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Membranes and methods useful for caustic applications

  • US 7,575,687 B2
  • Filed: 07/28/2006
  • Issued: 08/18/2009
  • Est. Priority Date: 08/16/2005
  • Status: Active Grant
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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