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5 Conclusions In this work, CO2 separation with ILs was systematically studied from property measurements, thermodynamic modeling to process simulation. For conventional ILs, their available properties as well as gas solubility were surveyed and evaluated. CO2 absorption enthalpy and energy demand for IL regeneration were analysed. It was found that the trend of CO2 absorption enthalpy in ILs can be predicted from the CO2 loading based on the chain length of cation, while the influence of anion was more complicated. Based on the estimated energy demand for solvent regeneration, three ILs were screened with the lowest energy demand for different options. The pressure swing process has the lowest energy demand in the investigated cases. In addition, it was found that the available experimental gas solubilities for other gases (CH4, N2, H2, CO) was still limited, which hinders the evaluation of IL-based technology for CO2 separation. For novel ILs, the properties and gas solubilities were determined experimentally and represented by empirical equations or thermodynamic models. The effect of water on the properties of ILs and gas solubility was investigated. The results showed that the density, viscosity and gas solubilities decreased with increasing of water content and the addition of trace water decreased the viscosity of dry ILs significantly. The study of excess molar volume, excess molar activation energy, viscosity deviation and excess molar enthalpy revealed that at low water concentrations, the interactions between the IL-ion and water were strong and ion hydration was dominant. At high water concentrations, a complex structure was formed, and the mixing of two solvents was dominant. The performance of ILs for CO2 separation was evaluated by conducting process simulation of CO2 separation from biogas (biogas upgrading). It indicated that the IL-based technology was promising with respect to the amount of recirculated solvent and the total energy demand for biogas upgrading, especially for aqueous [Amim][HCOO] and aqueous ChCl/Urea. The integration of biogas upgrading with anaerobic digestion process showed that the energy demand for biogas upgrading can be decreased by increasing the methane content in biogas or by increasing the raw biogas flow rate. 47PDF Image | CO2 Separation with Ionic Liquids
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