GAS SEPARATION COMPOSITE MEMBRANE, METHOD OF PRODUCING THE SAME, GAS SEPARATING MODULE USING THE SAME, AND GAS SEPARATION APPARATUS AND GAS SEPARATION METHOD

摘要

A gas separation composite membrane, containing: a gas-permeable supporting layer; and a gas separating layer containing a crosslinked polyimide resin, over the gas-permeable supporting layer, in which the crosslinked polyimide resin is composed of a polyimide compound having been crosslinked through an ester linking group, in which the polyimide compound contains a repeating unit of formula (I), a repeating unit of formula (II-a) or (II-b), and a repeating unit of formula (III-a) or (III-b), and in which a ratio [κ] of a site forming a crosslinked chain mediated by the ester linking group to an imide group (the number of specific crosslinkable sites/the number of imide groups) is more than 0.4 and less than 0.5.

主权项

1. A gas separation composite membrane, containing:
a gas-permeable supporting layer; and a gas separating layer containing a crosslinked polyimide resin, over the gas-permeable supporting layer,wherein the crosslinked polyimide resin is composed of a polyimide compound having been crosslinked through an ester linking group,wherein the polyimide compound contains a repeating unit represented by formula (I), a repeating unit represented by formula (II-a) or (II-b), and a repeating unit represented by formula (III-a) or (III-b), andwherein a ratio [κ] of a site forming a crosslinked chain mediated by the ester linking group to an imide group (the number of specific crosslinkable sites/the number of imide groups) is more than 0.4 and less than 0.5:wherein, in formula (I), R is a group of atoms selected from the group consisting of groups represented by any one of formulas (I-a) to (1-g); X1 represents a single bond or a divalent linking group; Y1 represents a methylene group or a vinylene group; R1 and R2 each independently represent a hydrogen atom or a substituent; and the symbol “*” represents a binding site;wherein, in formulas (II-a) and (II-b), R3, R4 and R5 each independently represent a substituent; l1, m1 and n1 each independently are an integer of from 0 to 4; and X2 represents a single bond or a divalent linking group; andwherein, in formulas (III-a) and (III-b), R6, R7 and R8 each independently represent a substituent; J1, J2 and W1 each independently represent a single bond or a divalent linking group; l2, m2 and n2 each independently are an integer of from 0 to 3; L1 represents a divalent linking group; L2 represents a crosslinkable functional group; p represents an integer of 0 or more; X3 represents a single bond or a divalent linking group; and -J1-W1-(L1-J2)p-L2 is a site for forming a crosslinked chain mediated by the ester linking group upon being crosslinked.