Deep desulfurization of model oil by extraction with a low-viscosity ionic liquid [BMIM]SCN

In this work, a low-viscosity ionic liquid 1-buthyl-3-methylimidazole thiocyanate ([BMIM]SCN) was utilized as extractant for the extractive desulfurization of thiophene in model oil. Several conditions were investigated respectively, including extraction time, temperature, and volume ratio of ionic liquid to model oil. Also the kinetics of extraction of thiophene were proposed. Under the optimal extractive conditions, the removal of thiophene in model oil was 55.6%. Other sulfur compounds and real oil were also investigated. Furthermore, the total desulfurization efficiency could reach 98.3%. In addition, the ionic liquid could be recycled seven times with negligible decrease in activity.