Abstract
The effect of a non-constant intraparticle total pressure for one-component ad- and desorption kinetics on single adsorbent pellets is investigated. Intraparticle pore mass transport is quantified by using the Dusty Gas model accounting for Knudsen diffusion, Fickian diffusion and viscous flow. Sorbed phase diffusion may also be included. Adsorption equilibrium between pore fluid and adsorbed phase is assumed. From the computations intraparticle total pressure, temperature and concentration profiles are obtained. It is found that intraparticle total pressure change may be as high as 1% of the ambient total pressure depending on process conditions as well as material properties. Although this results in a viscous flow contribution to total pore mass transport of up to 15% at certain positions within the particle, the effect seems negligible for most cases of practical relevance as far as purification tasks are considered. For separation purposes further studies are needed.
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