Design of multiple-site imidazole derivative aqueous solution for SO2 capture in low concentration

In this work, a novel strategy was reported for improving SO2 capture through multiple-site interactions of N-imidazole derivative. The tris (2-(1-H-imidazole-1-y1)ethyl) amine (TIA) was designed, synthesised and mixed with water to form the mixed absorbents for SO2 absorption. The physical properties were determined and the mixed absorbents exhibited low densities and viscosities, which are beneficial to the mass and heat transfer. The SO2 absorption reached equilibrium rapidly within 60 s and as high as 2.09 mol SO2 per mol TIA could be absorbed at low SO2 concentration (