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The CO2 solubility in the aqueous [Amim][HCOO] decreased with increasing water concentration. Upon addition of 0.1 mass fraction of water to dry [Amim][HCOO] at 298.2 K and 1 MPa , the CO2 solubility decreased from 0.226 to 0.098 (a decrease of 57%). However, the CO2 solubility decreased from 0.054 to 0.044 (a decrease of 19%) when the mass fraction of water increased from 0.37 to 0.73. It indicates that the CO2 solubility significantly decreased upon the addition of a small amount of water in the IL, while the effect of water on the CO2 solubility was not notable at high water concentrations. The decrease in the CO2 solubility upon addition of water into the [Amim][HCOO] can be explained with the strong interaction between water and IL, i.e. the stronger interaction of H2O- [Amim][HCOO] compared to that of CO2-[Amim][HCOO] appears to degas CO2 out of the solvent system. 3. Thermodynamic modeling 3.1 Thermo-physical properties of ILs 3.1.1 Property estimation For ILs, the critical physical properties cannot be experimentally determined. In this work, they were estimated by the group contribution method developed by Valderrama et al. [17, 18], and the results are listed in Table 4. Table 4. Estimated properties of the [Amim][HCOO] IL. IL Tb,K Tc,K Pc,Mpa Vc,cm3/mol Zc ω [Amim][HCOO] 667.5 909.3 3.319 521.3 0.229 0.799 3.1.2 Dry [Amim][HCOO] The experimental density and viscosity of dry [Amim][HCOO] were correlated by the empirical equations: ( 1 ) (2) where V represents the mole volume in cm3·mol-1, M is the molecular weight of the [Amim][HCOO] (168.19 g mol-1), ρ is the liquid density in g·cm-3, η is the liquid viscosity inPDF Image | CO2 Separation with Ionic Liquids
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