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Electrodialytic process for producing an alkali solution

  • US 5,282,935 A
  • Filed: 04/13/1992
  • Issued: 02/01/1994
  • Est. Priority Date: 04/13/1992
  • Status: Expired due to Fees
First Claim
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1. An electrodialytic process for producing an alkali solution from a salt comprising the steps of:

  • a. separating at least one central ion exchange compartment from a first adjacent ion exchange compartment by a bipolar water ionizing electrode on the side of the central ion exchange compartment closer to a cathode and from a second adjacent ion exchange compartment by a first cation permselective membrane positioned on the side of said central ion exchange compartment closer to an anode;

    (b) separating a second adjacent ion exchange compartment and an anode compartment by a second cation permselective membrane;

    (c) separating a first adjacent ion exchange compartment and a cathode compartment by a third cation permselective membrane;

    (d) feeding a sodium carbonate solution to the first adjacent ion exchange compartment and the second adjacent ion exchange compartment;

    (e) feeding an anolyte solution into the anode compartment;

    (f) feeding a catholyte solution to the cathode compartment;

    (g) generating hydrogen ions in the anode compartment and transporting those hydrogen ions through said second cation permselective membrane to said second adjacent ion exchange compartment to produce carbon dioxide;

    (h) transporting sodium ions through the first cation permselective membrane from said second adjacent ion exchange compartment to the central ion exchange compartment;

    (i) reducing water in the central ion exchange compartment with the bipolar water ionizing electrode; and

    (j) combining the transported sodium ions with hydroxyl ions produced in the central ion exchange compartment to form sodium hydroxide.

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