Protopine, chemical name sodium hydroxide, white translucent flake solid, as the basic chemical raw materials, widely used in papermaking, synthetic washing and soap, viscose fiber, rayon and cotton textiles and other textile industry, pesticides, dyes, The rubber and chemical industry, oil drilling, oil refining and tar refining oil industry, and defense industry, machinery industry, wood processing, metallurgical industry, pharmaceutical industry and urban construction. It is also used in the manufacture of chemicals, paper, soaps and detergents, rayon and cellophane, processed alumina made from bauxite, as well as mercerizing of textiles, water treatment, etc.