Abstract
The oxidative desulfurization of dibenzothiophene (DBT) in n-octane as model oil with Brönsted acidic ionic liquids (ILs) N-methyl-pyrrolidonium phosphate ([Hnmp]H 2PO 4) as catalytic solvent and H 2O 2 as oxidant was optimized by orthogonal experiments. 99.8% of DBT in the model oil was removed under the optimal conditions of molar ratio of H 2O 2 to sulfur of 16:1, reaction temperature of 60°C, reaction time of 5 h, and volume ratio of model oil to ILs of 1:1. The desulfurization efficiency of actual diesel was 64.3% under the optimized conditions. The influences of the desulfurization efficiency of DBT decreased in the following order: oxidation temperature > oxidation time> molar ratio of H 2O 2/sulfur (O/S) > volume ratio of [Hnmp]H 2PO 4 to model oil ( V IL/ V model oil), according to extreme analysis of orthogonal test. The IL [Hnmp]H 2PO 4 can be recycled six times without a significant decrease in activity.
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