Desulfurization of dibenzothiophene (DBT) by a combination of both chemical oxidation and solvent extraction was investigated. Me 3 NCH 2 C 6 H 5 Cl•2ZnCl 2 ionic liquid was prepared from cheap starting materials and used as extractant for oxidative desulfurization of DBT in n-octane. DBT in oil phase was extracted into ionic liquid phase and then oxidized to its corresponding sulfone by H 2 O 2 and equal volume of acetic acid. The desulfurization yield of DBT in n-octane was 94% at 30 min under the conditions of H 2 O 2 /DBT molar ratio at 6 and V (ionic liquid) : V (n-octane) = 1 : 5, which was remarkably higher than that by mere extraction with ionic liquid (28.9%). The Me 3 NCH 2 C 6 H 5 Cl•2ZnCl 2 ionic liquid could be recycled six times without a significant decrease in activity. Kinetics of oxidative desulfurization of DBT by H 2 O 2 and acetic acid was first-order with an apparent rate constant of 0.0842 min -1 and half-time of 8.23 min.
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