Process for preparing dinitroazo- (or azoxy-)benzene
申请人:Teijin Limited
公开号:US04158002A1
公开(公告)日:1979-06-12
A process for preparing a compound of the formula ##STR1## wherein m represents zero or 1, which comprises reacting azobenzene with nitric acid in the presence of sulfuric acid in two steps, wherein (1) the first-step reaction is carried out under the following conditions 0<x.ltoreq.80, 0<y.ltoreq.11, and -0.3x+12.ltoreq.y.ltoreq.-0.22x+22 wherein x is the reaction temperature in .degree.C., and y is the weight ratio of sulfuric acid to water and fed into the reaction system, and (2) the second-step reaction is carried out under the following conditions 0.ltoreq.x, and -(1.7/100)x+1.7.ltoreq.y.ltoreq.-(3.9/88)x+3.9.