| 摘要 |
PROBLEM TO BE SOLVED: To improve the electrolysis efficiency in electrolysis by making the intermediate chamber liquid of a three-chamber electrolysis cell alkaline. SOLUTION: The three-chamber electrolysis cell is formed by using an anion exchange membrane as the diaphragm between an anode chamber and an intermediate chamber and using a cation exchange membrane as the diaphragm between the cathode chamber and the intermediate chamber. An aq. salt soln. is made to exist in the intermediate chamber, an aq. acid soln. in the anode chamber and an aq. alkaline soln. in the cathode chamber. The electrolysis is effected by energizing the cathode from the anode to form the acid in the anode chamber and to form an alkali in the cathode chamber. The hydrogen ion transport number of the cation exchange membrane is dominant in the current efficiency of the three-chamber method electrolysis process but, if the liquid of the intermediate chamber is made alkaline, the hydrogen ion transport number of the anion exchange membrane degrades and the current efficiency of the process increases. Simultaneously, the transport number of the hydrogen ions of the cation exchange membrane increases as well. As a result, the pH value of the intermediate chamber is kept at a balance value or above and the electrolysis is effected while the respective chamber liquids are continuously supplied. |
