ELECTROLYTIC CELL FOR SODIUM CHLORIDE AND ELECTROLYZING METHOD FOR THE SAME

PURPOSE:To broaden the fluctuation range of current density and brine concentration of an anode side by specifying the ratio of volume in the upper part of the electrolytic face of an anode chamber or the anode chamber and a cathode chamber in the electrolyzer of sodium chloride and effective electrolytic area and holding a liquid-gas mixed layer to at least the electrolytic face. CONSTITUTION:The ratio V/S of volume V in the upper part of the electrolytic face of an anode chamber 1 or the anode chamber 1 and a cathode chamber 2 in the electrolyzer of sodium chloride and effective electrolytic area S is regulated to >=0.1 (decimeter). In electrolysis of sodium chloride wherein this electrolyzer is used, a liquid-gas mixed layer 14 is maintained to at least the electrolytic face. By the above-mentioned method, even when the electrolyzer is operated at 8-20kA/m electrolytic current density, stable electrolytic voltage having the range of electrolytic voltage of + or -20mV is shown similarly to a time of 2-4kA/m current density.