ELECTROLYTIC CELL FOR MANUFACTURING CHLORINE AND SODIUM HYDROXIDE AND METHOD FOR MANUFACTURING CHLORINE AND SODIUM HYDROXIDE

摘要

In the disclosed method for manufacturing chlorine and sodium hydroxide, calcium precipitation inside an ion-exchange membrane in a two-chamber electrolytic cell provided with gas diffusion electrodes is prevented, allowing stable and economic operation. A liquid retention layer (3) that can retain 0.10-0.80 grams of H2O per cubic centimeter is provided between the ion-exchange membrane (12) and a gas diffusion electrode (16). This makes it easier for calcium ions that have moved through the ion-exchange membrane to diffuse, minimizing increases in electrolytic voltage and decreases in current efficiency due to precipitation of calcium ions inside the ion-exchange membrane.