Gas separation membrane, gas separation module, gas separation device, gas separation method, and polyimide compound
A gas separation membrane includes a gas separation layer containing a polyimide compound having a repeating unit represented by Formula (I), in Formula (I), R I represents a hydrogen atom, an alkyl group, or a halogen atom, X a represents a sulfamoyl group, an alkoxysulfonyl group, a carboxy group, a hydroxy group, an acyloxy group, or a halogen atom, and R represents a mother nucleus having a specific structure.
1. A gas separation membrane comprising:
a gas separation layer containing a polyimide compound,
wherein the polyimide compound has a repeating unit represented by Formula (I),
in Formula (I), R I represents a hydrogen atom, an alkyl group, or a halogen atom, and X a represents a sulfamoyl group, an alkoxysulfonyl group, a carboxy group, a hydroxy group, an acyloxy group, or a halogen atom, and
R represents a group having a structure represented by any of Formulae (I-1) to (I-28), where X 1 to X 3 each independently represent a single bond or a divalent linking group, L represents —CH═CH— or —CH 2 —, R 1 and R 2 each independently represent a hydrogen atom or a substituent, and the symbol “*” represents a binding site with respect to a carbonyl group in Formula (I)
2. The gas separation membrane according to claim 1 ,
wherein the repeating unit represented by Formula (I) is a repeating unit represented by Formula (I-a),
in Formula (I-a), R and X a each have the same definitions as those for R and X a in Formula (I).
3. The gas separation membrane according to claim 2 ,
wherein the repeating unit represented by Formula (I-a) is a repeating unit represented by Formula (I-b),
in Formula (I-b), R has the same definition as that for R in Formula (I-a), and R II represents a hydrogen atom or a substituent.
4. The gas separation membrane according to claim 3 ,
wherein the repeating unit represented by Formula (I-b) is a repeating unit represented by Formula (I-c),
in Formula (I-c), R has the same definition as that for R in Formula (I-b).
5. The gas separation membrane according to claim 1 ,
wherein the polyimide compound has at least one repeating unit selected from a repeating unit represented by Formula (II-a) and a repeating unit represented by Formula (II-b) or does not have both of the repeating unit represented by Formula (II-a) and the repeating unit represented by Formula (II-b),
in Formulae (II-a) and (II-b), R has the same definition as that for R in Formula (I), R 4 to R 6 each independently represent a substituent, l1, m1, and n1 each independently represent an integer of 0 to 4, and X 4 represents a single bond or a divalent linking group, where the repeating unit represented by Formula (II-a) does not include the repeating unit represented by Formula (I).
6. The gas separation membrane according to claim 5 ,
wherein the ratio of the molar amount of the repeating unit represented by Formula (I) to the total molar amount of the repeating unit represented by Formula (I), the repeating unit represented by Formula (II-a), and the repeating unit represented by Formula (II-b) in the polyimide compound is in a range of 50% to 100% by mole.
7. The gas separation membrane according to claim 6 ,
wherein the polyimide compound consists of the repeating unit represented by Formula (I) or the remainder other than the repeating unit represented by Formula (I) consists of the repeating unit represented by Formula (II-a) or (II-b) in a case where the polyimide compound has a repeating unit other than the repeating unit represented by Formula (I).
8. The gas separation membrane according to claim 1 ,
wherein the polyimide compound is a polyimide compound in which a cross-linked structure is formed using a metal alkoxide as a crosslinking agent.
9. The gas separation membrane according to claim 1 ,
wherein the gas separation membrane is a gas separation composite membrane which includes a gas permeating support layer and the gas separation layer on the upper side of the support layer.
10. The gas separation membrane according to claim 9 ,
wherein the support layer includes a non-woven fabric layer and a porous layer in this order.
11. The gas separation membrane according to claim 1 ,
wherein, in a case where gas to be subjected to a separation treatment is mixed gas of carbon dioxide and methane, a permeation rate of carbon dioxide at 30° C. and 5 MPa is greater than 20 GPU and a ratio (R CO2 /R CH4 ) between permeation rates of carbon dioxide and methane is 15 or greater.
12. The gas separation membrane according to claim 1 , which is used for selective permeation of carbon dioxide from gas containing the carbon dioxide and methane.
13. A gas separation module comprising:
the gas separation membrane according to claim 1 .
14. A gas separation device comprising:
the gas separation module according to claim 13 .
15. A gas separation method comprising:
selectively permeating carbon dioxide from gas containing the carbon dioxide and methane using the gas separation membrane according to claim 1 .
16. A polyimide compound having a repeating unit represented by Formula (I),
in Formula (I), R I represents a hydrogen atom, an alkyl group, or a halogen atom, and X a represents a sulfamoyl group, an alkoxysulfonyl group, a carboxy group, a hydroxy group, an acyloxy group, or a halogen atom, and
R represents a group having a structure represented by any of Formulae (I-1) to (I-28), where X 1 to X 3 each independently represent a single bond or a divalent linking group, L represents —CH═CH— or —CH 2 —, R 1 and R 2 each independently represent a hydrogen atom or a substituent, and the symbol “*” represents a binding site with respect to a carbonyl group in Formula (I)