Composite separator for gas separation
Provided is a composite separator for gas separation. According to an aspect of the present disclosure, a composite separator for gas separation includes a support and a selective layer disposed on one surface of the support, wherein the support includes a porous polyethylene film, and has a surface roughness of 100 nm or less, a surface median pore diameter of 300 nm or less, and a tensile strength in a machine direction (MD) and a transverse direction (TD) of 10 MPa or more.
1 . A composite separator for gas separation, the composite separator comprising:
a support including a porous polyethylene film;
a selective layer; and
a middle layer including a siloxane-based polymer or a polyacetylene-based polymer disposed between the support and the selective layer,
wherein the support has a surface roughness of 100 nm or less, a surface median pore diameter of 300 nm or less, and a tensile strength in a machine direction (MD) and a transverse direction (TD) of 10 MPa or more.
2 . The composite separator for gas separation of claim 1 , wherein the porous polyethylene film has a gas permeability of 850 sec/100 cc or less.
3 . The composite separator for gas separation of claim 1 , wherein the support has a surface roughness of 50 nm or less.
4 . The composite separator for gas separation of claim 1 , wherein the support has a thickness ranging from 5 μm to 100 μm.
5 . The composite separator for gas separation of claim 1 , wherein the selective layer has a thickness ranging from 10 nm to 500 nm.
6 . The composite separator for gas separation of claim 1 , further comprising: a protective layer disposed on the selective layer.
7 . The composite separator for gas separation of claim 1 , wherein the composite separator has a thickness of 150 μm or less.
8 . The composite separator for gas separation of claim 1 , wherein a specific surface area of the selective layer according to the following Equation is 10,000 m 2 /m 3 or more:
Specific surface area of selective layer=surface area of selective layer (m 2 )/volume of composite separator (m 3 ). [Equation 1]
9 . A gas separation method comprising separating a specific gas from a gas mixture using the composite separator of claim 1 .
10 . The gas separation method of claim 9 , wherein the specific gas is selected from the group consisting of carbon dioxide, hydrogen, helium, oxygen, hydrocarbon, and olefin.
11 . The composite separator for gas separation of claim 6 , wherein the protective layer comprises a siloxane-based polymer.
12 . The composite separator for gas separation of claim 6 , wherein the protective layer has a thickness of 100 to 2000 nm.
13 . The composite separator for gas separation of claim 6 , wherein the middle layer has a thickness of 100 to 500 nm.