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

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

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
Volume54
Issue number25
DOIs
Publication statusPublished - Jul 1 2015

ASJC Scopus subject areas

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

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