Composite membranes comprising a sulfonated polyarylether and their use in forward osmosis processes

摘要

The present invention is directed to thin film composite membrane (TFC membrane) comprising a substrate layer (S) based on a sulfonated polymer, e.g. a sulfonated polyarylether, and a polyamide film layer (F) and further to a method for their preparation. Furthermore, the present invention is directed to osmosis processes, in particular to forward osmosis (FO) processes, using said membrane.

主权项

1. Composite membrane comprising:
a) at least one substrate layer (S) comprising
i) at least one sulfonated polymer P1, which comprises from 2 to 40 wt %, based on the total weight of the polymer P1, of recurring units comprising at least one sulfonic acid group;ii) at least one polymer P2, wherein the sulfonated polymer P1 and the polymer P2are independently selected from the group consisting of polyarylether, polyethersulfone, polyphenylensulfone, polysulfone, polyacrylonitrile, polybenzimidazole, polyetherimide polyphenyleneoxide, polyvinylidenfluoride, polyimide and copolymers composed of at least two recurring units of said polymers; wherein the weight ratio of sulfonated polymer P1 to polymer P2 is in the range of 0.4 to b) at least one film layer (F) comprising at least one polyamide.