A series of new deep eutectic solvents (DESs)TEAC/nTFA(n=0.5

1

1.5

2) were synthesized by the reaction of tetraethylammonium chloride (TEAC) with trifluoroacetic acid (TFA) at 70℃ via simple stirring. The structure of the deep eutectic solvents was analyzed by FT-IR and 1H NMR. The removal of sulfide in model oil was studied by using TEAC/TFA as catalyst and extraction agent

and H2O2 as oxidant. The influence of n(TEAC)/n(TFA)

temperature

O/S and the type of sulfur-containing compound on the desulfurization efficiency were investigated. Under the optimal conditions

the removal rates of dibenzothiophene (DBT)

benzothiophene (BT) and thiophene (TH) were 95.4%

56.2% and 23.4%

respectively. The apparent activation energy was 56.8 kJ·mol-1 for the removal of DBT

which was estimated by first order reaction kinetics equation and Arrhenius equation. Oxidation reaction was easier to carry out because of the lower apparent activation energy. TEAC/TFA was reused for 5 times without significant decrease in activity.