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MULTILAYER AROMATIC POLYAMIDE THIN-FILM COMPOSITE MEMBRANES FOR SEPARATION OF GAS MIXTURES
MULTILAYER AROMATIC POLYAMIDE THIN-FILM COMPOSITE MEMBRANES FOR SEPARATION OF GAS MIXTURES
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机译:用于分离气体混合物的多层芳族聚酰胺薄膜复合膜
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摘要
A gas separation membrane for selective separation of hydrogen and helium from gas mixtures containing carbon dioxide includes a porous support layer, an aromatic polyamide layer on the porous support layer, and a coating including a glassy polymer formed on the aromatic polyamide layer. A glass transition temperature of the glassy polymer is greater than 50° C. The gas separation membrane may be formed by contacting a solution including the glassy polymer with an aromatic polyamide layer of a composite membrane and drying the solution to form a coating of the glassy polymer on the aromatic polyamide layer. Separating hydrogen or helium from a gas stream including carbon dioxide includes contacting a gas feed stream including carbon dioxide with the gas separation membrane to yield a permeate stream having a concentration of helium or hydrogen that exceeds the concentration of helium or hydrogen, respectively, in the gas feed stream.
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