Extraction Oxidative Desulfurization System Research Articles

Kinetic Modeling of the Extraction–Oxidation Coupling Process for the Removal of Dibenzothiophene

Extraction–oxidation desulfurization (EODS) technology would be a potential industrial application for achieving ultralow-sulfur fuel oils. A combined extraction–oxidation system for dibenzothiophene removal from model fuel with H2O2 as an oxidant, acetonitrile as an extractant, and Mo/γ-Al2O3 as a catalyst was performed in a batch reactor. To study this complex heterogeneous system, the chemical reaction and mass transfer on each phase were individually assessed. Kinetics of the EODS system for dibenzothiophene in model fuel was developed, comprising the chemical kinetic mechanism and mass transfer effects. The kinetic parameters of the kinetic model, such as the kinetic constants and apparent activation energy, were determined. The EODS system in the experimental condition is determined by both the extraction process and catalytic oxidation reaction, because the terms involving the intrinsic resistance of the chemical reaction are no more important than mass transfer resistance.

Syntheses of Carboxyl Functionalized Benzotriazol-based Ionic Liquids and Their Application in Extraction-oxidative Desulfurization†

A new class of ionic liquids( ILs) 1-alkyl-3-carboxymethyl double trifluoromethanesulfonimide was synthesized and characterized. Ionic liquids and hydrogen peroxide were tested in extraction-oxidative desulfurization system,and the sulphur removal efficiency of S-compounds in the model oil was investigated. The results showed that the 1-butyl-3-carboxymethyl double trifluoromethanesulfonimide salt( [C2O2BBTA][NTf2])was both extractant and catalyst,n( H2O2) ∶ n( S) = 2. 5 ∶ 1,m( Model oil) ∶ m( Ionic liquid) = 5 ∶ 1,at 75 ℃for 1 h. The ratios of desulfurization to the model oil of dibenzothiophene( DBT),benzothiophene( BT) and4,6-dimethyldibenzothiophene( 4,6-DMDBT) reached 98. 3%,98. 3% and 96. 6%. Ionic liquid can be recycled for 10 times with an unnoticeable decrease in desulfurization activity. The method can realize deep desulfurization the depth have the advantages of both simple operation and mild reaction condition.