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Abstract
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Describes
synthesis of a series of the imidazolium-based phosphoric ionic liquids,
N-methyl-N-methylimidazolium dimethyl phosphate ([Mmim]DMP),
N-ethyl-N-methylimidazolium diethyl phosphate ([Emim]DEP), and
N-butyl-N-methylimidazolium dibutyl phosphate ([Bmim]DBP). They were employed
in the extraction and catalytic oxidation desulfurization system (ECODS) for
the removal of 4,6-dimethyldienzothiophene (4,6-DMDBT) from a model oil, with
hexaammonium heptamolybdate tetrahydrate ((NH4)6Mo7O24·4H2O) as catalyst and
30 wt % hydrogen peroxide (H2O2) solution as oxidant. Researchers studied the
effects of the type of ionic liquid, amount of catalyst and H2O2, ILs/oil
mass ratio, reaction time, reaction temperature, and regeneration of ionic
liquid on the 4,6-DMDBT removal of a model oil. Results indicate that a
sulfur system containing H2O2, (NH4)6Mo7O24·4H2O, and [Bmim]DBP, exhibited
such a high catalytic activity that the removal of 4,6-DMDBT could reach
89.2% at 50 °C in 3 h, which was significantly superior to mere solvent
extraction with IL (9.29%) or catalytic oxidation without IL (5.34%).
The
desulfurization system for a model oil could be recycled six times with no
noticeable decrease in activity. (NH4)6Mo7O24·4H2O not only possessed good
catalytic activity but barely contaminated the oil. Study results demonstrat
that ECODS containing (NH4)6Mo7O24 ·4H2O, [Bmim]DBP, and H2O2 may be a new
option for producing cleaning fuel.
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