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In this work, the extractive desulfurization of liquid fuel was investigated using a new polymeric DES based on the salt tetrabutyl ammonium bromide (TBAB). Two different light grades of Polyethylene glycol (PEG) were used as hydrogen bond donors. Central Composite Design (CCD) was employed to optimize the operating conditions. The solvents showed high sulfur removal efficiency of DBT and thiophene...