Study On Desulphurization Technology Of Light Fuel Oil By A Catalytic Oxidation Method

With the development of science and technology, people pay more and more attention to the environment protection. The waste gas from automobile has been drawn widely and low sulfur content's standard of light fuel oil has been also formulated strictly. Traditional desulfurization technology exists some problems such as large investment of facilities, expensive operating-cost and drastic reaction conditions which made great rise in production cost of ultra-low sulfur light fuel oil and economically unbearable, therefore, the world is devoted to the development of new technologies. Above the non-hydrodesulfurization, oxidative desulfurization is considered one of promising processes for its mild reaction condition, simple equipment design and highly efficiency. Meanwhile,because of the simple preparation, the high catalytic activity and the environmental protection, heteropoly compound is widely used in the area of catalysis.In this paper, with self-made peroxy-phosphotungstic acid and supported its as catalyst, 30% hydrogen peroxide as oxidant,under no adding catalyst promoter and organic solvent, organic sulfur compounds were removaled from light simulation oil (model compounds such as benzothiophene(BT) and dibenzothiophene(DBT)), gasoline and diesel by a catalytic oxidation method. The reaction temperature, reaction time, the amount of catalyst and the ratio of hydrogen peroxide to oil were inspected. The extraction and catalyst carrier were screened. Reaction kinetics of oxidation of BT and DBT were studied preliminaryly.The results showed that the conversions of benzothiophene and dienzothiophene reached above 96.48% and 99.42% respectively, under the conditions of the amount of catalyst 0.48%, H2O2/Oil ratio being 1∶5 0, after 60 min, at temperature 60℃and the molar ratio of peroxy-phosphotungstic acid to surfactant being 1∶2 at atmospheric pressure; The conversions of benzothiophene and dienzothiophene reached above 96.55% and 99.64% respectively, under the conditions of the amount of supported catalyst 0.39%, H2O2/Oil ratio being 1∶40, after 60 min, at temperature 60℃, at atmospheric pressure; At atmospheric pressure, H2O2/Oil ratio being 1∶5, after 60 min, at temperature 60℃, the molar ratio of peroxy-phosphotungstic acid to surfactant being 1∶2, the amount of catalyst 3.90% and supported catalyst 2.94%, under above conditions, the conversion of gasoline reached 77.24% and 82.39% respectively; At atmospheric pressure, H2O2/Oil ratio being 1∶5, after 60 min, at temperature 60℃, the amount of catalyst 1.16% and supported catalyst 0.91%, under above conditions, the conversion of diesel reached 92.23% and 93.88% respectively.