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Citrate complexes of transition metals, namely cobalt and molybdenum, used as active components in the synthesis of catalytic systems supported on alumina for hydrotreatment of heavy oil fractions have been studied. Cobalt nitrate hexahydrate and polyoxomolybdate (molybdenum blue) obtained by mechanical activation of molybdenum disulphide (MoS₂) powder were used as initial compounds. Thermogravimetric analysis of the samples was carried out during their heating from 25 to 750°C at a rate of 15°C/min in air. A study by thermogravimetric analysis shows that the order in which the active components are introduced significantly affects the thermal stability of the sample. Despite the general similarity of the profiles, a shift of the temperature range of citrate complex decomposition is observed, depending on the order of active components introduction. Presumably, this may be due to the different degrees of Mo and Co availability for the formation of compounds with citrate ligands. It is shown that the most thermally stable system is the one in which the Co-containing component and citric acid are introduced first, and then the alcohol solution of molybdenum blue; the least stable system is the reverse one, in which the alcohol solution of molybdenum blue is introduced first, then citric acid and the Co-containing component are added.

The composition and distribution of organic compounds in the bottom sediments of the Tom River near the city of Yurga (the Kemerovo Region - Kuzbass) in 1995, 2005 and 2018 are determined by gas chromatography - mass spectrometry. The compounds included hydrocarbons ( n -alkanes, isoalkanes, naphthenes, alkylbenzenes, and polycyclic aromatic hydrocarbons), oxygen-containing compounds (carboxylic acids and their ethyl and propyl esters). The data on the group composition of the most dangerous pollutants, polycyclic aromatic hydrocarbons, are presented. The pattern of changes in the technogenic load on the river system made by the Kuzbass enterprises over different years has been established. The highest contribution into the pollution of the Tom basin was determined to be in 2005. This contribution is directly due to the industrial activities at the enterprises of Kuzbass.

The process of removing sulphur-containing compounds from the diesel fraction has been carried out and investigated. The systems based on coordinating polar solvents (DMF and DMSO) and metal salts (CuCl₂, CoCl₂, MnCl₂, Mn(TFA)₂, Cu(TFA)₂) were used as extractants. It has been established that the presence of metal salts in extraction systems increases the degree of removal of sulphur-containing compounds from the diesel fraction from 11 to 49 % and reduces the content of polycyclic aromatic hydrocarbons by 33 %. It is assumed that the addition of metal salts to the solvent enhances its acceptor properties, which is manifested in the enhancement of its extractability.

The results of rheokinetic measurements of changes in the fluidity of gel-forming compositions of various natures obtained by the methods of rotational and selection viscometry are presented. A technique for processing measurement results obtained by means of vibrational viscometry in measuring vessels of different sizes has been developed. Two directions of the interpretation of nonmonotonic rheokinetic dependences are considered.

Investigation of the dispersed organic matter of the rocks at the Ust’-Maiskaya wildcat area was carried out. The data on the features of dispersed organic matter composition in the range of 2868.731 - 3057.68 m are presented. Alkanes, mono-, bi-, tri-, tetra- and pentacyclic arenes, bi-, tri-, tetra- and pentacyclanes, tetracyclic naphthenoaromatic hydrocarbons, dibenzothiophenes have been identified among hydrocarbons studied by means of gas chromatography - mass-spectrometry. Perylene and traces of nickel metalloporphyrins were also determined spectrophotometrically. It is shown that the initial organic matter was formed under the conditions of reduction and suboxidation, with a significant contribution from both the terrestrial vegetation and phytoplankton. The presence of nickel porphyrin and perylene complexes in some sections of the log suggests the shallowness of the sedimentation basin and the proximity of the coastline during the period of OM accumulation. The calculated vitrinite reflectance indicates that the differences observed for the MK₂ stage of catagenesis correspond to the main zone of oil generation.

The composition of cracking products of high-sulphur shale oil from the Kashpir deposit is investigated under different process conditions (duration and temperature). The characteristic features of the influence of heat treatment conditions on changes in the composition of liquid products of oil shale cracking are established. It is shown that the cracking of oil shale organic matter is accompanied by the formation of a wide range of low-molecular sulphur-containing compounds that enter the composition of oils. The changes in the group composition of sulphur-containing compounds of oils have been studied, the features of the distribution of thiophene derivatives, benzo- and dibenzothiophene derivatives in the composition of liquid cracking products are revealed. It is shown that the depth and rate of destruction of sulphur-containing structural fragments of kerogen is significantly affected by the temperature and duration of the process. The data obtained will improve understanding of the patterns of thermal transformations of sulphur-containing structural fragments of organic matter in high-sulphur oil shale during cracking.

