Caustic soda generally refers to sodium hydroxide, sodium hydroxide, inorganic compounds , chemical formula NaOH, also known as caustic soda, caustic soda, solid soda, caustic soda, and caustic soda. Sodium hydroxide is highly alkaline and highly corrosive. It can be used as an acid neutralizer, coordinating masking agent, precipitating agent, precipitation masking agent, developer, saponifier, peeling agent, detergent, etc., and has a wide range of uses. There are two methods for industrial production of sodium hydroxide: causticization and electrolysis . The causticizing method is divided into soda ash causticizing method and trona causticizing method according to different raw materials; electrolytic method can be divided into diaphragm electrolysis method and ion exchange membrane method.