Investigation of tertiary amine-based PILs for ideal efficient SO2 capture from CO2

Four tertiary amine-based protic ionic liquids (PILs) have been carefully designed to investigate the performance of SO 2 uptake. Their physical properties of densities and viscosities were determined. In the four PILs, the highest capacity for SO 2 of the four PILs reached up to 5.64 mol/kg ILs (P = 1.0 bar, T = 313.2 K). The ideal selectivity of SO 2 /CO 2 was up to 250 in the separation application of SO 2 from CO 2 . The kinetic study demonstrated that the PILs could efficiently capture SO 2 quickly under the ambient pressure. Based on the SO 2 absorption capacity and selectivity, excellent recyclability , and fast absorption process, the PILs in this work are considered as a potential alternative to traditional absorbents in the flue gas desulfurization (FGD).