Abstract: The mechanism of diffusion of a citric acid aqueous solution upon a sorption resin granule depends upon it structure and dimension of pore and distribution surface energy on sorption granule surface. Especially under the condition of high concentration liquid phase, diffusion in the solid phase usually proceeds as a diffusion controlled zone. Glueckauf and Hill suggested respectively linear driving force (LDF) model and modified linear driving force (MLDF) model. When ratio of liquid and solid phases is rather high and phase equilibrium model is nonlinear, we obtain analytical solution and plots of these models for the sorption and desorption steps.

摘要： 柠檬酸水溶液在吸附树脂颗粒中的扩散机理与吸附树脂颗粒表面结构、微孔大小和表面能分布有关,特别是当液相浓度较高时,传质受固相内的扩散速率控制.本文采用Glueckauf和Hill建议的线性推动力近似模型和修正线性推动力近似模型,在液相浓度较高、相平衡关系呈非线性时,得到吸附和解吸阶段模型的解析解和曲线图.