Optimum Performance of Extractive Desulfurization of Liquid Fuels Using Phosphonium and Pyrrolidinium-Based Ionic Liquids

Omar U. Ahmed, Farouq S. Mjalli*, Talal Al-Wahaibi, Yahya Al-Wahaibi, Inas M. AlNashef

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


Extractive desulfurization (EDS) of thiophene (T), benzothiophene (BT) and dibenzothiophene (DBT) in simulated fuel using two phosphonium and two pyrrolidinium ionic liquids was investigated. A set of single-factor-at-a-time experiments was carried out to determine factors that significantly affect the EDS process. The single-factor-at-a-time experiments indicate that high sulfur removal (SR) can be achieved using long extraction time (>60 min), high temperature, low fuel-to-solvent ratio (1:4), or large number of extraction stages (NE = 5). However, the single-factor-at-a-time experiment does not take interaction between the factors into consideration and may fail in determining a suitable operating condition. Therefore, a response surface methodology (RSM) based on Box-Behnken design was employed to study and analyze the effects of time, temperature, fuel-to-solvent ratio and their interactions on the EDS process. The ionic liquid, tetrabutylphosphonium methanesulfonate [P4444][MeSO4] yielded the best result with %SR (DBT, BT, T) of 69%, 62%, 61% at the optimum time, temperature, fuel-to-solvent ratio and mixing rate of 15 min, 30 °C, 1:1 and 800 rpm, respectively. A similar performance was obtained during the single-factor-at-a-time experiments but at less favorable conditions indicating the superiority of the statistical approach used in this work in optimizing the liquid-liquid extraction performance.

Original languageEnglish
Pages (from-to)6540-6550
Number of pages11
JournalIndustrial and Engineering Chemistry Research
Issue number25
Publication statusPublished - Jul 1 2015
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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