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ID: 611390.0, MPI für Dynamik komplexer technischer Systeme / Physical and Chemical Foundations of Process Engineering
Use of Adsorbed Solution theory to model competitive and co-operative sorption on elastic ion exchange resins
Authors:Heinonen, Jari; Rubiera Landa, H. O.; Sainio, Tuomo; Seidel-Morgenstern, Andreas
Date of Publication (YYYY-MM-DD):2012
Title of Journal:Separation and Purification Technology
Start Page:235
End Page:247
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:An Adsorbed Solution theory which takes into account non-idealities in both the adsorbed and the liquid phase was applied for the prediction of multi-component adsorption equilibria based on single component and binary mixture data. A novel non-iterative solution method was applied for the solution of the set of partly implicit model equations. The Pitzer activity coefficient model was used for the liquid phase and an empirical model for the adsorbed phase activity coefficients. Separation of concentrated acid lignocellulosic hydrolysates on an elastic strong acid cation exchange resin was used as a test system. The application is relevant in biorefineries when polysaccharides in wood are hydrolyzed to monosaccharides using concentrated sulfuric acid.
It was found that the novel solution method for the equilibrium model can be applied successfully for complex multi-component systems; it is fast and easy to implement. The predictions of the thermodynamic model were validated with dynamic column experiments (pulse injections and loading/elution curves). Hereby, in the column mass balances, porosity fluctuations were taken explicitly into account. Satisfactory correlation between the calculated and experimental results was obtained. It was observed that the predictions of the model can be quite sensitive with respect to even minor inaccuracies in the calculated multi-component adsorption isotherms.
Copyright © 2012 Elsevier B.V. All rights reserved. [accessed August 14th 2012]
Free Keywords:Adsorbed Solution theory; Ion exchange resin; Electrolyte; Non-electrolyte; Chromatographic separation
External Publication Status:published
Document Type:Article
Communicated by:Andreas Seidel-Morgenstern
Affiliations:MPI für Dynamik komplexer technischer Systeme/Physical and Chemical Foundations of Process Engineering
External Affiliations:Lappeenranta University of Technology,

Otto-von-Guericke-Universität Magdeburg,
Institut für Verfahrenstechnik,
Universitätsplatz 2, 39106 Magdeburg, Germany
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