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temperature and pressure range. Mirza et al.45 also reported the CO2 solubility in ChCl/Urea (1:2) at very low pressures (0.04 to 0.15 MPa). The experimental data from different sources were compared, and it showed that the experimental results from Li et al.23 and Leron et al.24 were consistent with each other while those from Mirza et al. 45 were slightly lower maybe because of the high moisture content of the deep eutectic solvents. Therefore, in this work, the solubility data of Li et al.23 and Leron et al.24 was used in parameter fitting. In parameter fitting, the parameters for Henry’s constants in eq 10 and the NRTL binary interaction parameters in eq 8 were fitted simultaneously. The fitted parameters for estimating the Henry’s constants with eq 10 are summarized in Table S3, and the NRTL binary interaction parameters of CO2-ChCl/Urea (1:2) in eq 8 are summarized in Table S4. The ARDs for the CO2 solubility compared to Li et al.23 and Leron et al.24 were 1.08 and 0.61 %, respectively. To further illustrate the model performance, the modeling results were compared with the experimental data as shown in the P-T-x diagram (Figure 3). This diagram showed that the model represented the experimental data reliably throughout the investigated temperature and pressure range. Figure 3. CO2 partial pressure of ChCl/Urea (1:2)-CO2 system. Symbols, experimental data; Curves, model correlation 2.2.4. Solubility of CH4 in ChCl/Urea (1:2). Considering CH4 is one of the main components of the biogas, the NRTL binary interaction parameters between CH4 and ChCl/Urea (1:2) and the parameters for estimating the Henry’s constant were obtained from the fitting of the solubility data of CH4 in ChCl/Urea (1:2). The solubility of CH4 in ChCl/Urea (1:2) was only measured in our previous work.46 This group of data was used without further evaluation in order to obtain the model parameters. The method for parameter fitting is the same as that for CO2 in ChCl/Urea (1:2). The fitted parameters are summarized in Tables S3 and S4, respectively, and the ARD was 0.88 %.compared to the experimental data.46 The comparison of the modelling results of the CH4 solubility in ChCl/Urea (1:2) with the experimental data at different pressures and temperatures is depicted in Figure 4. Compared to the CO2 solubility in ChCl/Urea (1:2), the CH4 solubility linearly increased with increasing pressure, while the effect of the pressure on the CO2 solubility was more pronounced at relatively higher pressures. The model can represent the experimental data well based on the results illustrated in Figures 3 and 4. 10PDF Image | CO2 Separation with Ionic Liquids
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