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A.2. Mass balance The column material balance is represented by the axial dispersed plug flow model: Axial dispersion is found using a model developed by Wakao and Funazkri1: ) where Dm is the molecular diffusivity, u is the interstitial velocity, dp is the particle diameter, and γ1 and γ2 are constants typically assumed to be 0.7 and 0.5 respectively.2 The adsorption rate was described with a linear driving force (LDF) model described as:2 LDF coefficients were found from performing breakthrough experiments on the same material in a separate breakthrough apparatus. A.3. Equilibrium model Adsorption equilibrium was formulated by the dual-site Langmuir (DSL) model.3 The pure component amount adsorbed, ni*, was represented by equation A4 where the equilibrium constants show an Arrhenius relationship to temperature involving adsorption energy and entropy, as expressed by: 154PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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