Sonetaka Noriyoshi, Fan Huan-Jung, Kobayashi Seiji, Chang Hui-Ning, Furuya Eiji
Network Service Division, NEC Corporation, Tokyo, Japan.
J Hazard Mater. 2009 May 30;164(2-3):1447-51. doi: 10.1016/j.jhazmat.2008.09.059. Epub 2008 Sep 25.
In general, the rate of adsorption involves both rates of liquid film mass transfer and intraparticle diffusion. Many researchers tried to minimize the effect of liquid film resistance when determining the effective intraparticle diffusivity. However, in some cases (for example, small adsorbent particle size), the liquid film resistance may not be easily eliminated in a fixed bed process. Therefore, this research proposed using the shallow bed technique to determine both intraparticle diffusivity (D(S)) and liquid film mass transfer coefficient (k(F)) simultaneously from a single-component adsorption uptake curve (AUC). The task was accomplished by the determination of the Biot number (Bi) from experimental adsorption uptake curve (EAUC). The Bi represents the ratio of the rate of transport across the liquid film to the rate of intraparticle mass transfer. The detailed calculation method is addressed in this paper. The method proposed in this research can be applied in the range of Bi between 0.5 and 200 where both liquid film resistance and intraparticle diffusion are significant.
一般来说，吸附速率涉及液膜传质速率和颗粒内扩散速率。许多研究人员在确定有效颗粒内扩散系数时试图尽量减少液膜阻力的影响。然而，在某些情况下（例如，吸附剂粒径较小），在固定床过程中液膜阻力可能不易消除。因此，本研究提出使用浅床技术从单组分吸附摄取曲线（AUC）同时测定颗粒内扩散系数（D(S)）和液膜传质系数（k(F)）。该任务通过从实验吸附摄取曲线（EAUC）确定毕渥数（Bi）来完成。Bi表示穿过液膜的传输速率与颗粒内传质速率之比。本文阐述了详细的计算方法。本研究提出的方法可应用于Bi在0.5至200范围内，此时液膜阻力和颗粒内扩散都很显著。
