Fe III -containing ionic liquids (ILs), prepared from the reaction of anhydrous FeCl 3 and imidazolium chloride ([imidazolium]Cl), were used as effective extractants for the desulfurization of a model oil containing dibenzothiophene (DBT). The amount of DBT extracted increased with an increasing molar ratio of FeCl 3 /[imidazolium]Cl. The ability of the ILs to extract DBT seems to be attributed to the combined effects of Lewis acidity and fluidity of ILs.
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Ko et al. (2008) studied this question.
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