Study on hydrolysis and alcoholysis kinetics of Reactive Brill Yellow K-6G

The aim of this study was to gain some insight into the kinetics of reactive dye when uptaking on the fiber.The methanolysis and hydrolysis of monochlorotriazine C.I.Reactive Yellow 2 in basic methanol water solution under different conditions were studied,and the rate constants of these reactions,when pH=10,were also determined.It was found that when the temperature at(80 ℃) and pH=9-12,the methanolysis efficiency decreased as the time increased,and higher the pH value,faster decreased the methanolysis.Increasing pH value was disadvantageous to alcoholysis,i.e.,the superiority of alcoholysis reaction of dye lowered and,when pH=10,the methanolysis reaction rate contants were 2-3 times of that of hydrolysis reaction under 50-(70 ℃),but were almost equal to that of hydrolysis reaction when the temperature was 80-(95 ℃).It was also found that both the methanolysis and hydrolysis reactions were pseudo-first-order reactions.