Imidazolium-based zinc-containing ionic liquids (ILs), [1-R-3-R′-imidazolium]alkylsulfate-ZnCl 2 (R and R′ = H or alkyl), were highly effective for the denitrogenation of a model oil containing quinoline, indole, or acridine in n -heptane. Fast atom bombardment (FAB)−mass spectra and a computational study imply that the interaction of 1-ethyl-3-methylimidazolium ethylsulfate ([EMIm]EtSO 4 ) with ZnCl 2 produces Zn-containing ILs, presumably [EMIm]ZnCl 2 (EtSO 4 ) and [EMIm]ZnCl(EtSO 4 ) 2 as the major ionic species. The interaction of EtSO 4 − and ZnCl 2 (EtSO 4 ) − with a heterocyclic N compound was theoretically investigated. The zinc-containing IL, [EMIm]ZnCl 2 (EtSO 4 ), used for the extraction of quinoline was successfully regenerated by employing diethyl ether as a back extractant.
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Huh et al. (2009) studied this question.
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