球形吸附剂间歇吸附的新近似模型  

NEW APPROXIMATE MODEL FOR BATCH ADSORPTION IN SPHERICAL ADSORBENT

作　　者：王永成[1] 查飞[1] 冯罕玉[1] 

机构地区：[1]西北师范大学化学化工学院,甘肃兰州730070

出　　处：《化工学报》2002年第2期216-219,共4页CIESC Journal

摘　　要：A new approximate concentration profile model for batch adsorption in a spherical adsorbent is proposed.The whole process of batch adsorption is divided into two stages.The first stage is that adsorption front moves from the surface of particle to its center.The second stage is a process in which adsorbate is accumulated in the intraparticle.Both concentration profiles of two stages are assumed to be cubic approximation of sphere radius.Compared with exact solution and other approximate models such as parabolic concentration profile and n -th concentration profile,the new model is closely matched with exact solution and is more accurate than n -th and parabolic models,especially during the initial adsorption period when Biot number is greater.This model can be used in the calculations of complex process of unsteady adsorption of spherical adsorbent.A new approximate concentration profile model for batch adsorption in a spherical adsorbent is proposed.The whole process of batch adsorption is divided into two stages.The first stage is that adsorption front moves from the surface of particle to its center.The second stage is a process in which adsorbate is accumulated in the intraparticle.Both concentration profiles of two stages are assumed to be cubic approximation of sphere radius.Compared with exact solution and other approximate models such as parabolic concentration profile and n -th concentration profile,the new model is closely matched with exact solution and is more accurate than n -th and parabolic models,especially during the initial adsorption period when Biot number is greater.This model can be used in the calculations of complex process of unsteady adsorption of spherical adsorbent.

关 键 词：吸附模型 间歇吸附 球形吸附剂 扩散方程 近似计算模型 

分 类 号：TQ028.15[化学工程] TQ021.4