Membranes and methods useful for caustic applications
First Claim
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1. A method comprising contacting a membrane comprising a polysulfonamide matrix with a feed solution having a pH of at least about 11 , so that the feed solution is fractionated into a permeate and into a retentate, wherein the polysulfonamide matrix comprises, 1) an insoluble branched condensation polymer matrix comprising reactant residues, and 2) a plurality of aryl residues that differ from said reactant residues and that are terminally-linked to the insoluble branched condensation polymer matrix through sulfonamide bonds.
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Abstract
The invention provides methods for purifying caustic feed streams using membranes that comprise polysulfonamide matrices.
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24 Claims
- 1. A method comprising contacting a membrane comprising a polysulfonamide matrix with a feed solution having a pH of at least about 11 , so that the feed solution is fractionated into a permeate and into a retentate, wherein the polysulfonamide matrix comprises, 1) an insoluble branched condensation polymer matrix comprising reactant residues, and 2) a plurality of aryl residues that differ from said reactant residues and that are terminally-linked to the insoluble branched condensation polymer matrix through sulfonamide bonds.
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