Asymmetric membranes for use in nanofiltration

Details Asymmetric membranes for use in nanofiltration Asymmetric membranes for use in nanofiltration

B - Operations, Transporting

01

D

B01D 69/02 (2006.01) B01D 71/64 (2006.01)

Patent

CA 2649238

Improved integrally skinned asymmetric membranes for organic solvent nanofiltration, and their methods of preparation and use are disclosed. Membranes are formed from polyimides by phase inversion and are then crosslinked by addition of amine crosslinking agents that react with the imide groups of the polyimide, creating amide bonds. These stabilise the membranes and allow solvent nanofiltration to be maintained even in the solvents from which the membranes were formed by phase phase inversion.

L'invention concerne des membranes asymétriques à peau intégrale perfectionnées pour nanofiltration de solvant organique, ainsi que leurs procédés de fabrication et leur utilisation. Les membranes sont formées à partir de polyimides par inversion de phase et sont ensuite réticulées par addition d'agents de réticulation de type aminés qui réagissent avec les groupes imides du polyimide, créant des liaisons amides. Celles-ci stabilisent les membranes et permettent à une nanofiltration de solvant d'être maintenue même dans les solvants à partir desquels les membranes ont été formées par inversion de phase.

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