为了探讨离子交换分离L-缬氨酸的传质动力学及动态穿透特征，讨论了不同类型树脂的分离效能，研究了传质动力学及控制步骤，分析了固定床动态传质行为。结果表明，苯乙烯型强酸阳离子交换树脂有较佳的分离效能，吸附容量是其他树脂的5~8倍、选择性α为1.3~1.8；中性(或弱酸性)时，L-缬氨酸呈两性离子形态，有利于离子交换吸附。苯乙烯型强酸阳离子交换树脂001×7吸附分离L-缬氨酸，符合准二级动力学模型，初期受颗粒内与液膜两扩散共同控制，中后期受多个因素影响。Thomas和Yoon-Nelson模型适合描述L-缬氨酸和L-亮氨酸的动态穿透行为；流速增加，平衡吸附容量qe、体积吸附量N0和操作时间τ递减；料液浓度增加，平衡吸附容量qe和体积吸附量N0增加，但操作时间τ减少；床层高度的影响与料液浓度的影响呈相反趋势，高径比宜在5以下。

The separation effects of different types of resins, the mass transfer kinetics and the rate-controlling step, the breakthrough behavior in a fixed bed were studied respectively in order to investigate the kinetics and the dynamic breakthrough characteristics for the L-valine separated by ion exchange. The results showed that the adsorption capacity of strong acidic cation exchanger resin, with a better separation effect, were five to eight times that of other resins, meanwhile their selectivity was from 1.3 to 1.8. L-valine with amphoteric ionic sates in a neutral (or slightly acidic) solution, was beneficial to its exchange adsorption. Moreover, the pseudo-second order kinetic model was found to describe adsorption process of the L-valine well with 001×7 resin as a separation media, such a process was affected by the particle and the liquid film diffusions together at early stage and then by multiple factors at medium-latter stage. Thomas and Yoon-Nelson models could describe breakthrough behaviors of the L-valine and the L-leucine well. The equilibrium adsorption capacity qe, volume adsorption capacity N0 and operation time τ decreased gradually with enhancing flow rate of the L-valine feed, whereas the equilibrium adsorption capacity qe and volume adsorption capacity N0 increased but operation time τ decreased gradually with increasing feed concentration of the L-valine. The ratio of height to diameter should be less than 5 and had an opposite trend to the effect of feed concentration change of the L-valine.