| 摘要 |
PURPOSE:To enable to lower bath voltage, in electrolyzing an aqueous alkali chloride solution, by providing a predetermined finely roughened part on the surface of a fluorine-containing ion exchange membrane of a diaphragm so as to contact said roughened part with an electrode. CONSTITUTION:On the surface of a fluorine-containing cation exchange membrane 1 having a sulfonic acid group, a carboxylic acid group or a phosphoric acid group, a finely roughened part of which a depth or a height from the surface thereof is 0.01-50mu in average is formed in a density of 10<3>-10<5>/cm<2>. Next, the exchange membrane 1 having said finely roughened part is arranged in an electrolytic tank so as to contact with at least either of an anode 4 and a cathode 5. Subsequently, in this condition wherein electrodes 4, 5 and the exchange membrane 1 are contacted with each other, an aqueous alkali chloride solution is electrolyzed to produce alkali hydroxide chlorine. |
