C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/156, 204/65
C25B 1/46 (2006.01) C25B 9/00 (2006.01)
Patent
CA 2037522
SYSTEM FOR ELECTROLYTICALLY GENERATING STRONG SOLUTIONS OF HALOGEN OXYACIDS Abstract The present invention resides in a process and apparatus for the electrolytic production of strong solutions of halogen oxyacids, more specifically for the production of such acids having a normality of about 0.1 to about 3.6 from the corresponding alkali metal salts of such acids. The present invention comprises establishing a solution of the corresponding alkali metal salt having a molar concentration less than that at which precipitation of said salt occurs. An electrolytic cell is provided comprising an anode compartment containing an anode, a cathode compartment containing a cathode, and a middle feed compartment intermediate the anode compartment and cathode compartment. The feed compartment is separated from the anode compartment by a diaphragm or an anion- selective membrane, and from the cathode compartment by a cation-selective membrane. Means are provided for introducing said alkali metal Walt solution into said middle feed compartment and for applying a voltage between the anode and cathode. Under the influence of the applied voltage, the alkali metal ions migrate through the cation- selective membrane to the cathode, reacting with hydroxyl ions to form alkali metal hydroxide, and the oxyhalogen ions migrate through the diaphragm or anion-selective membrane to the anode reacting with protons to form halogen oxyacid. Means are provided for maintaining the cell at a temperature in the range of about 10°C to about 40°C.
Coin Richard J.
Elliott Joseph E.
Rudd Eric J.
Sacco Anthony R.
Eltech Systems Corporation
Gowling Lafleur Henderson Llp
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