Semi-permeable membranes prepared via reaction of cationic groups with nucleophilic groups
First Claim
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1. Method of improving the selectivity of a semi-permeable membrane comprising:
- (a) contacting the membrane with a first reactive, ionic compound in an aqueous diluent while maintaining chemical potential gradient so as to deposit the ionic compound on membrane surface; and
(b) maintaining chemical potential gradient while contacting the membrane in an aqueous diluent with a second reactive, ionic compound of a charge opposite to the first compound, so as to form a coacervate.
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Abstract
A novel composite membrane and methods of making the membrane are described. The discriminating layer of the membrane is prepared by reaction of a reactive cationic compound group with a compound bearing a nucleophilic moiety. At least one of the reactants bears an average of two or more reactive groups. The reaction product contains covalent bonds formed via charge eliminating reactions.
In a preferred embodiment of the invention, the nucleophilic group is anionic and a coacervate is formed initially on a microporous substrate. The resulting membrane may be useful for reverse osmosis, gas or ultrafiltration separations.
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Citations
26 Claims
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1. Method of improving the selectivity of a semi-permeable membrane comprising:
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(a) contacting the membrane with a first reactive, ionic compound in an aqueous diluent while maintaining chemical potential gradient so as to deposit the ionic compound on membrane surface; and (b) maintaining chemical potential gradient while contacting the membrane in an aqueous diluent with a second reactive, ionic compound of a charge opposite to the first compound, so as to form a coacervate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification