Composite membrane for use in gas separation

Details Composite membrane for use in gas separation Composite membrane for use in gas separation

B - Operations, Transporting

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117/88.5

B01D 71/26 (2006.01) B01D 69/12 (2006.01) B01D 71/28 (2006.01) B01D 71/68 (2006.01) C08J 5/18 (2006.01) C08J 7/04 (2006.01)

Patent

CA 1272078

ABSTRACT OF THE DISCLOSURE There is disclosed a composite membrane compris- ing [A] a polysulfone type porous membrane capable of rejecting 90 % or more of dextran molecules having a weight average molecular weight of 70,000 and [B] a specific styrene type resin coated on at least one side of the polysulfone type porous membrane in a thickness of 5 µm or less and in an amount of 1 x 10-7 g/cm2 of the polysulfone type porous membrane, the styrene type resin being selected from the group con- sisting of (I) a specific styrene type linear polymer having a weight average molecular weight of 1 x 10-5 or more, (II) a specific blend polymer prepared by blending at least two different styrene type linear polymers each as defined above and (III) a specific crosslinked polymer selected from the group consisting of (i) one prepared by crosslinking a styrene type linear polymer having a weight average molecular weight of 1 x 10-3 or more and (ii) one prepared by blending at least two different styrene type linear polymers each having a weight average molecular weight of 1 x 103. Such a composite membrane has been found to be advantageously employed for gas separation because of its high gas permeability and high selec- tive gas permeability.

503888

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