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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): [Figure] (I) wherein R is a tetravalen

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): [Figure] (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 1×10-5 to 5×10-1 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°C. or more.

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An aromatic polyimide gas-separating membrane comprising: a substrate consisting of an aromatic polyimide porous membrane which comprises an aromatic polyimide material consisting essentially of at least one aromatic polyimide having at least 80 molar % of at least one type of recurring unit of the

An aromatic polyimide gas-separating membrane comprising: a substrate consisting of an aromatic polyimide porous membrane which comprises an aromatic polyimide material consisting essentially of at least one aromatic polyimide having at least 80 molar % of at least one type of recurring unit of the formula (I): [Figure] (I) wherein R represents a tetravalent aromatic radical and R1 represents a divalent aromatic radical and which exhibits a hydrogen gas permeability (PH2) of from 1×10-5 to 5×10-1 cm3/cm2.sec.cmHg and a ratio (PH2/PCO) of hydrogen gas permeability (PH2) to carbon monoxide gas permeability (PCO) of 2 to 5, determined under a pressure of 1 kg/cm2; and at least 50%, based on the weight of said porous membane substrate, of a gas-separating liquid uniformly impregnated in said porous membrane substrate said gas-separating liquid consisting essentially of at least one liquid naphthalene compound substantially incapable of dissolving therein said porous membrane substrate, and having a boiling point of at least 180°C.