A mathematical model for multicomponent adsorption, desorption and displacement kinetics of ethane, propane and n-butane on activated carbon

Hu X., Rao G.N. and Do D.D. (1993) A mathematical model for multicomponent adsorption, desorption and displacement kinetics of ethane, propane and n-butane on activated carbon. Gas Separation and Purification, 7 4: 197-206. doi:10.1016/0950-4214(93)80018-R


Author Hu X.
Rao G.N.
Do D.D.
Title A mathematical model for multicomponent adsorption, desorption and displacement kinetics of ethane, propane and n-butane on activated carbon
Journal name Gas Separation and Purification
ISSN 0950-4214
Publication date 1993
Sub-type Article (original research)
DOI 10.1016/0950-4214(93)80018-R
Volume 7
Issue 4
Start page 197
End page 206
Total pages 10
Subject 1500 Chemical Engineering
Abstract A mathematical model allowing for macropore, surface and micropore diffusions is used to predict the multicomponent adsorption, desorption and displacement kinetics of gases on activated carbon using only information of single-component mass transfer and equilibrium. This model assumes the chemical potential gradient as the driving force for diffusion so that the concentration dependency of the surface diffusivity can be accounted for. The adsorbed species diffuse in both particle and microparticle (grain) coordinates. The local diffusion flux of the adsorbed species inside the microparticle is computed with the aid of the concept of an imaginary gas-phase concentration. The multicomponent adsorption equilibrium is calculated using the ideal adsorbed solution theory (IAST) and a single-component isotherm equation. To validate the model, experiments on equilibria as well as dynamics are carried out. Single-component adsorption equilibrium data are obtained by using a volumetric measurement rig. The dynamic responses of single and binary systems are collected via a differential adsorption bed, with ethane, propane and n-butane as adsorbates. The model predictions are found to be in good agreement with the experimental results and the role of concentration dependency of the diffusion of the adsorbed species is significant.
Keyword activated carbon
ideal adsorbed solution theory
multicomponent sorption dynamics
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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