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Fixed bed adsorption of CO2/H2 mixtures on activated carbon: experiments and modeling

Casas, Nathalie ; Schell, Johanna ; Pini, Ronny ; Mazzotti, Marco

In: Adsorption, 2012, vol. 18, no. 2, p. 143-161

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    Titre
    • Fixed bed adsorption of CO2/H2 mixtures on activated carbon: experiments and modeling
    Auteur
    • Casas, Nathalie. Institute of Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092, Zurich, Switzerland
    • Schell, Johanna. Institute of Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092, Zurich, Switzerland
    • Pini, Ronny. Department of Energy Resources Engineering, Stanford University, Stanford, USA
    • Mazzotti, Marco. Institute of Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Adsorption, 2012, vol. 18, no. 2, p. 143-161. Springer US; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:319440
    Summary
    We present breakthrough experiments in a fixed bed adsorber packed with commercial activated carbon involving feed mixtures of carbon dioxide and hydrogen of different compositions. The experiments are carried out at four different temperatures (25°C, 45°C, 65°C and 100°C) and seven different pressures (1bar, 5bar, 10bar, 15bar, 20bar, 25bar and 35bar). The interpretation of the experimental data is done by describing the adsorption process with a detailed one-dimensional model consisting of mass and heat balances and several constitutive equations, such as an adsorption isotherm and an equation of state. The dynamic model parameters, i.e. mass and heat transfer, are fitted to one single experiment (reference experiment) and the model is then further validated by predicting the remaining experiments. Furthermore, the choice of the isotherm model is discussed. The assessment of the model accuracy is carried out by comparing simulation results and experimental data, and by discussing key features and critical aspects of the model. This study is valuable per se and a necessary step toward the design, development and optimization of a pressure swing adsorption process for the separation of CO2 and H2 for example in the context of a pre-combustion CO2 capture process, such as the integrated gasification combined cycle technology