Chemical Engineering & Technology, Vol.42, No.6, 1276-1282, 2019
Removal of Dibenzothiophene from Diesels by Extraction and Catalytic Oxidation with Acetamide-Based Deep Eutectic Solvents
A series of acetamide-based deep eutectic solvents (DESs) with different proportions were prepared. Extraction and catalytic oxidation desulfurization (ECODS) of the acetamide-based DESs were investigated and the process was optimized. Such DESs with a molar ratio of acetamide and p-TsOH of 1/3 (C2H5NO/3p-TsOH) exhibits such a remarkable catalytic activity that the dibenzothiophene (DBT) removal could reach 100 % under optimized conditions. C2H5NO/3p-TsOH was used for the oxidative desulfurization of actual commercial diesel. The sulfur removal of diesel achieved up to 98 %. C2H5NO/3p-TsOH could be recycled six times and the desulfurization activity was slightly decreased. Evaluation of the mechanism indicated that oxidative desulfurization (ODS) was realized via dual activation of acetamide-based DESs. A novel and effective way for deep desulfurization of diesel is provided.