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US 2012/0223014 A1Published application
Polymide membrane
AssigneeEvonik Membrane Extraction Technology Ltd.
InventorsAndrew Timothy Boam, Andreja Manuela Martins Miranda, Andrew Guy Livingston
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Abstract
A high mass transfer membrane for use in membrane phase contactors to extract a solute from an aqueous phase to a solvent phase and their method of preparation and use are disclosed. The membrane is formed from polyimide by phase inversion and may optionally be crosslinked to maintain stability even in the solvents from which the membranes were formed by phase phase inversion.
Claims21
An asymmetric polyimide membrane comprising:
- (i) a porous supporting substrate, and (ii) a polyimide having a repeating unit of the formula (I):
- wherein:
- each R1, R2, R3, R4, R5, R6, R7, R8 and R11 is independently selected from the group comprising:
- H, C1-3 alkyl, C1-3haloalkyl and halo;
- X is selected from the group comprising:
- a bond and
- and Y is absent;
- or X and Y are each independently selected from the group comprising:
- a bond and
- or X and Y are each absent so as to form a fused aromatic structure of formula (II):
- each R9, when present, is independently selected from the group comprising:
- C1-3 alkyl, C1-3 haloalkyl and halo;
- each R10, when present, is independently selected from the group comprising:
- C1-3 alkyl, C1-3 haloalkyl and halo;
- Z is selected from the group comprising:
- a bond and CR12—;
- p is 0-4;
- and
- q is 0-3.
16 more elements
(canceled)
Dependencies are inferred from the claim text.