PORE- AND SOLID-DIFFUSION KINETICS IN FIXED-BED ADSORPTION UNDER CONSTANT-PATTERN CONDITIONS
PORE- AND SOLID-DIFFUSION KINETICS IN FIXED-BED ADSORPTION UNDER CONSTANT-PATTERN CONDITIONS
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DOI：
10.1021/i160018a011
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发表时间：
1966-01-01
期刊：
影响因子：
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通讯作者：
VERMEULEN, T
中科院分区：
文献类型：
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作者：
HALL, KR;EAGLETON, LC;VERMEULEN, T
在可平衡吸附区域，等温穿透曲线的恒定模式形式仅近似地为固体扩散（或孔表面扩散）机制所知，并且对于孔扩散机制在解析上是不可解的。本文对这两种情况的数值解，在电子计算机上用逐步计算的方法，以广泛适用的无量纲形式，对一系列的朗缪尔等温线进行了计算。这些数值计算结果与完全不可逆平衡时的解析解相融合;在这种情况下，还分析了孔扩散和外部传质的组合。固定床吸附器和离子交换器的OLUMN性能研究特别涉及柱流出物的浓度历史或“穿透曲线”，即流出物浓度随时间或流出物体积的变化。Bohart和亚当斯（3）和Wicke（22）首先发现了恒定模式集中的存在
In the favorable-equilibrium adsorption region, the constant-pattern form of the isothermal breakthrough curves is known only approximately for the solid-diffusion (or pore-surface-diffusion) mechanism, and is not soluble analytically for the pore-diffusion mechanism. Numerical solutions for both these cases, in a widely applicable dimensionless form, have been obtained for a range of Langmuir isotherms by stepwise com-putation on a digital computer. These numerical results merge smoothly into the respective analytic solu-tions for completely irreversible equilibrium; for this case, combinations of pore diffusion and external mass transfer are also analyzed.^^ OLUMN-performance studies for fixed-bed adsorbers and ion exchangers involve particularly the concentration history or “breakthrough curve” ofthe column effluent—that is, the variation in effluent concentration with respect to time or volume of effluent. Bohart and Adams (3) and Wicke (22) first identified the existence of constant-pattern concentration