C.I.活性蓝19的消除反应动力学研究

Study on elimination kinetics of C. I. Reactive Blue 19

为更好地了解乙烯砜型活性染料在近中性条件下的稳定性,采用高效液相色谱法(HPLC)研究了乙烯砜型活性染料C.I.活性蓝19的消除反应动力学。实验结果表明,C.I.活性蓝19的消除反应为二级反应,在缓冲溶液中可看成拟一级反应,其拟一级反应速率常数K=kc(OH-)。一定温度下,由于原盐效应,二级反应速率常数k随着缓冲溶液离子强度的增大而增大;在无限稀释的条件下,k仅与温度有关,k=8.86×1011 exp(-6 604/T),反应活化能约为54.91 kJ/mol。

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 × 10^11 exp（-6 604 /T） in the infinitely dilute conditions.The reaction activation energy is 54.91 kJ /mol approximately.