The invention discloses a synthesis process of a dimido dipheny compound. The synthesis process disclosed by the invention comprises the following steps: by taking
benzene(I) as a
raw material, carrying out continuous
nitration on a micro reactor platform to obtain a mixed
nitrobenzene compound (II); then obtaining a mixed diaminobenzene compound (III) by carrying out
catalytic hydrogenation reduction under a mild condition with temperature of 50~70 DEG C and
hydrogen gas pressure not higher than 1.0MPa; and purifying to obtain o-phenylenediamine, p-phenylenediamine and m-phenylenediamine. The synthesis process disclosed by the invention has the benefits that: the use level of
nitric acid is low, so that the waste acid is easy to concentrate and apply mechanically; the heat release is less, the product
dinitrobenzene compound (II) is quickly transferred, the reaction phenomenon is stable without intense heat release and even punch of a common
autoclave nitration reaction, so that the safety of
nitration reaction is improved; the rate in
nitrification reaction is fast, and the
energy consumption is reduced; the reaction phenomenon is stable, so that the safety of
catalytic hydrogenation reduction reaction is improved; the synthesis process is a new technique which is high in safety, easy to industrialize and less in environment protection.