Kinetics of hydrolysis of monofunctional and bifunctional monochloro-s-triazine reactive dyes

Abstract The kinetics of hydrolysis of one monochloro- s -triazine and one bis(monochloro- s -triazine) reactive dye were investigated at dyeing conditions of pH 11 and temperature 80°C, and, for the monofunctional dye, also at the lower temperature of 20°C. The alkaline hydrolysis was monitored by high perfomance liquid chromatography. The pseudo-first-order rate constants of the monochloro- s -triazine dye, the bis(monochloro- s -triazzine) form and the monochloromonohydroxybis- s -triazine form of the bifunctional dye were determined and compared.