Deep eutectic solvents (DESs), which
were prepared by using AlCl3, chlorinated paraffins-52,
and various aromatics, show excellent
desulfurization performance to various thiophenic sulfur compounds.
In DESs, aromatic compounds strongly influence the desulfurization
performance, and the order is toluene > p-xylene
> o-xylene > ethylbenzene > benzene >
chlorobenzene.
The DESs containing toluene (DES-T) can deeply remove the three thiophenic
sulfur compounds, that is, 3-methylthiophene, benzothiophene, and
dibenzothiophene, within 10 min at 293 K. The extractive desulfurization
mechanism is considered to be a π–π interaction
of the aromatic ring along with the acid–base complexation.
Satisfactorily, the extractive desulfurization is still effective
for real oils, and real oil quality is improved in this process.
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