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Solubility of Thiophene and Dibenzothiophene in Anhydrous FeCl3- and ZnCl2‑Based Deep Eutectic Solvents
journal contribution
posted on 2014-04-23, 00:00 authored by Zaharaddeen
S. Gano, Farouq S. Mjalli, Talal Al-Wahaibi, Yahya Al-Wahaibi, Inas M. AlNashefThe
solubilities of some common refractory-sulfur-containing compounds,
namely thiophene and dibenzothiophene, were studied and measured in
anhydrous FeCl3- and ZnCl2-based deep eutectic
solvents (DES) at different temperatures under atmospheric pressure.
The aim of this study is to explore the behavior of DESs toward solvation
of sulfur-containing compounds so as to set a pace for the successful
application of DESs into deep desulfurization of liquid fuels. The
studied DESs were screened and prepared by the combination of anhydrous
FeCl3 and ZnCl2 with different salts and hydrogen
bond donors. High pressure liquid chromatography (HPLC) was employed
for the quantitative measurements of solubilities of both thiophene
and dibenzothiophene. It was found that FeCl3 based DESs
exhibited higher solubilities (from 17 wt % to above 90 wt %) for
dibenzothiophene as compared to the ZnCl2 based DESs (0.084–1.389
wt %). Moreover, FeCl3 based DESs exhibited complete miscibility
with thiophene while ZnCl2 based DESs showed solubility
values in the range of 1–10 wt % for thiophene. The experimental
results obtained were further successfully modeled using the nonrandom
two liquid (NRTL) model.