Measurement and prediction of adsorption equilibrium for a H2/N2/CH4/CO2 mixture

Abstract

AbstractAdsorption equilibrium data for the pure gases, H2, N2, CH4, CO2, and a H2/N2/CH4/CO2 mixture on activated carbon JX101 were collected by static and dynamic methods, respectively. The tested range covered temperatures of 283–328 K and pressures up to 30 × 105 Pa. The difference in the adsorption mechanisms between the super‐ and sub‐critical components was considered for both correlation of pure gas adsorption and prediction of multicomponent adsorption equilibrium. The surface heterogeneity, interaction among the adsorbed molecules, and the non‐ideal behavior of the adsorbed phase were also accounted for. As a consequence, the pure gas adsorption data were accurately correlated, and the multicomponent adsorption equilibrium was satisfactorily predicted by a proposed model. Applicability of the new model was verified with the present experimental data and with literature values. In all cases, the new model produced better agreement between the predicted data and the experimentally measured data than previous models. This indicates that the new model is probably applicable to predict the adsorption equilibrium of gas mixtures either partially or totally composed of supercritical gases. © 2007 American Institute of Chemical Engineers AIChE J, 2007