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Figure 1. Densities (a), viscosities (b), heat capacity (c) and surface tension (d) of ChCl/Urea (1:2). Symbols: experimental data from literature or theoretical estimation of this work; Curves: fitting results with the equations embedded in Aspen. 2.1.3. Properties of aqueous ChCl/Urea (1:2) solutions. The density, viscosity, surface tension and heat capacity of aqueous ChCl/Urea (1:2) solutions have been measured experimentally and all the available sources of the experimental data were collected as listed in Table 1. The experimental data was illustrated in Figure 2 for comparison with each other. As shown in Figure 2, the available experimental densities were consistent with each other for those from the sources of 26, 27, 36, while the experimental data from Shah et al.26 was higher than others. For viscosity, the available experimental data was consistent with each other for those from the sources of 27, 28, while the experimental data from Shah et al.26 was higher than others when the mass fraction of ChCl/Urea (1:2) was larger than 0.8. Therefore, the experimental data by Shah et al.26 was questionable, and the corresponding experimental data was excluded for the further study. Therefore, only the consistent data26-28, 36 was used to obtain the interaction parameters of either Rackett liquid molar volume model or Andrade liquid viscosity model. In the software of Aspen Plus, the properties of density, viscosity and surface tension are independent, while the heat capacity is related to the NRTL model parameters. Therefore, in this work, the density, viscosity and surface tension of aqueous ChCl/Urea (1:2) were studied independently, while the heat capacity was used as the part of inputs to obtain the binary interaction parameters in NRTL model and the detailed discussion was described in the following section. 6PDF Image | CO2 Separation with Ionic Liquids
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