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4.3.3 Comparison and evaluation on the performance of ILs Based on the preliminary investigation (Table 4.9), it is found that [bmim][Tf2N] is the most promising IL with the lowest energy demand among the investigated conventional ILs. For ChCl/Urea, the investigation shows that the solvent with 50 wt % ChCl/Urea is the suitable one. For [Amim][HCOO], the solvent with 90 wt % [Amim][HCOO] was chosen for the further study considering the viscosity. Therefore, the performances of H2O, 50 wt % ChCl/Urea-H2O, 90 wt % [Amim][HCOO]-H2O and [bmim][Tf2N] were studied. Figure 4.18 shows the comparison of the densities and viscosities of these representative solvents. It can be seen that the densities of two aqueous ILs are similar to each other and lower than that of [bmim][Tf2N]. The viscosities of the solvents follow the same order with their densities, i.e. H2O < (50 wt % ChCl/Urea-H2O) < (90 wt % [Amim][HCOO]-H2O ) < [bmim][Tf2N]. Figure 4.18. (a) density and (b) viscosity of four solvents. For chemical absorption, the gas absorption capacity (i.e. loading) is a key factor to determine the performance of solvent. While for physical absorption, both gas absorption capacity and selectivity are the vital factors. Figure 4.19 compared the CO2 loadings in these four solvents. The results show that the CO2 loading in aqueous ChCl/Urea is the highest. 43PDF Image | CO2 Separation with Ionic Liquids
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