Preparation of C6H11NO/2TsOH Type Deep Eutectic Solvent and Its Catalytic Performance in Oxidative Desulfurization

The deep eutectic solvents (DESs) of C6H11NO/2TsOH were synthesized through the thermal dissolution of the caprolactam and the p-toluenesulfonic acid. DESs were characterized by FT-IR and 1H NMR. C6H11NO/2TsOH as the extractant and catalyst, H2O2 as the oxidant, the remove of sulfide in the model oil by catalytic oxidation was carried out. The influences of reaction temperature, n(H2O2)/n(S), DESs dose and sulfide types on desulfurization rate were investigated. The experimental results show that the desulfurization rate of DBT, 4,6-DMDBT and BT attach 97.32%, 86.60% and 77.80%, respectively, under the condition of temperature of 60 ℃, n(H2O2)/n(S) of 4, DESs dose of 1.00 g and model oil volume of 5 mL. The catalyst can be reused for five times, and the catalytic activity does not obviously decrease. The kinetic analysis shows that the oxidation desulfurization process is according with the first order reaction kinetic. © 2019, Editorial Office of Acta Petrolei Sinica(Petroleum Processing Section). All right reserved.