Effect of water content and storage conditions on the activity of carbon fiber supported palladium-copper-iron containing catalyst was studied. Physical-chemical properties of catalytic system were examined by means of XRD, XPS, SEM and GCh. The optimal water content in the catalyst, which ensures the most effective air purification both at low (0,03 vol.%) and high (0,5 vol.%) CO concentrations in the air and high humidity (70 %) of gas mixture, was determined.

Activity loss of the catalytic system after storage under air conditions (1 month) was attributed to the accumulation of the excess amount of water in the catalyst and reorganization of its the active phase – decrease in the palladium content in the near-surface layer and segregation of the Сu2Cl(OH)3 atacamite phase. Catalyst drying in air at 110 оС leads to its complete reactivation. Hermetically sealed freshly as-prepared and dried at 50 оС after experiment samples retain the initial catalytic activity during long-term (more than a year) storage.

The process of potassium sulfate crystallization from aqueous solutions in the presence of organic modifiers containing phosphonic, phosphate, sulfonic, sulfate and carboxyl functional groups has been studied. It is shown that the introduction of organic substances has an inhibitory effect on the formation of potassium sulfate crystals. Modifiers containing sulfonic, sulfate and phosphonic functional groups have the greatest inhibitory effect. The effectiveness of modifiers containing carboxyl groups is significantly lower. The formation of stable supersaturated solutions of potassium sulfate is achieved by introducing organic modifiers in an amount of 0.25 – 0.50%.

A simple, fast, sensitive method for the determination of preservatives (methyl parahydroxybenzoate, propyl parahydroxybenzoate) in the finished dosage form of sodium oxybutyrate syrup based on the simultaneous determination of preservatives using high performance liquid chromatography (HPLC) is proposed. The HPLC method was validated. The correlation coefficient of the linearity of the technique was 0.999 in the application range of 80–120 % of the normalized value. The calibration graph is linear in the region of 0.495–0.990 mg/ml of methyl 4-hydroxybenzoate and 0.165–0.330 mg/ml of propyl 4-hydroxybenzoate. It has been established that the analytical characteristics of the test procedure (selectivity, linearity, correctness, repeatability, reproducibility) satisfy the selected acceptance criteria.

For the first time, a method has been developed for the synthesis of aromatic imides of citraconopimaric acid by the interaction of primary aromatic amines (aniline, p-toluidine) and citraconopimaric acid in p-xylene at reflux. New aliphatic imides have been synthesized by the reaction of citraconopimaric acid and primary aliphatic amines (octyl-, octadecylamine) in a melt at 125–150°C. For the first time, the synthesis of citraconopimaric acid imidoamides was developed by treating citraconopimaric acid N-octylimide with thionyl chloride and subsequent reaction of the resulting acid chloride with primary aromatic amines (aniline, p-bromoaniline). A method has been developed for the synthesis of aliphatic imides of the rosin-citraconic adduct (in the form of technical products) by its interaction with primary aliphatic amines (octyl- and octadecylamine) at 180–200°C for 8–12 hours.

Together with Belarusian state technological university, the relationship between the structure of imides of rosin-citraconic adducts as modifiers of unfilled and filled industrial rubber compounds was studied, and the obtained additives were found to improve the technological properties of compositions while maintaining, and in some cases improving physical and mechanical parameters (increasing the resistance of compositions to thermal aging, bond strength of the cord with rubber, etc.).

The activity of Rivaroxaban as a representative of oxazolidinone series in relation to β-ketoacyl[ACP]synthase I has been studied in silico. Using the molecular docking methods, the binding sites of Rivaroxaban with protein have been identified. For the site providing the highest affinity of Rivaroxaban with protein (-10.26 kcal/mol), 4 clusters characterized by a number of runs greater than 15 have been analyzed. It was found that the specific position of the ligand within these clusters can be changed via mechanism providing a physiological response. Slight changes in the characteristics of the environment can lead to a transition from an energetically dominant position (BE = –10.26 kcal/mol) with predominantly hydrophobic interactions to another position (BE = –8.88 kcal/mol) with predominantly hydrophilic interactions. Dynamic transition discussed may cause a physiological response. The results of the study with a high degree of probability confirm the implementation of a specific mechanism of antimycobacterial action of Rivaroxaban through inhibition of the mycolate biosynthesis.

The results of the study of cesium, strontium, cobalt radionuclides sorption from model solutions simulating liquid radioactive waste on promising sorbents based on thermally modified oil shale are presented. The dependency of texture parameters obtained from the results of nitrogen adsorption-desorption on the treatment method of oil shale and their relationship to sorption parameters such as distribution coefficient and removal efficiency was discussed. Understanding how pore characteristics affect the sorption activity of such complex systems as sorbents is important for the creation of radionuclide sorption materials with improved characteristics. The efficiency of sorption of cesium, strontium and cobalt radionuclides was rather high for sorbent samples: the distribution coefficient was about 103–104 ml/g with a removal efficiency of more than 66 %. The most effective sorbent was obtained from oil shale with a heating rate of 5 deg/min without subsequent steam treatment, which is recommended to be used for low-active radioactive waste treatment.

Currently, to obtain light polymer composite materials with high strength characteristics, hollow microspheres of various nature (glass, quartz, polymer, etc.) are used as fillers. Hollow glass microspheres of different grades (manufactured by JSC «SIO Stekloplastik») were studied by various methods, the disperse structure was described using the generalized parameters model, the light dispersion-filled polymer composite materials (DFPCM) were classified according to the structural principle, generalized and reduced parameters were calculated, and the structure, compositions of light CMs on polymer matrices of various nature were designed.

The influence of the sizing agent and filler on the physical-mechanical and surface properties of paper from the cellulose mass of the inner layer of the bark of mulberry tree branches has been studied. According to standard methods, the mechanical strength and absorbency were studied. Surface absorbency for one-side wetting was determined by the method of Cobb(30), by determining the mass of water absorbed by the paper surface when wetting one side of the test sample. It was found that it is advisable to add a sizing agent in the range from 1 to 1.5 g per 100 g of dry cellulose raw materials, since an increase in the additive to 2 g helps to reduce the interfiber bonding forces by 21 %. The addition of 6 g of kaolin affects the distance between the fibers, which reduces the mechanical adhesive forces by 12.5 %. During the analysis of the surface properties of paper samples, the sizing efficiency was found to be from 22.5 to 30 % with an increase in the addition of sizing glue, which can be explained by densification of the structure, which prevents the penetration of aqueous solutions. The addition of 2 to 6 g of kaolin also increases water resistance from 17.5 to 25 %. With the help of a mathematical model, rational values of absorbency were revealed with a composition of 92 %, with a sizing agent of 1.5 g and an amount of filler of 4 g. The resulting mathematical model can be used as the basis for controlling the surface characteristics of paper during its production.

Higher heating value (HHV) on a dry and ash free basis (daf) is a convenient platform for comparing the energy content in various types of agricultural biomass. HHV and ash content for 90 samples of straw, seed, husk, meal, its waste, etc. were experimentally determined. HHVdaf for 80 samples from different regions were calculated by the literature data. The basic value of HHVdaf agricultural biomass at 19.6 MJ kg–1 was recommended for verifying data on solid biofuels. The intervals of variation of HHVdaf for sugar beet pulp, straw, meal, flax shives and sunflower husk are established. The deviations from the base value of HHVdaf and from intervals of variation of HHVdaf for certain types of agricultural biomass are discussed.