Abstract
In the present research, oxidative-extractive desulfurization (OEDS) of actual diesel fuel is executed by utilizing coordinated ionic liquid (IL), and a novel kinetic model is put forward to explain the OEDS process. A series of ILs synthesized by the coordination of three solvents [N,N dimethyl-formamide (DMF), N-methyl-pyrrolidone and dimethyl sulfoxide] with three salts (CaCl2, ZnCl2, and MgCl2) were tested for OEDS of diesel fuel. The best-performing IL i.e., DMF.ZnCl2 was utilized to investigate the impact of oxidant-to-sulfur (O/S) molar ratio, diesel-to-IL volume ratio, temperature, and time. Thermal analysis; thermogravimetric analysis-differential thermogravimetric analysis (TGA-DTG), and differential scanning calorimetry (DSC) were conducted to understand their thermal stability. 1HNMR was used to examine the interactions between their components. To understand the mechanism of removal, Fourier transform infrared (FTIR) spectra and UV–visible spectra of IL were studied. The kinetic model used in the present investigation presumed the extraction of non-oxidized as well as oxidized sulfur compounds. Compared to earlier reported models, the present novel kinetic model provided an improved representation of the kinetic data. At the optimized conditions (O/S ratio = 6:1, diesel to IL volume ratio = 3:1, and temperature = 50 °C), a maximum of 86 % sulfur removal was estimated from actual diesel fuel.
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