Removal of mercaptans from light oils using ionic liquid-NaOH aqueous solution as extractants

doi:10.1016/j.cjche.2016.08.031

摘要/Abstract

摘要： The application of ionic liquids as alternatives to conventional organic solvents in the extraction process has been investigated. In the present study, fourteen species of imidazolium-based ionic liquids were added into the NaOH (aq) to remove the mercaptans. The influences of anion species and cation alkyl chain length of the imidazolium-based ionic liquids on the performance of mercaptan removal from light oils have been discussed. The efficiency of extraction for mercaptans exhibited the order of [Ac]^- > [OH]^- ≈[Br]^- > [BF₄]^-. The longer alkyl chain imidazolium-based ionic liquids contributed to enhance desulfurization rate of 1-butyl mercaptan. 100% desulfurization rate of 1-butyl mercaptan was achieved by the anion of Ac^- ionic liquids and NaOH (aq) at a volume ratio of 40:1 (V(oil):V(ionic liquid)) and a short equilibrium time within 10 min.

关键词: Extraction, Ionic liquids, NaOH, Light oil, Mercaptan removal

Abstract: The application of ionic liquids as alternatives to conventional organic solvents in the extraction process has been investigated. In the present study, fourteen species of imidazolium-based ionic liquids were added into the NaOH (aq) to remove the mercaptans. The influences of anion species and cation alkyl chain length of the imidazolium-based ionic liquids on the performance of mercaptan removal from light oils have been discussed. The efficiency of extraction for mercaptans exhibited the order of [Ac]^- > [OH]^- ≈[Br]^- > [BF₄]^-. The longer alkyl chain imidazolium-based ionic liquids contributed to enhance desulfurization rate of 1-butyl mercaptan. 100% desulfurization rate of 1-butyl mercaptan was achieved by the anion of Ac^- ionic liquids and NaOH (aq) at a volume ratio of 40:1 (V(oil):V(ionic liquid)) and a short equilibrium time within 10 min.

Key words: Extraction, Ionic liquids, NaOH, Light oil, Mercaptan removal

Jianwei Li, Xiang Li, Yan Liu, Jie Zhang. Removal of mercaptans from light oils using ionic liquid-NaOH aqueous solution as extractants[J]. , 2017, 25(2): 171-174.

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