Method of making membranes for gas separation and the...

Details Method of making membranes for gas separation and the... Method of making membranes for gas separation and the...

B - Operations, Transporting

01

D

117/88.5

B01D 69/12 (2006.01) B01D 71/70 (2006.01)

Patent

CA 1241241

METHOD OF MAKING MEMBRANES FOR GAS SEPARATION AND THE COMPOSITE MEMBRANES Abstract Composite membranes suitable for separating gas mixtures are made by in situ crosslinking of aminoorgano- functional polysiloxane, 1 to 9 mol percent aminosiloxane units, with diisocyanate on the surface of a highly porous polymer substrate, such as polysulfone. Using the crosslinked polysiloxane as a gutter layer, a gas separating entity can be coated on the gutter layer to make a double layer composite membrane which has a higher separation factor than the crosslinked polysiloxane and can be used effectively for flat sheet membranes, as well as, hollow fiber membranes.

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