In chemical experiments, in addition to being used as a reagent, it can also be used as an alkaline desiccant because of its strong moisture absorption. Caustic soda is widely used in the national economy, and many industrial sectors need it. The most commonly used sector is chemical manufacturing, followed by paper, aluminum, tungsten, rayon, rayon and soap manufacturing. In addition, in the production of dyes, plastics, reagents and organic intermediates, the regeneration of old rubber, the electrolysis of metal sodium and water, and the production of inorganic salts, a large number of caustic soda is also used to produce borax, chromium salt, manganate, phosphate, etc.