Feasibility of phosphonium-based ionic liquids as solvents for extractive desulfurization of liquid fuels

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Abstract

Binary solid-liquid equilibria for phosphonium based ionic liquids with dibenzothiophene (DBT) were measured within the temperature range of 303.15-353.15K. The influence of temperature and ionic liquid structure on solubility of dibenzothiophene is presented. The solubility of DBT in all tested ionic liquids increased with temperature and as high as 52.93wt% DBT in solution was obtained at 353.15K. At this temperature, the solubility of DBT in ILs based on the trihexyl(tetradecyl)phosphonium cation depends on the anion of the IL. This dependency was found to be in the order; Cl->Br-≈N(CN)2->[NTf2]-> bis(2,4,4-trimethylpentyl)phosphinate. The experimental solubility data was satisfactorily correlated using NRTL thermodynamic model. Finally, more than 99% (DBT) and 96% (thiophene) sulfur removal were achieved after 4th and 5th extraction stages respectively using the triisobutyl(methyl) phosphonium tosylate ionic liquid under mild operating conditions.

Original languageEnglish
Pages (from-to)102-109
Number of pages8
JournalFluid Phase Equilibria
Volume401
DOIs
Publication statusPublished - Sep 5 2015

Keywords

  • Dibenzothiophene
  • Ionic liquids
  • NRTL
  • Phosphonium
  • Solubility
  • Thiophene

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

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