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display consistency with the experimental data. The fitted parameters can be implemented into Aspen Plus to perform the process simulation for CO2 separation. Besides the CO2 and CH4 solubility in dry ILs, the CO2 solubility in aqueous ChCl/Urea was measured at pressures up to 4.5 MPa and temperatures of 308.2, 318.2 and 328.2 K, and the CO2 solubility in aqueous [Amim][HCOO] was measured at pressures up to 1.8 MPa and temperatures of 298.2, 313.2 and 333.2 K. Figure 4.10(a) illustrates the experimental CO2 solubility in aqueous ChCl/Urea at 318.2 K. The CO2 solubility increases with increasing pressure. The increase of water content leads to the decrease of CO2 solubility, but the influence of water content on the CO2 solubility is not significant compared to its influence on the viscosity. For example, the CO2 solubility decreases by 31% at 318.2 K and 4.4 MPa while the viscosity decreases by 71% at 318.2 K when the mole fractions of water increase from 0 to 0.18. Figure 4.10(b) shows the CO2 solubility in aqueous [Amim][HCOO] at 298.2 K. Similar to aqueous ChCl/Urea, the CO2 solubility in aqueous [Amim][HCOO] increases with increasing pressure and decreasing water content. For example, at 298.2 K and 1 MPa, the mole fraction of CO2 decreases from 0.226 to 0.098 when the mole fraction of water in aqueous [Amim][HCOO] increases from 0 to 0.509. When the mole fraction of water is higher than 0.8, the decrease of CO2 solubility is not significant with the further increase of water content. Figure 4.10. The solubility of CO2. Symbols: experimental data (a) in aqueous ChCl/Urea. Water mole fractions: , 0; , 0.0185; , 0.0910; , 0.183. (b) in aqueous [Amim][HCOO]. Water mole fractions: , 0; , 0.509; , 0.687; , 0.846; , 0.962. Curve: correlations. 32PDF Image | CO2 Separation with Ionic Liquids
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