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To understand capturing and/or enhanced gaseous selectivity of industrial flue gases containing CO 2 and SO 2 using room-temperature ionic liquids, we have developed a ternary equation of state (EOS) model for a CO 2 /SO 2 /1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([hmim][Tf 2 N]) system. The present model is based on a generic RK (Redlich−Kwong) EOS, with empirical binary interaction parameters of each binary system. These interaction parameters have been determined using our measured VLE (vapor−liquid-equilibrium) data for SO 2 /[hmim][Tf 2 N] and CO 2 /[hmim][Tf 2 N] and literature data for CO 2 /SO 2 . The validity of the present EOS has been checked by conducting ternary VLE experiments for the present system. With this EOS, isothermal ternary phase diagrams and solubility (VLE) behaviors have been calculated for various ( T, P, and feed compositions) conditions. For large and equimolar CO 2 /SO 2 mole ratios, the gaseous selectivity is nearly independent of the amount of the ionic liquid addition. However, for small CO 2 /SO 2 mole ratios the addition of the ionic liquid significantly increases the selectivity. The strong absorption of CO 2 and SO 2 in this ionic liquid may be practical for the simultaneous capture of these acid gases.
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Yokozeki et al. (2009) studied this question.
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