Pages Navigation Menu
Submit scientific paper, scientific publications, International Research Journal | Meždunarodnyj naučno-issledovatel’skij žurnal

CHEMISTRY

ISSN 2227-6017 (ONLINE), ISSN 2303-9868 (PRINT), DOI: 10.18454/IRJ.2227-6017
ЭЛ № ФС 77 - 80772, 16+

FEATURES OF SOLVATION IN CONTACT SYSTEMS

Posted in 2021, CHEMISTRY, Issue № 11 (113) November 2021 | 0 comments

The article presents research in the field of solvation in contact systems. The variety of phenomena that can be observed in contact systems, including sorption-active materials and electrolyte solutions, indicates the possibility of a wide range of directional changes in the properties of such systems. This forms the basis for increasing the efficiency of their practical use and can also serve the purposes of developing new, unconventional technological processes and new methods for the study of substances.

Read More

STUDY OF GOLD-CONTAINING CONCENTRATE PROCESSING TECHNOLOGY

Posted in 2021, CHEMISTRY, Issue № 11 (113) November 2021 | 0 comments

The article deals with the processing technology of gold-containing concentrates in the gold extraction plant of the Vysochaishy deposit in the Bodaibo district of the Irkutsk region. The research of mineral samples of gold-containing concentrates was carried out. Recommendations for improving the efficiency of extraction of gold from the gold-containing concentrates at the gold-processing plant at the deposit «Vysochaishy» in the Irkutsk region are reviewed.

Read More

USING OF GAZ CHROMATOGRAPHY FOR DETERMINATION OF URINARY STONES NON-PROTEIN ORGANIC COMPONENTS AND THEIR DISTRIBUTION IN THEIR VOLUME

Posted in 2013, CHEMISTRY, Issue №6 (13) June 2013 | 0 comments

This paper shows the possibility of qualitative and quantitative (for a number of components) of the definition of non-protein organic component of urinary stones using in first time gas chromatography with flame ionization detector. The distribution of non-protein organic
component by stones volume has been submitted and their relationship with forms of urinary stones has been revealed.

Read More

INTEGRATION IN EXCEL WITHOUT MACROS ON THE EXAMPLE OF ARRHENIUS INTEGRAL

Posted in 2021, CHEMISTRY, Issue №10 (112) October 2021 | 0 comments

The article proposes an efficient (accurate, simple and intuitively clear, fast executable and having a short program code) algorithm based on the broad computing capabilities of Excel without using VBA macros. As an example, the implementation of the calculation of the Arrhenius integral in one Excel cell is given. The accuracy of the calculations is analyzed by comparison with the often-used approximations in chemical kinetics for calculating the integral for the range of values that occur during gas and solid-phase reactions. This algorithm can be used for the numerical integration of other nonelementary integrals encountered in solving practical problems and data processing. Illustrative examples (screenshots of a spreadsheet) contain comments and can be quickly reproduced and checked.

Read More

DETERMINING DIMETHYLAMINE IN WATER SOURCES OF VARIOUS GENESIS VIA HPLC

Posted in 2021, CHEMISTRY, Issue №10 (112) October 2021 | 0 comments

Based on the authors’ own previously published information, the article introduces a highly effective method for determining the concentration of secondary aliphatic amine – dimethylamine in water of various genesis. The method of liquid chromatography with a fluorometric detector, with preliminary derivatization of water samples, allows for determining dimethylamine in water with high selectivity, which was confirmed on model systems with the introduction of various concentrations of dimethylamine in the range from 0.005 to 0.1 mg/l. This fully meets the requirements imposed by the current regulatory documents of the Russian Federation. The method demonstrated high efficiency of ~ 97 %, with a total error of the method for measuring dimethylamine concentrations in water by high-performance liquid chromatography with FLD of no more than 25 %.

Read More

ADSORPTION OF DIMETHYLFORMAMIDE AND CAPROLACTAM BY ACTIVE CARBONS IN THEIR JOINT PRESENCE

Posted in 2021, CHEMISTRY, Issue №10 (112) October 2021 | 0 comments

The current article examines the adsorption process of dimethylformamide and caprolactam in their combined presence. As adsorbents, industrial activated carbons of the AG-OV-1, SKD-515 and AG-5 types (JSC “Sorbent”, Perm) were used, which differ in raw materials, the method of production, and adsorption properties. The main changes in the surface of activated carbons caused by the adsorption of dimethylformamide and caprolactam were determined via porometry and X-ray spectroscopy. The study establishes the features, regularities and mechanism of adsorption of dimethylformamide and caprolactam in their joint presence from aqueous solutions with industrial activated carbons. The presence of caprolactam in the dimethylformamide solution leads to a significant disturbance of the structure of the aqueous medium and significant changes in the adsorption isotherms. The AG-OV-1 sample demonstrates the highest adsorption activity in relation to dimethylformamide in the presence of caprolactam in the concentration range under study.

Read More

RELATIONSHIP OF PHYSICAL PROPERTIES WITH THE CRYSTALLOGRAPHIC PARAMETERS OF IONIC CRYSTALS

Posted in 2013, CHEMISTRY, Issue № 9(16) September 2013 | 0 comments

Obtained functional dependence of the Debye temperature for a number of spinels. The dependence of the relative molecular mass of the lattice parameter is satisfactorily described by a linear equation. Revealed a complex effect of crystallographic parameters of the density of a number of spinels.

