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ChCl/Urea changes from 1571 to 107.7 mPa·s when the temperature changes from 298.15 to 333.15 K. Water content has a significant effect on the viscosity of ChCl/Urea. For example, at 298.15 K, the viscosity of aqueous ChCl/Urea decreases to 323.9 mPa·s when the mole fraction of water is 0.1525, which is only 1/5 of the viscosity of dry ChCl/Urea (1571 mPa·s). With further increase of water content, the viscosity keeps decreasing, but not as notable as those at higher ChCl/Urea concentrations. For ChCl/Urea, the discrepancies exist for the viscosity measured in this work and by others. For example, at 313.2 K, the viscosity of ChCl/Urea is 403.2 mPa·s from this work, while the viscosities are 209.3 mPa·s from the work of Abbott et al. [29], 338.7±0.4 mPa·s from the work of Ciocirlan et al. [128] and 238.1 mPa·s from the work of Yadav et al. [129]. The relative deviations in viscosity at this temperature are 48%, 16% and 41%, respectively. The deviations may be due to the impurity of ChCl/Urea, especially the water content. Figure 4.6. Density (a) and viscosity (b) of the mixture of ChCl/Urea (1:2) and water. Symbols: experimental with different mole fractions of water , 0, this work; ►,0, Ciocirlan et al.[128]; , 0, Abbott et al.[29]; +, 0, Yadav et al.[129]; , 0.1525; , 0.2566; , 0.3647; , 0.4670; , 0.5742; , 0.6880; ,0.8269. Curves: correlations. The density and viscosity of dry and aqueous [Amim][HCOO] were measured at temperatures ranging from 293.15 to 333.15 K at atmospheric pressure. The measured experimental results are shown in Figure 4.7. The observations are similar to those of ChCl/Urea. With the increase of temperature and water content, the density and viscosity decrease. Compared to the properties of ChCl/Urea, both the density and viscosity of [Amim][HCOO] are lower. The water influence on the viscosity is not notable, especially at high water concentrations. 29PDF Image | CO2 Separation with Ionic Liquids
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