Abstract:

To investigate the stability of vinylsulfone reactive dyes under near neutral conditions, the elimination kinetics of C.I. Reactive Blue 19 was studied using high performance liquid chromatography(HPLC), and the results showed that the elimination reaction of C.I. Reactive Blue 19 is a second order reaction that can be seen as a pseudo first order reaction in buffer solution. The pseudo first rate constant K can be expressed as kc（OH-）, in which k , the second rate constant, increases with the increase of ionic strength of buffer solution because of salt effect under a certain temperature. The value of k, only related to temperature, can be expressed as k=8.86×1011exp（-6604/T）in the infinitely dilute conditions. The reaction activation energy is 54.91 kJ/mol approximately.