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The process of degradation of biodiesel of vegetable origin (rapeseed and sunflower) under the influence of various factors is considered. Existing methods of determining microbiological contamination of substances are analyzed, their main advantages, disadvantages, and limits of use are determined. Based on the combination of existing methods, a method of qualitative and quantitative determination of the degree of microbiological (bacterial and mycological) damage to fuels has been developed.

The principle of device operation for determining the quality control of diesel fuel is considered, which helps to
investigate the spectral characteristics of diesel fuel. Basic wavelet transformations are given. IR spectroscopy of diesel fuel from
different producing countries was carried out, and determination of the cetane number through wavelet coefficients and determining
conclusion diesel fuel quality were performed.

The jet and diesel fuels production line has been simulated using the universal simulating program ChemCad. The choice of the rectification process calculation module was substantiated. The Grayson-Streed and Lee Kesler models were used for the calculation of the thermodynamic system and the phase equilibrium of the multicomponent mixture. The model of an oil mixture distillation unit for jet and diesel fuels production has been developed.

In the article the chemistry of the noncatalytic oxidative desulfurization process of distillate oil fractions is analyzed. The study involves the characteristics of high-sulfur straight-run diesel fraction of narrow composition (593–623 K) before and after oxidation by air at 453–493 K and a pressure of 3.0 MPa. The composition of sulfur compounds in the raw material fraction was determined. It is shown that straight-run fractions of raw materials may also contain sulfoxides, which are products of oxidation of organosulfur compounds and are formed during storage of petroleum products.

The article deals with the determination of hydrodynamic parameters necessary to conduct the desulfurization process of straight-run kerosene (SRKF) and straight-run diesel fractions (SRDF) via oxidation of sulfuric organic compounds, followed by the removal of oxidation products. The established parameters which are characterized by the linear rate of the oxidant (air) movement and the dummy contact time between the oxidant and the feedstock allow the process to be carried out without stirring.

Cyclohexane oxidation is object of this research. One of the most problematic points of this process is low conversion of raw material and low selectivities for aim-products at conversions higher than 4%. One of the reasons for this is absence of modern effective catalytic systems that could increase mentioned indexes. One of the directions of solving these problems is the creation of a technology for the integrated use of the obtained oxidation products on the basis of the developed new effective catalytic systems, which will enable to increase the selectivity of the process.

In this research biodiesel is produced from goat tallow in the presence of homogenous catalysts such as KOH and NaOH using trans-esterification process. For this purpose, effect of several parameters such as temperature, reaction time, methanol to oil ratio, type and concentration of a catalyst has been investigated. The results showed that the maximum biodiesel yield (96 and 98 %) was obtained using NaOH and KOH, respectively, and optimal conditions were determined.