Carbon dioxide-methane mixture adsorption on activated carbon
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Carbon dioxide-methane mixture adsorption on activated carbon V. Goetz · O. Pupier · A. Guillot
Received: 16 September 2005 / Revised: 15 May 2006 / Accepted: 5 July 2006 C Springer Science + Business Media, LLC 2006
Abstract In this work, we report new experimental data of pure and binary adsorption equilibria of carbon dioxide and methane on the activated carbon RB2 at 273 and 298 K. The pressure range studied were 0–3.5 MPa for pure gases and 0–0.1 MPa for mixtures. The combination of the generalized Dubinin model to describe the pure CO2 and CH4 isotherms with the IAST (Ideal Adsorbed Solution Theory) for the mixtures provide a method for the calculation of the binary adsorption equilibria. This formulation predicts with acceptable accuracy the binary adsorption data and can easily be integrated in general dynamic simulation of PSA (pressure swing adsorption process) adsorption columns. It involves only three parameters, independent of the temperature, and directly determined with only one adsorption isotherm of CO2 . Keywords Adsorption . Mixture . Activated carbon . Volumetric method . Experimental data . Modelling 1 Introduction Gas adsorption is of particular interest especially because it is involved in numerous processes linked to environmental protection. Gases such as carbon monoxV. Goetz () . O. Pupier . A. Guillot PROMES-CNRS, UPR 8521: Processes, Materials and Solar Energy, Rambla de la Thermodynamique, 66100 Perpignan, France e-mail: [email protected]
ide, carbon dioxide, and hydrogen sulphide are removed by pressure swing adsorption (PSA). PSA is also involved in organic solvent vapour recovery or separation and purification of hydrogen from steam-methane reforming. In many gas adsorption processes activated carbons operate as adsorbents and the basic physical phenomenon is the adsorption of a gas mixture. Numerous experimental data are available in literature for pure gas isotherms. At the opposite, development and validation of multi-components theoretical models still suffer of a relative lack of data (Siperstein and Myers, 2001). The first objective of this paper is to provide a new set of data for the binary mixture CO2 /CH4 . It is currently involved in hydrogen production and is, to date, one of most studied mixture. Adsorption data are available in the open literature (Buss, 1995; Dreisbach et al., 1999; Van Der Vaart et al., 2000) allowing comparisons with previous experimentations. Representative chemical engineering modelling of fixed bed adsorbers needs to take into consideration coupling phenomena between multicomponent adsorption equilibria and the heat and mass transfers inside the adsorbers that generate pressures and temperatures gradients (Yang, 1986; Warmuzinski and Tanczyk, 1997). Within this framework, validation over a wide range of temperature and loading of robust, simple and self-consistent multicomponent adsorption equilibria models is the basic step. The semi-empirical Dubinin approach for pure gas isotherms modelling and more particularly the Dubinin-Astakhov (DA) (
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