| 摘要 |
PURPOSE:To prevent damage of an anion exchange membrane in electrolyzing by using said membrane by shortening a distance between electrodes by utilizing a repelling force of a spring provided to an anode as well as by applying a specific positive pressure to a cathode chamber. CONSTITUTION:In a finger type electrolytic tank, an alkali metal chloride is electrolyzed by utilizing an anion exchange membrane. In this case, for example, an expansible anode is formed from a spring electrode and, by utilizing a repelling force of a spring, an anode is pressed to a cathode side to adjust a distance between electrodes to 0-50mm. (especially, 0-3mm.). Press pressure of the spring is pref. adjusted to 0.01-10kg/cm<2>. On the other hand, a possitive pressure of 0.01-10kg/cm<2> is applied to a cathode chamber by adjusting a height of an anode liquid, a height of a cathode liquid, a negative gas pressure of the anode and a gas pressure of the cathode. When electrolysis is carried out in this condition, cell voltage is extremely lowered and the membrane is not damaged. |