Results of the application of benzene oxidation product (BOP), formed in barrier discharge, as an improving component of the inhibiting additive for paraffinic and highly paraffinic petroleum are presented. The proposed additive consists of a copolymer of alkyl acrylates with dodecylamine acrylate and BOP at a ratio of 15:1 wt. %. Benzene oxidation by air in a barrier discharge proceeds predominantly to phenol (~77.3 wt. %), diatomic phenols, and an insignificant amount of macromolecular compounds. The effect of the additive (in combination with BOP) in the amount of 0.03-0.05 wt. was evaluated relying on changes in the rheological characteristics and freezing point of paraffinic and highly paraffinic petroleum with a high content of resins and asphaltene components. The composition containing polymer and BOP additionally reduces the amount of asphaltene-resin-paraffin deposits by 1.5-2.5 g, which gives an increase in inhibitory capacity by 10-12 %. The depression of the freezing point of petroleum is 46 ºС on average. The dynamic viscosity of petroleum under study decreases in the presence of the additive by a factor of 2.2 on average.

A new multifunctional oil-displacing MIСA composition has been developed by the researchers of the IPC SB RAS for the purpose of oil recovery enhancement. The MIСA composition possesses oil-cleaning properties and is able to align the displacement front by increasing the reservoir sweep. Laboratory tests of MICA and its components (glycerol, carbamide, and boric acid) were carried out against the reservoir microflora of three groups: hydrocarbon-oxidising and denitrifying bacteria (HOB and DNB, respectively) as possible agents for enhanced oil recovery, and sulphate-reducing bacteria (SRB), as a corrosion-dangerous group. It is shown that HOB exhibited positive reactions to all versions of components introduction, as well as to the solutions of the composition diluted by a factor of 20-50. The presence of boric acid, in particular in the binary systems with carbamide and glycerol, suppressed the growth of DNB in spite of the stimulating action of glycerol and carbamide. The multifunctional MICA composition had a positive effect on the DNB count at 20-50 dilution. In the course of pilot work in 2020-2021 at the Usinskoye oilfield, a positive effect of the MICA composition on the growth of HOB and DNB groups and the inhibition of the SRB count was revealed. The effect decreased after 8-10 months due to manifold dilution of the composition and its displacement. This action of MICA and its components may be evaluated by two positive effects: an increase in the counts of HOB and DNB, as potential agents of oil displacement, and inhibition of the activity of SRB, as an agent of sulphide corrosion of equipment.

Changes in the composition of SARA fractions (Saturated, Aromatics, Resins, Asphaltenes) of methane crude oil from the Zyuzeevo oilfield (the Republic of Tatarstan) during thermal cracking are investigated. Cracking was carried out at 450 °C for 120 min in the isothermal mode. The data on mass balance, the composition of liquid and gaseous products of cracking were obtained. It is shown that the composition of hydrocarbons in liquid products and the yield of side gaseous and solid products depend on the composition of initial SARA fractions. Thus, the yield of solids is maximal from asphaltene fraction cracking, while the largest amount of gases are formed from resin fraction cracking. It has been established that cracking of SARA fractions involves the formation of new components that were absent in the initial feedstock. It is shown that the structural features of initial resin and asphaltene molecules affect the content and composition of their cracking products.

The state of the vegetation cover at six hydrocarbon fields of the Parabel district of the Tomsk Region has been studied relying on satellite data. An example of the practical application of the procedure developed for the quantitative assessment of the state of vegetation cover at oil-and-gas producing territories on the basis of the values of vegetation indices obtained using the satellite data MODIS (Moderate Resolution Imaging Spectroradiometer) is shown. It is established that changes in the values of vegetation index EVI (Enhanced Vegetation Index) over the 12-year period (2011-2022) have a positive trend, with the maximum values recorded in 2020. This may indicate the restoration of vegetation and improvement of the environmental situation.