Deep Desulfurization of Light Oil Using the Imitating Silver Salt ILs Method.

Sulfides in oils are harmful in many ways, in particular, deterioration of the environment resulting from sulfur dioxide. A novel desulfurization process for light oil has been investigated. A mixture consisting of benzothiophene (BT), dibenzothiophene (DBT), and oil fractions (235°C–270°C) refined by acid–alkali treatment was employed for alkylation desulfurization tests in a nitrogen atmosphere. The results showed that at a reaction temperature of 30°C, ratio of bromoethane (CH3CH2Br) to sulfur of 30:1 (mol/mol), ratio of silver tetrafluoroborate (AgBF4) to sulfur of 6:1 (mol/mol), and reaction time of 16 hr, the desulfurization yield could reach 76.3%. [ABSTRACT FROM PUBLISHER]