Analysis of multicomponent adsorption kinetics on activated carbon

Ding, L. P. and Bhatia, S. K. (2003) Analysis of multicomponent adsorption kinetics on activated carbon. Aiche Journal, 49 4: 883-895. doi:10.1002/aic.690490408


Author Ding, L. P.
Bhatia, S. K.
Title Analysis of multicomponent adsorption kinetics on activated carbon
Journal name Aiche Journal   Check publisher's open access policy
ISSN 0001-1541
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.1002/aic.690490408
Volume 49
Issue 4
Start page 883
End page 895
Total pages 13
Place of publication New York, NY, USA
Publisher Amer Inst Chemical Engineers
Language eng
Subject C1
290603 Membrane and Separation Technologies
780199 Other
Abstract An integrated mathematical model for the kinetics of multicomponent adsorption on microporous carbon was developed. Transport in this bidisperse solid is represented by balance equations in the macropore and micropore phases, in which gas-phase diffusion dominates the mass transfer in the macropores, with the phenomenological diffusivities represented by the generalized Maxwell-Stefan (GMS) formulation. Viscous flow also contributes to the macropore fluxes and is included in the MS expressions. Diffusion of the adsorbed phase controls the mass transfer in the micro ore phase, p which is also described in a similar way by the MS method. The adsorption isotherms are represented by a new heterogeneous modified vacancy solution theory formulation of adsorption, which has proved to be a robust method for adsorption on activated carbons. The model is applied to the coadsorption and codesorption of C2H6 and C3H8 on Ajax and Norit carbon, as well as the displacement on Ajax carbon. The effect of the viscous flow in the macropore phase is not significant for the cases studied. The model accurately predicts the overshoot behavior and rollup of C2H6 during coadsorption. The prediction for the heavier compound C3H8 is always satisfactory, though at higher C3H8 mole fraction, the overshoot extent of C2H6 is overpredicted, possibly due to neglect of heat effects.
Keyword Engineering, Chemical
Vacancy Solution Theory
Maxwell-stefan Model
Surface-diffusion
Gas-mixtures
Binary Diffusion
Monte-carlo
Zeolites
Diffusivities
Hydrocarbons
Simulations
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 11:54:49 EST