Oxidative Desulfurization of Naphtha with Hydrogen Peroxide in Presence of Acid Catalyst in Naphtha/Acetic Acid Biphasic System

Abstract

Oxidative desulfurization of naphtha with H2O2 in the presence of H2SO4 in the naphtha/acetic acid (AcOH) biphasic system was investigated. All organosulfur compounds examined were smoothly oxidized in AcOH by peracetic acid effectively formed from AcOH and H2O2 in the presence of H2SO4. The order of the oxidation reactivities was sulfides, disulfides benzothiophenes thiophenes. The organosulfur compounds in octane were also oxidized with H2O2 in the presence of H2SO4 in the octane/AcOH biphasic system. The oxidation proceeded in the AcOH phase and most of the oxidized sulfur compounds resided in this phase, resulting in the successive removal of the sulfur compounds from the octane phase. This oxidative treatment effectively reduced the sulfur content of naphtha, and adsorption with silica gel further reduced the sulfur content to below 0.5 mass ppm. In addition, hydrodesulfurization is an effective pretreatment for this oxidative desulfurization of naphtha, resulting in further reduction of the sulfur content to below 0.1 mass ppm.

Prediction of the pH-rate profile for dimethyl sulfide oxidation by hydrogen peroxide: The role of elusive H3 O2 + Ion

“…The main source of sulfur in the troposphere are oceanic phytoplankton, which continuously emit dimethyl sulfide (DMS), (CH 3 ) 2 S, releasing approximately 5 × 10 13 g of sulfur per year . Another important sulfur source in the atmosphere comes from the combustion of sulfur compounds that are present in fossil fuels . The study of reactions involving organosulfur compounds is of great importance considering that some of them, such as oxidation of sulfides to sulfoxides, are present in various chemical and biological processes like synthesis of biologically active molecules, formation of acid rain, and oxidative desulfurization .…”

Mathematical Model, Simulation and Scale up of Batch Reactor Used in Oxidative Desulfurization of Kerosene

“…These compounds are undesirable in petroleum fractions because they poison the catalyst in refinery and cause corrosion problems of internal combustion engines, also can emit SO 2 in the combustion process [1,2]. Due to these disadvantages, many techniques have been developed for sulfur removal [3].…”

“…One of these techniques is the oxidative desulfurization (ODS) process which receives more attention because it operates under low operation conditions and doesn't consume hydrogen compared with hydrodesulfurization (HDS) [3]. Thus, the ODS process was studied by a lot of researchers using different catalysts and oxidants under different operating conditions and for different petroleum fractions [1][2][3][4][5][6]. Despite this experimental study, the simulation process and modeling become necessary because they provide a better understanding of the process [7].…”