Abstract: A physic-mathematical model is presented for multiphase diffusion mass-transfer in shell-core type ion exchanger. Both liquid film diffusion and inner-particle diffusion, which control the mass-transfer rate, are unsteady-state processes in quasihomogeneous phase. An equation of exchange fraction is. systematically derived. The basic laws of kinetics offer a theoretical basis for selecting optimization parameters. This equation can also be used to determine inner-particle diffusion coefficient and liquid film thickness.

摘要： 本文提出了壳-核型离子交换剂复相扩散传质的物理数学模型.联合控制着传质速率的液膜扩散及粒内扩散是准均相内的非定态过程.系统地导出了交换度方程.动力学基本规律为选择最优化参数提供了理论依据,并可同时测算内扩散系数和液膜厚度.