Home – Home – Jornals – Chemistry for Sustainable Development 2020 number 4

The high cost of hydrocatalytic processes is the reason of the attention of researchers to the search for alternative ways to process high-sulphur vacuum distillates. Pre-oxidation followed by cracking is considered as a promising method for refining petroleum products. This approach enables efficient destruction of polyaromatic sulphur-containing compounds in heavy hydrocarbon raw materials yielding additional amounts of distillate fractions. The effect of nano-sized molybdenum powder on the composition and quality of the products of cracking of vacuum gasoil oxidized preliminarily with a mixture of hydrogen peroxide with formic acid was investigated. It was demonstrated that the use of an optimal amount of nanosized molybdenum powder as the additive allows a substantial decrease in gas generation due to a decrease in the rates of aromatization and dealkylation of the oxidized high-molecular compounds including sulphur-containing ones. The effect of the amount of Mo additive on the transformation patterns of such sulphur-containing compounds as thiophene, benzo- and dibenzothiophene during the combined process was revealed. The changes in the structural-group parameters of resins and asphaltenes in the products of cracking of oxidized vacuum gasoil in the presence of the additive in different amounts were investigated. The data obtained allow us to extend our understanding of thermal transformations of the oxidized components of vacuum gasoil, which is an important step in the development of a technological scheme for processing high-sulphur gasoils relying on the combination of preliminary oxidation and cracking.