Effects of non-ideal adsorption equilibria of gas mixtures on column dynamics |
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Authors: | Jeong-Ho Yun Dae-Ki Choi Sung-Hyun Kim Hee Moon |
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Affiliation: | (1) Div. of Environment & CFC Technology, Korea Institute of Science & Technology, Cheongryang, P.O.Box 131, 130-650 Seoul, Korea;(2) Dept. of Chemical Engineering, Korea University, 136-701 Seoul, Korea;(3) Dept. of Chemical Technology, Chonnam National University, 500-757 Kwangju, Korea |
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Abstract: | A theoretical study has been made for simulating the dynamic behavior of non-ideal gas mixtures in an isothermal fixed-bed
adsorber. A mathematical model was developed which takes into account the non-ideality of adsorbable species on the adsorbed
phase under equilibrium. The model is based on both the real adsorbed solution theory (RAST), which incorporates the activity
coefficients in the multicomponent isotherm equations to account for the deviations from ideality, and the linear driving
force (LDF) model for representing diffusion resistance inside the adsorbent particles. To describe the effect of non-ideal
adsorption equilibrium of gas mixtures on the breakthrough curves, we considered several model mixtures of binary and ternary
components which exhibit non-ideal behavior with azeotropic crossovers in the composition domains at equilibrium. Sample calculations
of a fixed-bed adsorption were done with various inlet gas compositions of binary and ternary mixtures, respectively, at a
fixed total concentration. From the calculation results, it was shown that the order of breakthrough curves could be changed
at a certain value of inlet gas composition ratio. This result implies that the dynamic behaviors of fixed-bed adsorption
are greatly influenced by multicomponent equilibrium models. Furthermore, the reversal phenomenon of breakthrough curves could
not be simulated by the ideal adsorbed solution theory (IAST). |
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Keywords: | Fixed-bed Adsorption Dynamic Behavior Non-ideal Adsorption Equilibrium Multicomponent System Adsorbed Solution Theory |
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