Gas separation membrane, gas separation module, gas separation apparatus, and gas separation method

A gas separation membrane comprising:

• a gas separation layer containing a poly(benzoxazole-imide) compound,
• wherein the poly(benzoxazole-imide) compound has a structural unit represented by General formula (I), a structural unit represented by General formula (II), and a structural unit represented by General formula (III), and
• in the poly(benzoxazole-imide) compound, the molar quantity m of the structural unit represented by General formula (I), the molar quantity n of the structural unit represented by General formula (II), and a molar quantity q of the structural unit represented by General formula (III) satisfy the following Mathematical expression:
• 0.25≤m/(n+q)≤9.00(0<n, 0<q),
• where X and Y each represent a single bond, a divalent linking group selected from Group (IV) of linking groups, or a divalent linking group formed by combining one or two or more linking groups selected from Group (IV);
• L represents a divalent linking group selected from Group (V);
• and
• R represents a hydrogen atom, COR1, or Si(R2)3 where R1 and R2 each represent an alkyl group,

A gas separation membrane comprising:

• a gas separation layer containing a poly(benzoxazole-imide) compound,
• wherein the poly(benzoxazole-imide) compound has a structural unit represented by General formula (I), a structural unit represented by General formula (II), and a structural unit represented by General formula (III), and
• in the poly(benzoxazole-imide) compound, the molar quantity m of the structural unit represented by General formula (I), the molar quantity n of the structural unit represented by General formula (II), and a molar quantity q of the structural unit represented by General formula (III) satisfy the following Mathematical expression:
• 0.25≤m/(n+q)≤9.00(0<n, 0<q),
• where X and Y each represent a single bond, a divalent linking group selected from Group (IV) of linking groups, or a divalent linking group formed by combining one or two or more linking groups selected from Group (IV);
• L represents a divalent linking group including a phenylene group provided that the phenylene group does not have an —OR group as a substituent;
• and
• R represents a hydrogen atom, COR1, or Si(R2)3 where R1 and R2 each represent an alkyl group,
• and
• the gas separation layer is formed by heat-treating a layer containing a polyimide compound having a structural unit represented by General formula (II) and a structural unit represented by General formula (III).