4 th InternatIonal ConferenCe on
advanCes In energy researCh
IndIan InstItute of teChnology
MuMbaI (M.s) IndIa.
IONIC LIQUIDS:- ENERGY EFFICIENT GREEN SOLVENT FOR THE
EXTRACTIVE DESULFURIZATION OF LIQUID FUELS
Mr. Swapnil A. Dharaskar
Dr. Kailas L. Wasewar
Dr. Mahesh N. Varma
Department of Chemical Engineering
Visvesvaraya National Institute of Technology (VNIT)
Nagpur – 440010, Maharashtra, INDIA
Why Extractive desulfurization?
In petroleum and hydrocarbon industries, various solvents such as ethers, amines,
alcohols and other volatile organic compounds have been used for the options like
extraction, absorption, azeotropic distillation etc.
These solvents have their own limitations in terms of environmental issue, recycle
ability, etc. which can be overcome by the use of ionic liquids as green solvent.
Among theses EDS seems more eye-catching because it does not require hydrogen
and catalyst and its operation conditions is mild.
Moreover, it does not alter the chemical structures of the compounds in fuel oils
and extracted S-compounds can be reused as raw materials.
A good extractant much have the following attributes:Good extractive ability for S-compounds.
Free of contamination to the fuels.
Non-toxicity, and environmental benignity.
Stability for repetitive use
Characterization of ILs
FT-IR analysis of ionic liquids
1H-NMR and 13C-NMR analysis
Results and Discussion
Preparation of Model Fuel
A model liquid fuel with 500 ppmw sulfur (DBT as sulfur source)
was prepared in n-Octane. Similarly, the model liquid fuels were
prepared by dissolving BT, T, and 3-MT individually in n-Octane
respectively. Actual diesel and gasoline with total sulfur content of
385.13 and 180.79 ppmw respectively were used.
Effect of Reaction Time on S-removal
Effect of Reaction Temperature on S-removal
Effect of S-Compound on S-removal.
Recycling of spent ILs without Regeneration.
Desulfurization of Real Fuels using imidazolium IL
Effect of reaction time on DBT removal with IL
Temperature = 30OC, Mass ratio of model fuel/IL = 5:1, Extraction time = 30
min. Initial sulfur concentration = 500 ppmw.
Effect of reaction temperature on S-removal with IL
Temperature S-content S-removal Part. Coeff.
Temperature = 30OC, Mass ratio of model fuel/IL = 5:1, Extraction time =
30 min. Initial S-concentration = 500 ppmw.
Effect of S-compound on DBT removal
Temperature = 30OC, Mass ratio of model fuel/IL = 3:1, Extraction time = 30 min. Initial sulfur concentration = 500
Reactivity sequencing was DBT > BT > T > 3-MT.
Recycling of spent ILs without regeneration
No. of Cycle
Model fuel = (n-Octane + DBT), Mass ratio of model fuel/IL = 5:1, Temperature =
30OC, Extraction time = 30 min,
Initial S-concentration = 500 ppmw.
Desulfurization of Real Fuels using ILs
Temperature = 30OC, Extraction time = 30 min,
Initial S-concentration of diesel and gasoline = 385.13 and 180.79 ppmw.
based (ILs) were synthesized and employed as an
Extractant for S-removal.
Imidazolium Ils can be used as energy efficient green material for
EDS of liquid fuels, mainly with regards to those S-compounds that
are very complex to remove by common hydrodesulfurization
The spent IL could be reused for four times with a slight decrease
Enormous saving on energy can be achieved by use of IL in
This work could be present a new alternative for extractive deepdesulfurization of liquid fuels.
The EDS method could be option for environmentally benign
method for deep desulfurization.