Electrolyzer for producing chlorine and sodium hydroxide and method for producing chlorine and sodium hydroxide

摘要

There is provided a method of production of chlorine · sodium hydroxide capable of being operated stably and economically by preventing calcium from being deposited in an ion exchange membrane. The liquid retention layer 3 having a liquid retention amount per unit volume of the liquid retention layer of 0.10g-H 2 O/cm 3 or more and 0.80g-H 2 O/cm 3 or less is put between the ion exchange membrane 12 and the gas diffusion electrode 16. Calcium ions transferred through the ion exchange membrane 12 easily diffuse, thereby making it possible to suppress increase in an electrolytic voltage and drop in current efficiency generated by deposition of the calcium ions inside the ion exchange membrane 12.