FE-BASED IONIC LIQUIDS SYNTHESIZED BY ULTRASONIC HEATING CIRCUMFLUENCE: CHARACTERIZATION AND DESULFURIZATION.

1-butyl-3-methylimidazolium chloride ([Bmim]Cl) was synthesized by ultrasonic heating circumfluence method and used as the intermediate for preparing Fe-based ionic liquids (Fe-ILs). By introducing the ultrasonic oscillation, the structure of [Bmim]Cl was unaffected but the reaction was shortened, achieving a good yield. The prepared [Bmim]Cl was mixed with FeCl₃·6H₂O at different mole ratios to synthesize Fe-ILs. The characteristic results showed that Fe-ILs have excellent thermal stability and FeCl₄ - is the principal anion in Fe-ILs. A ternary desulfurization solution consisted of prepared Fe-ILs, water, and ethanol was applied for the flue gas desulfurization. Different compositions of desulfurization solution have great effects on the desulfurization efficiency and water is an indispensable component for SO₂ removal. Fe-ILs with different mole ratios of [Bmim]Cl to FeCl₃·6H₂O exhibit different SO₂ removal activities. When the mass ratio of Fe-ILs, water, and ethanol is at 1:2:4, Fe-IL1 has the highest SO₂ adsorption capacity of 69.35 mg/g while Fe-IL3 has the maximum SO₄ ^2- conversion rate of 42.3%, indicating that the prepared Fe-ILs have dual functions of adsorbent and catalyst and are able to catalytically oxidize SO₂ to form H₂SO₄ in the presence of O₂ and H₂O. [ABSTRACT FROM AUTHOR]