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. The diffusion mechanism of aqueous solution of citric acid in the absorbent resin particles is related to the surface structure, pore size and surface energy distribution of the adsorbent resin particles, especially when the liquid phase concentration is high, the mass transfer is controlled by the diffusion rate in the solid phase.In this paper, Glueckauf and Hill suggested a linear approximation model and a modified linear approximation model. The analytic solutions and curves of the adsorption and desorption phase models were obtained when the liquid phase concentration was high and the phase equilibrium was nonlinear.