

• B01D71/70

  Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only · CPC title

• B01D53/228 Primary

  characterised by specific membranes · CPC title

• B01D2325/20

  Specific permeability or cut-off range · CPC title