Extractive desulfurization of fuels using diglycol based deep eutectic solvents

In this work, the effect of Deep Eutectic Solvents (DESs) on sulfur extraction of organo-sulfur compounds was investigated. Different DESs were prepared using a common hydrogen bond donor, Diglycol, and different hydrogen bond acceptors. The effects of experiment variables such as temperature, DESs/feed ratio, and the time on desulfurization efficiency of different organo-sulfur compounds were also studied. Results show that Tetra butyl ammonium bromide based DES showed relatively higher sulfur removal capabilities (Dibenzothiophene (DBT): -92 %, 2- Methylthiophene (2-MT): -86 % and Thiophene (T): -71 %)) as compared to other DESs. Also, all DESs have higher DBT extraction efficiency followed by 2-MT and T. Further, non-random two liquids (NRTL) thermodynamic model was employed to model liquid-liquid equilibrium.