Investigation of furoate-based ionic liquid as efficient SO2 absorbent. (7th February 2017) - Deng, Dongshun
Abstract : A series of furoate-based ionic liquids with good absorption and separation performance for SO2 were reported. Abstract : A series of furoate anion-functionized ionic liquids (ILs) were synthesized and applied as new absorbents for SO2 . Results showed that these ILs possessed satisfactory performance for SO2 absorption. At 293.15 K, the maximum absorption capacity was 0.69 and 0.24 g SO2 per g P4442 [FA] under 1.0 and 0.1 bar, respectively. The SO2 enriched ILs were easily regenerated by bubbling N2 at 343.15 K and recycled five times without obvious loss of absorption performance. The influences of temperature, SO2 partial pressure, and water content in ILs on SO2 absorption performance were systematically explored. The absorption capacity of ILs is discussed from aspects of the structure of cations, anions, and the interaction of cation–anion. The absorption mechanism was analyzed using NMR and FTIR methods. The selectivities of SO2 /CO2, SO2 /N2 and SO2 /O2 were studied and [P4442 ][FA] achieved relatively high selectivity for SO2 compared to other gases. Present furoate ILs demonstrate potential application as a SO2 absorbent owing to their good performance.