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4 Results and discussion The results are briefly summarized in this chapter. Firstly, the properties of conventional ILs as well as the CO2 solubility were surveyed, collected and evaluated. The CO2 absorption enthalpy was estimated and the energy demand for solvent regeneration was analysed. Secondly, the properties of novel ILs were measured experimentally and correlated with the empirical equations, and the CO2 and CH4 solubilities in dry and aqueous ILs were measured and represented by thermodynamic models. At last, the biogas upgrading was simulated in Aspen Plus, the performance of IL-based solvents for biogas upgrading was evaluated, and the biogas upgrading with aqueous ILs was investigated with the integration of anaerobic digestion process. 4.1 Evaluation and analysis on conventional ILs 4.1.1 Data evaluation on CO2 solubility The reliable experimental data is important to the model verification and development as well as the prediction of other properties. The data evaluation is the first step for the thermodynamic modeling and energy analysis. The CO2 solubility in imidazolium-based ILs has been investigated a lot, but the evaluation has not been carried out. Therefore, the experimental CO2 solubility in imidazolium-based ILs was surveyed and evaluated in this work. To conduct evaluation, the available CO2 solubility in the evaluated ILs was collected, as shown in Table 4.1. All the experimental data was represented by NRTL-RK model, the data that shows large discrepancies from others was considered unreliable. For example, Figure 4.1 shows the comparison of CO2 solubility in [emim][BF4] at 298 K and 313 K. It can be seen that the data with inverted triangle do not follow the tendency of other data and considered as the unreliable data. The unreliable data was removed, and only the reliable data was refitted by the model, and the model parameters were obtained for further prediction of enthalpy and energy demand for IL regeneration. 21PDF Image | CO2 Separation with Ionic Liquids
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