Mohammad Amin Sobati - Department of chemical engineering, Iran University of Science and Technology (IUST), Tehran, Iran.
Asghar Molaei Dehkordi - Department of chemical and petroleum engineering, Sharif University of Technology (SUT), Tehran, Iran.
Mohammad Sharokhi - Department of chemical and petroleum engineering, Sharif University of Technology (SUT), Tehran, Iran.

Oxidative desulfurization (ODS) of untreated high sulfur gas oil produced by an Iranian refinery (Tehran, Iran) with total sulfur content of 7990 ppmw was carried out using hydrogen peroxide – formic acid oxidation system. The influences of various operating parameters including reactiontemperature, hydrogen peroxide/sulfur molar ratio (O/S), and formic acid/sulfur molar ratio(Acid/S) on the desulfurization of gas oil were investigated. The appropriate conditions were found to be the reaction temperature = 80 ºC, O/S = 5, and Acid/S = 30. The achieved desulfurization of the present ODS process under these appropriate conditions was found to be over 97%.

Desulfurization, Oxidation, Solvent extraction, gas oil