Used in the manufacture of dyes, etc., can also be used to prevent rust of wheat pesticides, said acid rust (not the current basic); it is an important intermediate for the production of acid orange II, acidic medium brown-yellow 4G, acidic Medium deep yellow GG, direct Huang GR, reactive red K-2G and K-3R activity purple, and so on; can be used in the manufacture of auxiliaries (paper, printing and dyeing), such as dissolved salt B, fluorescent whitening agent BG, BBU, H, such as salt dust, or other spices, food coloring (the use of large, mainly used in lemon yellow, sunset yellow on the production), medicine, building materials (mainly for water-reducing agent system), and other sectors of the ideal raw material intermediates