Yan Wang1, Huaming Li1, Wenshuai Zhu1, Xue Jiang1, Jidong Lu2, Jiexiang Xia1, and Yongsheng Yan1. (1) College of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China, (2) Huazhong University of Science and Technology, State Key Laboratory of Combustion, Wuhan, 430074, China
Six types of Lewis acid ionic liquid, such as [bmim]Cl/FeCl3 (bmim: 1-butyl-3-methylimidazolium), [omim]Cl/FeCl3 (omim: 1-octyl-3-methylimidazolium), T8Cl/FeCl3 (T8Cl: tri-n-octylmethyl ammonium chloride), T4Cl/FeCl3 (T4Cl: tri-butylmethyl ammonium chloride), D10Cl/FeCl3 (D10Cl: didecyl-dimethyl ammonium chloride) and Et3NHCl/FeCl3 (Et3NHCl: hydrochloric acid triethylamine) have been synthesized and characterized. These ionic liquids were used to extraction of dibenzothiophene (DBT) remaining in n-octane. The results demonstrated that ionic liquids based FeCl3 were used as extractant for DBT-containing model oil at the mild condition and the removal of sulfur was good. Especially, Lewis acid ionic liquid with long carbon chains such as [omim]Cl/FeCl3 can obtain 71.5% sulfur removal in 30 minutes. When four steps cycle experiments were carried, [bmim]Cl/FeCl3 ionic liquid can deeply remove DBT from model oil, ledding to 97.9% sulfur removal.