Mixed diesel fuel with additive sesame oil esters for diesel engines

Currently, the issue of expanding the raw material base to increase the production of diesel fuels and improve their environmental performance is a relevant and important area. One of the types of raw materials for the production of alternative types of biofuels for diesel engines are vegetable oils. The use of bioadditives can reduce the emission of harmful substances compared to the use of petroleum diesel fuels. In this article, the features of using diesel fuels with the addition of mixtures of methyl esters of sesame oil in diesel engines are studied for the first time. Mixtures of fatty acid esters of sesame oil were obtained by direct transesterification of sesame oil with methyl alcohol at a temperature of 80-90 °C in the presence of potassium hydroxide. The results of the study established for the first time that the addition of sesame oil and methyl esters synthesized on its basis as additional components of diesel fuel in the amount of 3 and 5% by weight, respectively, improves the cetane number of diesel fuel by up to 7 points, as well as reduces emissions of harmful substances with exhaust gases by 25% rel. Some weight gain of the fuel is observed ‒ the values of density, kinematic viscosity, concentration of actual resins and iodine number increase. It is shown that the production of diesel fuel with the addition of mixtures of methyl esters of sesame oil allows to significantly expand resources and obtain diesel fuels with improved environmental characteristics. Keywords: diesel fuel; sesame oil; sesame oil esters; environmental characteristics.