The pharmaceutical industry for the production and purification of sulfamethazine Analginum, chloroform, phenprofone and benzaldehyde. The rubber industry as a coagulant. The printing and dyeing industry is used as the dechlorination agent for cotton fabric after bleaching and the auxiliary agent for cooking of cotton fabric. Leather industry for leather treatment, leather can be soft, plump, tough, waterproof, bending, wear-resistant and other properties. The chemical industry for the production of sodium hydrosulfite, vanillin, hydroxylamine hydrochloride. The photographic industry as a developer.