Extraction of Sulphur Species Using Deep Eutectic Solvent

The burning of fuel containing sulphur compound produce sulphur oxides
(SO2) and can be considered a major source of pollution. Therefore, many research
has been conducted to reduce the sulphur content in the fuel to meet the regulation
requirement. In this study, deep eutectic solvents (DES) are synthesized using
choline chloride and glycerol. The prepared DES are characterized using density
meter. Then, performance of the DES for deep desulphurization of model oil via
liquid-liquid extraction are monitored. The performance DES indicated by the
extraction efficiency by measure the concentration sulphur using gas
chromatography. The extraction conducted by mixing n-dodecane containing sulphur
as model oil and synthesized DES. The experiment conducted at room temperature,
the mixture stirred at 400rpm for 3hrs. Lastly, the extraction efficiency of recycle
DES without regeneration monitored. The parameters interested in the experiment
are effect of initial concentration of model oil, volume ratio between model oil and
DES and the molar ratio between glycerol and choline chloride. The density value
for DES with molar ratio choline chloride: glycerol of 1:1, 1:2, 1:3 and 1:4 are
1.1545, 1.1980, 1.2050 and 1.2100 g/cm3 respectively. The extraction efficiency
decrease as the initial concentration increase. The highest extraction efficiency for
DBT and BT are 78.68 and 75.33% at 50ppm. DBT has higher selectivity than BT
therefore, DBT more easily to extract than BT. Extraction efficiency decrease as the
volume model oil increases at fixed model oil volume. The extraction efficiency for
DES: model oil volume ratio 1:5, 1:10, and 1:20 are 63.7%, 62.92% and 60.9%
respectively. Then, extraction efficiency DES decreases after being recycle for two
times. The extraction efficiency for no of cycle 1 and 2 are 60.4576 rand 55.9654 %
respectively.