Asymmetric membranes for use in nanofiltration
AssigneeIP2Ipo Innovations Limited
InventorsAndrew Guy Livingston, Yogesh Suresh Bhole
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Abstract
Improved integrally skinned asymmetric membranes for organic solvent nanofiltration, and their methods of preparation and use are disclosed. Membranes are formed from polybenzimidazoles by phase inversion and are then crosslinked by addition of crosslinking agents. These stabilize the membranes and allow solvent nanofiltration to be maintained even in the solvents from which the membranes were formed by phase inversion, and in strongly acidic and strongly basic solvents.
Claims17
A membrane suitable for nanofiltration of a feed stream solution comprising N,N-dimethylformamide and dissolved solutes and having a molecular weight cut off of 200-2000 g/mol at ambient temperature, comprising an integrally skinned asymmetric crosslinked polybenzimidazole cast film membrane, wherein the membrane is impregnated with a conditioning agent, and wherein the conditioning agent maintains the pore structure of the membrane prior to its use for nanofiltration.
Dependencies are inferred from the claim text.