REACTIVE BLACK 8 AND SALTING-OUT CRYSTALLIZATION METHOD FOR PRODUCING THE SAME

摘要

PURPOSE: A salting-out crystallization method is provided to reduce production cost and energy for reactive black 8 and to maximize the production yield of reactive black 8. CONSTITUTION: A salting-out crystallization method for producing reactive black 8 comprises the steps of: bonding trichlorotriazine and chromophore of the chemical formula 1 to prepare a colorant intermediate; adding NH4OH to a pigment intermediate to prepare a dye synthetic fluid in which reactive black 8 is included in 20~25 weight%; adding salt of 10~15 weight% to the dye synthetic fluid to prepare a mixed solution; and filtering reactive black 8 extracted in the mixed solution.