| 主权项 |
1. A carbon dioxide separation membrane comprising a skin layer having a function of separating carbon dioxide from a mixed gas,
wherein the skin layer contains 30 to 90% by mass of a polymer resin in which a difference between an affinity to carbon dioxide and an affinity to at least one of hydrogen and helium, said affinities are expressed as free energy ΔG (kcal mol−l), is 4.5 kcal mol−1 or more and less than 10 kcal mol−l, and from 10 to 70% by mass of an organic liquid having an affinity to carbon dioxide, and the polymer resin is a polyamide having at least one of a repeating unit represented by the Formula (I) and a repeating unit represented by Formula (II):in which Ar3, Ar4 and Ar5 in Formulae (I) and (II) each are at least one group selected from the group consisting of groups represented by Formulae (III) and (IV):in which X, Y and Z in Formula (III) each are at least one group selected from the group consisting of —O—, —CH2—, —CO2—,—S—, —SO2— and —C(CH3)2—, and n in Formula (IV) is an integer of from 2 to 8. |
