| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of caustic soda that is not affected with demand and supply of caustic soda and chlorine because there is not byproduct of chlorine.SOLUTION: In a method in which a sodium salt aqueous solution is subjected to electrolysis by an ion exchange membrane method to produce caustic soda, a hydrogen gas diffusion electrode is used in a positive electrode, caustic soda is generated in a negative electrode chamber, an acid is generated in a positive electrode chamber, the acid is reacted with soda ash and/or sodium bicarbonate to generate a sodium salt to be used in electrolysis. |
