A non-equilibrium model for fixed-bed multi-component adiabatic adsorption |
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| Authors: | Jeff H. Harwell Athanasios I. Liapis R. Litchfield Daniel T. Hanson |
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| Affiliation: | Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, U.S.A.;Department of Chemical Engineering, University of Missouri-Rolla, Rolla, MO 65401, U.S.A.;Department of Chemical Engineering, University of Surrey, Guildford, England;Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, U.S.A. |
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| Abstract: | A mathematical model for adiabatic adsorption of multiple components onto a fixed bed of adsorbent is developed. The model consists of a set of coupled, hyperbolic, parial-differential equations. Heat and mass transfer resistances evident in real systems are included in the model. Solutions of the equations are obtained by numerical application of the method of characteristics. Results show non-ideal mass and thermal wavefronts and complex wave-wave interactions in adiabatic adsorption of benzene and cyclohexane onto activated carbon. Phenomena of inversions in relative adsorptivity due to temperature changes are also shown. Column performance is indicated to be greatly affected by these phenomena. Cases considered demonstrate that time on stream before breakthrough may be doubled by increasing influent and initial bed temperatures. It is shown, in contrast to results obtained fron using the non-equilibrium model, that models based on assumptions of local equilibrium cannot quantitatively describe behavior of a typical industrial adsorption system. |
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| Keywords: | Author to whom correspondence should be addressed. |
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