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Figure 6. Molar heat capacity of ChCl/Urea (1:2)-H2O system. x1 is the mole fraction of ChCl/Urea (1:2). Symbols, experimental data (Leron et al.38); Curves, model correlation. 2.2.6. Gas solubility in aqueous ChCl/Urea (1:2). The solubility of pure gas in aqueous ChCl/Urea (1:2) is greatly affected by the binary interaction between H2O and ChCl/Urea (1:2). Among the gas studied, only the solubility of CO2 in aqueous ChCl/Urea (1:2) was measured experimentally. Su et al.36 determined the CO2 solubility in aqueous ChCl/Urea (1:2) at different temperatures and water contents and 0.1 MPa. Xie et al.27 determined the CO2 solubility in aqueous ChCl/Urea (1:2) with low water content at different temperatures and pressures. Hsu et al.48 determined the CO2 solubility in aqueous ChCl/Urea (1:2) with a large percentage of H2O (30 wt. %, 40 wt. %, and 50 wt. %) at different temperatures and pressures. The experimental data from different sources shows inconsistent, and the CO2 solubility data from Su et al.36 is much lower than those from the other two sources. The fitted parameters of the NRTL model and those for estimating the Henry’s constants of CO2-ChCl/Urea (1:2) together with the parameters existed in the Aspen databank were used to predict the CO2 solubility in ChCl/Urea (1:2)-H2O. The comparison of the calculated results of the CO2 solubility in ChCl/Urea (1:2)-H2O with the experimental data from different sources is depicted in Figure 7. The average deviations (ADs) on the CO2 solubility between the calculated and experimental results by Xie et al.27, Hsu et al.48 and Su et al.36 were 0.016, 0.011 and 0.009, respectively, while the corresponding ARDs were 16 %, 71 % and 332 %, respectively. As the experimental CO2 solubility in ChCl/Urea (1:2)-H2O from Xie et al. [27] agreed well with the model prediction based on both AD and ARD, the fitted parameters listed in Tables S3 and S4 can be used to predict the CO2 solubility in ChCl/Urea (1:2)-H2O for process simulation. 12PDF Image | CO2 Separation with Ionic Liquids
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