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Dialysis system

  • US 4,094,775 A
  • Filed: 02/28/1977
  • Issued: 06/13/1978
  • Est. Priority Date: 02/28/1977
  • Status: Expired due to Term
First Claim
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1. A system for selectively removing urea from an aqueous liquid containing urea and positive metal cations comprising in combination:

  • a container divided into a first chamber and a second chamber by means of a continuous sheet of cationically charged polymeric membrane selectively permeable to urea and having low permeability to cations;

    said first chamber including means for receiving said liquid; and

    said second chamber receiving a solution containing a urea decomposition agent whereby said cations are repelled by said membrane and retained in said liquid and urea permeates through the membrane into the solution and is decomposed into bicarbonate and ammonium, the ammonium being retained in the solution in the second chamber.

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