| 摘要 |
<p>An aromatic polyimide membrane having an excellent gas-separating property comprises (A) a substrate consisting of a porous membrane comprising at least one aromatic polyimide having at least 80 molar % of at least one type of recurring unit of the formula (I): <IMAGE> (I) wherein R is a tetravalent aromatic radical and R1 is a divalent aromatic radical, the porous membrane exhibiting a hydrogen gas permeability (PH2) of 1x10-5 to 5x10-1 cm3/cm2.sec.cmHg and a ratio of hydrogen gas permeability (PH2) to carbon monoxide gas permeability (PCO) of 2 to 5; and (B) 50% or more, based on the weight of the porous membrane substrate, of a gas-separating liquid contained in the porous membrane substrate, the gas-separating liquid being substantially incapable of dissolving therein the porous membrane substrate and having a boiling point of 180 DEG C. or more.</p> |
