Electrodialytic process for producing an alkali solution
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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Abstract
A bipolar water ionizing electrode and a process employing such an electrode in an electrodialytic cell are disclosed. The cell has a plurality of ion exchange compartments separated by cation permselective membranes and the bipolar water ionizing electrode. The bipolar electrode is permeable to gas and electric current and impervious to liquid.
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Citations
7 Claims
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1. An electrodialytic process for producing an alkali solution from a salt comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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