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The solubilities of CO2 in aqueous ChCl/Urea and aqueous [Amim][HCOO] were represented by NRTL-RK model. As shown in Figure 4.10, the model results agree well with the experimental data. The absorption of CO2 in the studied ILs in this work is considered to be physical absorption, and thus Henry’s constant of CO2 plays an important role in modeling. For aqueous ILs, Henry’s constant in the mixed solvent needs to be determined. Generally, ideal mixing rules are used to describe the Henry’s constant of a gas in a mixed solvent, especially for modeling and simulation in Aspen Plus. As shown in Figure 4.11, the Henry’s constants of CO2 in the aqueous ILs do not follow the ideal mixing rule. The similar phenomenon was also observed in the study on the Henry’s constant of CO2 in the mixture of (water + [bmim][CH3SO4]) reported by Kumelan et al. [130]. This may be caused by the water influence on the interaction between cation and anion. The addition of water in ILs might break down the interaction between cation and anion due to the ion solvation by water molecules [131], leading to structure change of ILs. The properties of ILs were then changed obviously. Figure 4.11. The Henry’s constant of CO2. (a) In aqueous ChCl/Urea. , 308.2 K; , 318.2 K; ▲, 328.2 K. (b) In aqueous [Amim][HCOO]. , 298.2 K; , 313.2 K; , 333.2 K. 4.2.3 Discussion on water effect on the properties of ILs Based on the experimental measurements on the properties and gas solubility conducted in this work and by others, it was revealed that the addition of water gives a considerable or even significant effect on the properties of ILs, leading to abnormal phenomena. To further analyse this abnormal phenomena, the excess property reflecting the non-ideal behavior of the mixture of two solvents (H2O and IL) was calculated from the measured experimental 33PDF Image | CO2 Separation with Ionic Liquids
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