石油炼制与化工

• 基础研究 • 上一篇    下一篇

新型离子液体对苯并噻吩、二苯并噻吩的萃取性能研究

张进 朴香兰 朱慎林   

  1. 清华大学化工系 清华大学化工系 清华大学
  • 收稿日期:2007-07-25 修回日期:1900-01-01 出版日期:2008-02-12 发布日期:2008-02-12
  • 通讯作者: 朴香兰

STUDY ON THE EXTRACTION PERFORMANCE OF NEW IONIC LIQUID FOR REMOVING BENZOTHIOPHENE AND DIBENZOTHIOPHENE

PIAO Xiang-Lan   

  • Received:2007-07-25 Revised:1900-01-01 Online:2008-02-12 Published:2008-02-12
  • Contact: PIAO Xiang-Lan

摘要: 离子液体是一种优良的绿色溶剂,可应用在石油油品脱硫工艺中,以降低燃油对环境的污染。本文合成了五种新型离子液体[bmim]AlCl4, [bmin]TBP, [bmim]BeS, [bmim]PF6, [bmim]BF4,并将他们用于油品脱硫的模拟体系。比较了五种离子液体萃取性能,结合分子间作用力的理论和价键理论阐述了离子液体萃取脱硫的机理。结果表明,离子液体的萃取性能与其阴离子结构有关,其中[bmim]TBP适宜作萃取脱硫溶剂。苯并噻吩(BT)、二苯并噻吩(DBT)在模拟油品中的初始浓度分别为1000μg/g时,用[bmim]TBP经四级错流萃取和5级逆流萃取,含硫量均能降至50μg/g以下。

关键词: 离子液体, 萃取溶剂, 脱硫

Abstract: Five kinds of ionic liquid (IL), [bmim]AlCl4, [bmin]TBP, [bmim]BeS, [bmim]PF6, and [bmim]BF4, were synthesized and used to extract Benzothiophene (BT) and Dibenzothiophene (DBT) in model fuels. The desulfurization mechanism of using IL as green solvent was discussed based on intermolecular force theory and valence bond theory, and the extraction performance of the five prepared ILs was compared. Results confirmed that the removal of sulfur compounds was affected by the anion structure of IL, and [bmim]TBP was an effective solvent for removing sulfur compounds comprehensively. Model fuels, octane containing 1 000 μg/g BT or 1 000 μg/g DBT, were treated with [bmim]TBP by 4 stage cross-current extraction or 5 stage counter-current extraction, and the contents of BT and DBT in the model fuels could be reduced to less than 50μg/g, respectively.

Key words: ionic liquids, extraction solvent, desulfurization