A kind of clean preparation method of disperse dyes

The invention discloses the clean preparation method of a kind of disperse dyes, utilize magnesium hydroxide to regulate the pH value of reaction system during disperse dyes synthesis, rich in magnesium ion and sulfate ion in the filter cake mother liquid coming obtained, this mother liquid coming is by adding liquefied ammonia regulation pH value, obtain magnesium hydroxide and ammonium sulfate, the magnesium hydroxide obtained can continue on for the synthesis of disperse dyes, ammonium sulfate carries out post processing again, obtain ammonia sulfate crystal, crystalline mother solution water and distilled water, crystalline mother solution water is back to post processing, and distilled water is back to the synthesis of disperse dyes.The present invention can reduce the consumption of supplementary material, can reduce again the discharge of sludge and waste water, it is achieved energy-saving and emission-reduction, truly accomplish cleaning produce.