초록 ▼

An aromatic copolyimide gas separation membrane and the process of using it to separate one or more gases from a mixture of gases are disclosed. The aromatic copolyimide is the condensation product of a aromatic tetracarboxylic dianhydride with a phenylene diamine and a methylene dianiline both of w

An aromatic copolyimide gas separation membrane and the process of using it to separate one or more gases from a mixture of gases are disclosed. The aromatic copolyimide is the condensation product of a aromatic tetracarboxylic dianhydride with a phenylene diamine and a methylene dianiline both of which diamines are substituted with alkyl groups on all positions ortho to the amino groups.

대표청구항 ▼

A process for separating one or more gases from a mixture of gases comprising bringing said mixture of gases into contact with a gas separation membrane formed from an aromatic copolyimide consisting essentially of repeating units of the formula: [Figure] where －Ar－is [Figure] [Figure] or mixtures t

A process for separating one or more gases from a mixture of gases comprising bringing said mixture of gases into contact with a gas separation membrane formed from an aromatic copolyimide consisting essentially of repeating units of the formula: [Figure] where －Ar－is [Figure] [Figure] or mixtures thereof, －Ar′－is [Figure] or mixtures thereof, is [Figure] [Figure] [Figure] or mixtures thereof －X, －X1, －X2 and －X3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, －Z is －H, －X1, －X2, or －X3 －Y and －Y1 are independently －H, －X, －X1, －X2, －X3 or halogen and －R′－is [Figure] [Figure] [Figure] where n=0 to 4 or alkylene radicals of 1 to 3 carbon atoms, and where r=15 to 95 mol %, t=5 to 85 mol %, s=100%.