The invention provides the synthesis process of an azo-disperse dyes monomeric compound, comprising the following steps: (1) diazotization of compound (II) and nitrosyl
sulfuric acid is completed with the temperature being controlled between 1 DEG C and 25 DEG C; (2) water, emulsifying agent and compound (III) are added into a
coupling reactor and stirring and pulping are completed at the temperature
ranging from 10 DEG C to 25 DEG C; (3) diazonium salt is evenly added into the
coupling reactor from below the
slurry and is stirred till the end of the reaction, and then extraction
filtration and washing are adopted till the
slurry shows neutrality; finally, the azo-disperse dyes monomeric compound can be obtained after
drying. Through improving preparation process, a great amount of ice or frozen
salt water no longer needs to be added for
cooling down during
coupling reaction to meet the requirements; the temperature of
coupling reaction is gradually raised to 20 DEG C to 45 DEG C by use of heat liberation of
coupling reaction and diazonium salt
dilution instead; thereby, under the condition of identical quality effect, cost is greatly reduced and at the same time,
energy consumption during preparing cooling agent such as ice and frozen
salt water is also substantially reduced.