Study on extractive and catalytic oxidative desulfurization of DBT ‎using [OMIM]Cl and [OMIM]FeCl4 ionic liquids
1chemistry & chemical engineering research center of Iran (CCERCI)
2Mazandaran university of science and technology, Mazandaran, Iran
In this work, 1-Octyl-3-Methylimidazolium chloride ([OMIM]Cl) and 1-Octyl-3-‎Methylimidazolium tetrachloroferrates ([OMIM]FeCl4) ionic liquids (ILs) were synthesized and ‎examined in extractive and catalytic oxidative desulfurization of dibenzothiophene (DBT) in a ‎simulated diesel fuel. For oxidative desulfurization, hydrogen peroxide (H2O2, 30 wt.%) was used ‎as the oxidant. The synthesized ILs were characterized using FT-IR and H-NMR analysis ‎methods. The desulfurization results indicated 100% removal of DBT in the ODS of simulated oil ‎using [OMIM]FeCl4 as a catalyst and extraction solvent at ambient temperature, atmospheric ‎pressure, using a low oxidant consumption at H2O2/Sulfur molar ratio of 5 and VIL/VOil of 1/10 ‎mL/mL. The extraction of DBT and sulfone products was resulted throgh - interaction between ‎the cation ring of IL and the unsaturated bonds of thiophenic ring of DBT. Morover, the ‎formation of -complexation between lone pair electrons of sulfur atom in DBT and the ‎tenantless orbital on Fe transition metal ion resulted in a high ODS efficieny of [OMIM]FeCl4. ‎