| 摘要 |
PROBLEM TO BE SOLVED: To smooth the supply of gas to a cathode surface and to enable the production of sodium hydroxide, hydrogen peroxide, etc., under a low electrolytic voltage by disposing a hydrophilic liquid permeable material between an ion exchange membrane and a gas diffusion cathode. SOLUTION: The sodium hydroxide is formed on the cathode chamber 14 side surface of the ion exchange membrane 12 when a current is supplied while a satd. brine is supplied to an anode chamber 13 and oxygen-contg. gas to a cathode chamber 14. At this time, the hydrophilic material 16 exists between the ion exchange membrane 12 and the gaseous oxygen diffusion cathode 17 and, therefore, the aq. sodium hydroxide soln. is diffused in the hydrophilic material 16 having the resistance lower than the resistance under which the aq. soln. passes the inside of the cathode 17. This aq. soln. is lowered particularly by gravity until the aq. soln. arrives at the bottom end of the hydrophilic material 16 and is stored in the bottom of the cathode chamber 14. Then, the taking of the formed aq. soln. out of the reaction site is executed by the dispersion in the hydrophilic material of the relatively small resistance and since the stagnation thereof in the cathode is substantially prevented, the supply problem of the reactive gases is solved and the reaction efficiency is highly maintained. |
