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The influence of bioethanol content and parameters of the cavitation field on the quality indicators of motor gasolines: volatility and octane number is studied. Studying the effect of bioethanol and cavitation treatment of bioethanol-gasoline mixture will make it possible to produce automotive fuels for different climatic zones, or winter (summer) versions of gasolines. The use of bioethanol and cavitation treatment of a bioethanol-gasoline mixture affect the fractional composition of motor gasoline and its volatility. The optimal content of the biocomponent, at which there is an increase in the volatility of gasoline, is established Also the results of the octane number change are presented depending on the intensity of cavitation treatment for gas condensate with the addition of bioethanol. The influence of bioethanol content on the increase in octane number during cavitation treatment is determined. It is found that the introduction of bioethanol into the composition of gasoline leads to an improvement in its volatility. In this case, cavitation treatment makes it possible to obtain a mixture resistant to delamination. The addition of bioethanol leads to an adequate increase in light fractions during mechanical mixing and to a change in the fractional composition of the bioethanol-gasoline mixture during cavitation treatment. The addition of bioethanol in amounts up to 10% leads to a decrease in the saturated vapor pressure during cavitation treatment of bioethanol-gasoline mixtures, and an increase in the bioethanol content up to 20% leads to an increase in the saturated vapor pressure, which is explained by a change in the chemical composition of fuel components in comparison with the mechanical method of preparing mixtures. By cavitation treatment it is possible to change the fractional composition, the pressure of saturated vapors and the volatility of bioethanol-gasoline mixtures, making cavitation a promising energy-saving process for the production of gasoline for various climatic conditions

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Today, the use of bioethanol as an alternative motor fuel is quite relevant. Bioethanol is generally used as an additive to traditional petroleum fuels. The addition of bioethanol has a positive effect on increasing the evaporation and detonation resistance of gasoline. However, the addition of bioethanol alone may not be sufficient to fully address these issues. This article presents the results of a study of the influence of bioethanol content and cavitation field parameters on the quality of gasoline: evaporation and octane number. To determine the effect of cavitation treatment of gasoline-ethanol mixture on the physical stability of the fuel and evaporation, the content of narrow fractions, the percentage of fractions in the fuel, and the saturated vapor pressure before and after cavitation were determined. The optimal content of the biocomponent, which increases the evaporation of gasoline, has been established. The results of the change of octane number depending on the intensity of cavitation treatment for gas condensate with the addition of bioethanol are also presented. The influence of bioethanol content on the increase of octane number during cavitation treatment was determined. It is shown that the production of blended fuels by compounding with the use of cavitation treatment allows to obtain a gasoline-reference mixture with significantly better evaporation characteristics, in particular in terms of fractional composition and saturated vapor pressure, compared to gasoline-ethanol mixtures obtained by conventional mechanical compounding. In addition, it was found that the use of cavitation treatment can increase the octane number of fuels. The introduc-tion of ethanol can further increase their octane number. Thus, the introduction of ethanol and the use of cavitation treatment has a synergistic effect on improving the anti-knock characteristics of gasoline.

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