弱碱性阴离子交换树脂的再生动力学

ION EXCHANGE KINETICS OF REGENERATION FOR WEAK BASIC ANION EXCHANGER

弱碱性阴离子树脂的优点是容易再生,但至今未见其再生动力学研究的报道。Hll通过光学方法观测到再生时树脂相内的动边界。从而肯定了用NaOH再生盐式弱碱性阴离子树脂是遵守层进机理的。以前的研究工作肯定了可以根据溶液中反离子浓度的变化来确定离子交换树脂的转换度,得到了适用于有限浴及离子交换剂颗粒半径保持恒定或不断随交换反应进行而变化条件下的速度表达式。适用于不同条件的由已反应层内的扩散控制的层进机理的离子交换反应的速度方程分别为: 1.无限浴及交换剂颗粒半径恒定条件下E(t)=1-3(1-X)^(2/3)+2(1-X)=6λD_eC_B^0t/(?) (1) 2.

The results of kinetic studies of regeneration for weak basic anion exchanger in NO_3^-, Cl^- and SO_4^(2-) forms are presented. A mathematical model of shell-progressive mechanism with changing bulk solution concentration and exchanger volume in ion exchange has been used to interpret the regeneration process,and the effective diffusion coefficients have been obtained.