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2.1.2. Temperature-Dependent Properties of ChCl/Urea (1:2). The temperature-dependent properties such as density, viscosity, surface tension and heat capacity are needed in the process simulation. These properties have been measured experimentally and all the available sources of the experimental data for ChCl/Urea (1:2) at different temperatures were collected as listed in Table 1. The comparisons of the available experimental data in Figure 1(a) showed that most of the experimental densities of ChCl/Urea (1:2) from different sources27, 28, 34-36 were consistent with each other except the data measured by Mohsenzadeh et al.,37 and then the experimental data from 37 was excluded in the further investigation. For viscosity, as we can see from Figure 1(b), the experimental data points from Mohsenzadeh et al.37 and Xie et al.27 were not consistent with other sources when the temperature was lower than 318.15 K, and they were not used in further data fitting. For the heat capacity, the experimental results from Leron et al.38 and Chemat et al.34 were consistent with each other. All the experimental data points from these two sources were used in the further data fitting. After the evaluation, the consistent experimental data of density, viscosity and heat capacity was fitted to the equations embedded into Aspen Plus, and all the fitting was conducted within Aspen Plus. The equations and parameters fitted in this work are listed in Table 2. For the density of ChCl/Urea (1:2), the liquid molar volume was first converted from the density, and then the IK-CAPE equation (eq 1 in Table 2) was used to fit the liquid molar volumes. The average relative deviation (ARD) was 0.086 % in fitting for the liquid molar volume. To further illustrate the fitting accuracy, the model results were compared with the experimental data as shown in Figure 1(a). When the temperature was lower than 348.15 K, the experimental data agreed well with each other, and the model results were consistent with the experimental data. While when the temperature was higher than 348.15 K, the experimental data showed discrepancies at 353.15 K, and the model results were within the experimental uncertainties. However, with increasing temperature, only one group of data measured by Leron et al.35 was available, and this group of data was already lower than others at 353.15 K and obviously lower than the model results when the temperature was higher than 353.15 K. Thus, the accuracy of this group of data might be questionable. For the viscosity and heat capacity of pure ChCl/Urea (1:2), the DIPPR equations (eqs 2 and 3 in Table 2, respectively) were used. The fitting results of viscosity and heat capacity for ChCl/Urea (1:2) agreed well with the data points used in fitting with ARDs of 3.1% and 0.2%, respectively. The further comparison with the available experimental data was also illustrated in Figure 1. Table 1. Sources of experimental properties Property ChCl/Urea (1:2) ChCl/Urea (1:2) -H2O Refs. Density 27, 28, 34-37 26-28, 35, 36 Viscosity 27, 28, 34, 37, 40 26-28 Heat capacity 34, 38 38 Surface tension 39-41 25 4PDF Image | CO2 Separation with Ionic Liquids
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