The influence of temperature on the kinetics of concurrent hydrolysis and methanolysis reactions of a monochlorotriazine reactive dye

The competitive methanolysis and alkaline hydrolysis reactions of a monochlorotriazine reactive dye were studied at 50¯80°C, and the rate constants for these reactions were determined. It was found that each 10°C temperature increase led to more than a two-fold increase in the overall reactivity of the dye. In the temperature range employed, the rate constant for the methanolysis process was 6¯13 times higher than the rate constant for hydrolysis. Further, the preference for the methanolysis reaction decreased with increasing temperature. For each 10°C temperature rise, the rate constant for hydrolysis increased approximately three-fold and the rate constant for methanolysis increased more than two-fold. Rate constants for both reactions were found to be pseudo-first-order.