超声场条件下两种扩散系数估算模型的比较

进行了常规条件和超声场条件下苯酚在NAKII树脂上的吸附相平衡实验和吸附动力学实验，结合吸附相平衡和吸附动力学，提出了一种估算超声场强度下NKAII树脂吸附苯酚的液固扩散系数的计算模型-相平衡-动力学模型（PEKM），分别采用PEKM模型和典型的球形颗粒大孔扩散模型估算了常规条件和超声场条件下的扩散系数，前者估算值大于后者2～3个数量级，使用估算出的扩散系数，借助于数学软件Matlab求解实际脱附过程的浓度与时间的关系，结果表明，使用PEKM模型比典型模型计算出的浓度更接近于实验结果，从而进一步证实了PEKM模型的合理性与可靠性，实验结果还表明，超声场条件下的扩散系数比常规条件下要大，而且随超声波强度的增大而增大。

Comparison Between Two Estimation Models of Diffusion Coefficient in Ultrasound Field

Adsorption phase equilibrium experiments and kinetic experiments of phenol on NKAII resin in the absence and presence of ultrasound were carried out in this paper.A new model,namely,Phase Equilibrium-Kinetics Model (PEKM) was proposed to estimate diffusion coefficient for adsorbate in an adsorbent particle.The coefficients calculated by PEKM were two to three orders of magnitude higher than those by the classic model.With the help of mathematic software Matlab,the use of the diffusion coefficients estimated by PEKM and the classic model simulates the variation of mass concentration of phenol vs.time in the absence and presence of ultrasound.Results showed that the mass concentrations calculated by PEKM were closer to the experimental data than those by the classic model.It further verified that PEKM was reliable and accurate.The results also showed that the diffusion coefficients under ultrasound were greater than those under non-ultrasound,and the diffusion coefficients increased with the ultrasound intensity.