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The preliminary study showed that ideal mixing rules without adjustable parameters cannot be used to represent the properties of aqueous ChCl/Urea (1:2) well, and the excess properties should be considered. Therefore, the Rackett liquid molar volume model was used to describe the density of the mixture in which the interaction parameters were obtained from the fitting of the consistent density data.26, 27, 36 The ARDs between all of the available experimental data26-28, 36 and modeling results for density are listed in Table 4 with a value less than 1 %. Compared the modelling results with the data from Shah et al.26, the ARD is 7.6 %, which is much higher than 1 %. The Andrade liquid viscosity model was used to describe the viscosity of the mixture with the interaction parameters fitted to the consistent experimental data. The ARDs for the viscosity compared to Yadav et al. 28 and Xie et al. [27] were 6.43 and 11.2 %, respectively. While compared to Shah et al. 26, the ARD was 40.6 %. Figure 2 further illustrated the comparison of the experimental density and viscosity with the calculated results at 303.15 K as one example with good agreements, meanwhile, the viscosity changed greatly when the mass fraction of ChCl/Urea (1:2) changed from 0.7 to 1, and the experimental data from different sources showed relatively high discrepancies in this region. For the surface tension of aqueous ChCl/Urea (1:2), it was calculated from the mole-fraction average of liquid surface tension of each pure component. Only one group of data measured by Ji et al.25 was available, and the model prediction provided an ARD of 9.97 % as listed in Table 4. As we discussed above that the surface tension of ChCl/Urea (1:2) with a small amount of water (0.52 wt. %) reported by Ji et al. 25 was higher than those reported by others, thus the deviation might be from the experimental data itself. Table 4. Comparison between the experimental data and model results for viscosity, density, heat capacity and surface tension of aqueous ChCl/Urea (1:2) Property Density Viscosity T (K) 303.15 298.15-323.15 293.15-363.15 298.15-333.15 293.15-353.15 303.15 293.15-363.15 298.15-333.15 303.15-353.15 Mass fraction of ChCl/Urea (1:2) 0-1 0.348-1 0-1 0-1 0-0.994 0-1 0-1 0-1 0.348-1 ARD/% 7.61 0.675 1.01 0.746 1.00 40.6 6.43 11.2 3.74 Refs. Shah et al. 26 Leron et al. 35 Yadav et al. 28 Xie et al. 27 Su et al.36 Shah et al. 26 Yadav et al. 28 Xie et al. 27 Leron et al. 38 Heat capacity Surfacetension307.9-337.7 0.521-0.995 9.97 Jietal.25 7PDF Image | CO2 Separation with Ionic Liquids
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