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Abstract Ionic liquids (ILs) have shown great potential to be used as liquid absorbents for CO2 separation because of advantages such as non-volatility, functionality, high CO2 solubility and low energy requirements for regeneration. A significant amount of research has already been carried out, and most of them are focusing on the synthesis of ILs and measurement on CO2 solubility in ILs. However, the development of IL-based technology for CO2 separation requires experimental data, thermodynamic modeling as well as process evaluation. Therefore, a significant gap exists between new technology development and application. The goal of this work is to perform a systematic research spanning from property measurements, thermodynamic modeling to process simulation, in order to develop IL-based technology. In this work, CO2 separation with both conventional imidazolium-based ILs and novel ILs was studied. The CO2 solubility in conventional ILs (for example, bmim-, hmim-, BF4-, PF6-, Tf2N-based ILs) was surveyed and evaluated. The CO2 absorption enthalpy and the energy demand for solvent regeneration were also analysed. Based on literature survey on CH4 solubility, three ILs ([hmim][Tf2N], [bmim][Tf2N] and [bmim][PF6]) were chosen for further study with process simulation. Moreover, the density, viscosity, surface tension and heat capacity of these three ILs were surveyed and evaluated. For novel ILs, choline chloride/urea (ChCl/Urea) was chosen as the solvent to separate CO2 because of its low price and environmentally benign qualities. 1-allyl-3-methyl imidazole formate ([Amim][HCOO]) was synthesized as a tailored sorbent due to its low viscosity. The density and viscosity of dry and aqueous novel ILs were measured at different temperatures and fitted to empirical equations. The CO2 and CH4 solubilities in dry ILs as well as the CO2 solubility in aqueous ILs were measured at different pressures and represented with the thermodynamic model. The results show that the addition of water decreases the viscosity of ILs significantly, while the effects on the density and CO2 solubility are much weaker. The excess properties of aqueous ILs were further investigated to study the mechanism of mixing ILs and water. iPDF Image | CO2 Separation with Ionic Liquids
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