Abstract
Ionic liquids (ILs) mixtures with water, amines, and other solvents have been receiving attention as alternative CO2 absorbents that could offer energy savings compared with traditional aqueous MEA processes and mitigate the high cost or viscosity of pure ionic liquids. In this work, mixtures of two ionic liquids (1-butyl-3-methylimidazolium acetate [bmim][OAc], 1-ethyl-3-methylimidazolium octylsulphate [emim][OcSO4]) and five amines (1,1,3,3-tetramethylguanidine (TMG), 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 1,4-diazabicyclo[2.2.2]octane (DABCO), triethylamine (TEA), and 2,2′-aminodiethanol (DEA)) were used for CO2 capture. In total, ten model systems were investigated. Generalized patterns of composition-CO2 absorption relationships were identified depending on the underlying mechanism of absorption. Viscosity, degradation and regeneration potential of the selected systems were determined. DBU-[emim][OcSO4] systems showed the temperature of regeneration as low as 60 °C. The viscosity of all systems was greatly reduced by the addition of water. Some CO2-rich solutions displayed non‐Newtonian behavior. Mechanism of CO2 absorption in imidazolium ionic liquids in the presence of DBU was confirmed based on 13C NMR.
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