Method for producing vat yellow 3RT

A method for producing vat yellow 3RT includes the preparation steps: uniformly mixing 1,5- dichloroanthraquinone, 1-amino-anthraquinone, sodium carbonate and copper catalysts, heating up mixture to reach 120-130 DEG C, dewatering the mixture, continuously heating up the mixture to reach 210-260 DEG C, keeping the temperature, reducing the temperature to be lower than 60 DEG C and discharging the mixture to obtain crude imine; adding the obtained crude imine into water, boiling the water, reducing the temperature to reach room temperature, filtering the crude imine, washing the crude imine to be neutral and drying the crude imine to obtain refined imine; taking pyridine, stirring and heating up the pyridine and adding aluminum trichloride into the pyridine at the temperature of 70-115 DEG C; adjusting the temperature to range from 80 DEG C to 115 DEG C, adding the refined imine into the pyridine, heating up to 140-160 DEG C and keeping the temperature for 1-5 hours; recycling the pyridine by means of distillation after keeping the temperature; filtering the pyridine and washing the pyridine to be neutral to obtain vat yellow 3RT crude dye; taking water, adding the vat yellow 3RT crude dye into the water and adding potassium permanganate and sodium hypochlorite after beating; and heating up the vat yellow 3RT crude dye to 90-95 DEG C, filtering the vat yellow 3RT crude dye and washing the vat yellow 3RT crude dye to be neutral to obtain the vat yellow 3RT.