Deep oxidative-extractive desulfurization of fuels using benzyl-based ionic liquid

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• 作者：Mingxia Li ; Zhiyong Zhou ; Fan Zhang ; Wenshuai Chai ; Lele Zhang and Zhongqi Ren
• 刊名：AIChE Journal
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：62
• 期：11
• 页码：4023-4034
• 全文大小：964K
• ISSN：1547-5905

文摘

Four benzyl-based ionic liquids (ILs) were synthetized and used for deep desulfurization of model oil and real diesel fuel. The removal efficiencies of benzothiophene (BT) and dibenzothiophene (DBT) with [Bzmim][NTf₂] and [Bzmim][SCN] as extractants are higher than that with [Bzmp][NTf₂] and [Bzmp][SCN] as extractants. The desulfurization capability follows the Nernst's Law. A reactive extraction mathematical model for desulfurization was established. An oxidative-extractive two-step deep desulfurization method was developed. DBT was first oxidized by H₂O₂ with CH₃COOH as catalyst and then the unoxidized DBT and uncrystallized dibenzothiophene sulfoxide (DBTO₂) in model oil were extracted by [Bzmim][NTf₂], and finally the removal efficiency was 98.4% after one-stage extraction. Besides, the removal efficiency of 4,6-DMDBT was 96.4% after oxidation and one-stage extraction processes. Moreover, the oxidative-extractive two-step deep desulfurization method was also effective for desulfurization of diesel fuel. The removal efficiency of sulfur reached up to 96% after oxidation and three-stage cross-current extraction processes.