Read More

CARBOXYLIC ACIDS AS COSOLVENTS FOR OIL- ETHANOL MIXTURE

Posted in 2013, CHEMISTRY, Issue № 9(16) September 2013 | 0 comments

To create the conditions for the intensification of biodiesel production from waste oil and ethanol, the possibility of homogenization of oil +ethanol mixtures is considered. The problem of determination of the phase composition of three- components systems TAG –CarbA -EtOH is solved, where TAG is triglycerides (sunflower oil), CarbA -carboxylic acid (butyric acid, stearic acid, oleic acid), EtOH -ethanol at temperatures ranging from 30 to 70oC. The ability of CarbA to act as a cosolvent for stratified phases such as TAG and EtOH is demonstrated. The efficiency action of CarbA as a cosolvents depending on their functiomal- grouping composition and molecular weight of hydrocarbon radicals is analyzed. A recommendations for choosing CarbA as a cosolvent for homogenization of the TAG +EtOH mixtures are formulated.

Read More

MASS SPECTROSCOPY OF ADDUCTS OF FREE RADICALS AND IMINOXYL RADICALS OF 6-HYDROXYPYRIMIDINE-4(3H)-ONES

Posted in 2021, CHEMISTRY, Issue №9 (111) September 2021 | 0 comments

The current article examines mass spectroscopy of electrospray ionization (ESI) and collision-induced dissociation (CID) of adducts formed by the interaction of free radicals of 2-substituted 6-hydroxypyrimidine-4(3H)-ones and iminoxyl radicals of 6-hydroxypyrimidine-4(3H)-ones. It is shown that they are characterized by the formation of single-charged mono -, di-and trimeric protonated and deprotonated ions of the form [n·M+H]+ and [n·M-H] -, where n=1-3. With negative ionization, the cleavage of the OH ·- radical is observed with the formation of [n·M-OH]- (n=1-3) ions. In the positive mode, hydration occurs with the formation of [n·M+H 3 O]+ ions (n=1-3). Fragmentation of adducts occurs by a single mechanism, the first stage of which is the cleavage of N-oxide oxygen in the form of hydroxyl radical followed by fragmentation of the dioxopyrimidine cycle, eventually leading to a bicyclic structure.

Read More

TECHNOLOGY FOR THE REGENERATION OF ACTIVE COALS AFTER THE ADSORPTION OF ORGANIC CONTAMINANTS

Posted in 2021, CHEMISTRY, Issue №9 (111) September 2021 | 0 comments

The problem of wastewater treatment of the coal industry has not been fundamentally solved in any country, since there is no opportunity to offer and work out a single and universal scheme for wastewater treatment, even for those enterprises that work with similar types of extracted coal and use similar technologies. It is advisable to use adsorption methods to purify quarry waters from organic compounds. During operation, the efficiency of filters with sorbing materials decreases, therefore their periodic regeneration is necessary to restore the adsorption capacity of active coals. Based on experimental studies, the article introduces a technology for restoring the sorption capacity of sorbents SKD-515, AG-3, KAU, AG-OV-1 after adsorption of trilene by heating for 2 hours with airflow at a temperature of 150 °C. Regeneration using this method restores the sorption capacity of active coals by 92-96 %.

Read More

DEVELOPMENT OF A METHOD FOR UTILIZATION OF WASTE GAS HYDROCHLORIC ACID AND HYDROGEN CHLORIDE

Posted in 2021, CHEMISTRY, Issue №9 (111) September 2021 | 0 comments

The current study discusses the direct chlorination of the aromatic core, i.e. m-cresol in an electrochemical system (graphite cathode, anode (ORTA)) in a CCl4 solvent medium with generated chlorine during the electrolysis of waste gas hydrochloric acid obtained as a by-product in chemical production. The authors of the study establish the optimal mode of the chlorination process in the electrochemical system: HCl concentration of 15-30%, the current density of 10-15 A /dm2, temperature of 60-700C providing the current output of 4-chloro 3-methyl phenol and 4,6-dichloro 3-methyl phenol, respectively, 95%. The chlorination process meets the requirements of “green chemistry”.

Read More

AN INVESTIGATION OF THE PRODUCTION OF CELLULOSE ADIPINATES FROM WOOD AND ITS SUBSEQUENT PRODUCTS

Posted in 2021, CHEMISTRY, Issue №8 (110) August 2021 | 0 comments

The market of bioplastics and dietary supplements is certainly promising and has been undergoing rapid development. In this regard, the issue of developing the technology for obtaining bioplastics by modifying cellulose and cellulose–lignin-containing waste can be considered relevant. The article examines the regularities of obtaining cellulose esters with adipic acid. In the course of the research, cellulose esters with adipic acid were obtained in the presence of thionyl chloride from wood raw materials with a degree of substitution of 2. The formation of cellulose esters was confirmed via IR spectroscopy. The synthesized cellulose adipates were later used to produce composites based on lignin and higher carboxylic acids. During high-temperature pressure treatment, the composition is chemically modified to form a thermoplastic material.

Read More

RESEARCH OF PROCESSES OF DETERMINATION OF GOLD CONTENT IN PRODUCTS OF GOK “NEVSKY” LLC “DRUZA”

Posted in 2021, CHEMISTRY, Issue №8 (110) August 2021 | 0 comments

The article deals with the processes of determining the gold content in the products of the “Nevsky” mining and processing plant of “Druza” LLC. The activity of AAL to determine the content of gold in gold-containing products was investigated. The composition and structure of AAL GOK “Nevsky” LLC “Druza” is considered. The paper describes methods for determination of gold such as atomic absorption, titrimetric analysis and gravimetric method. The principles of internal and external laboratory control in the AAL of a gold mining company are defined.

Read More

CHEMICAL BOND AND STRENGTH OF SOLIDS

Posted in 2013, CHEMISTRY, Issue October 2013 | 0 comments

Shows that the strength properties of solid body are connected with the energy of the chemical bond. Theoretical strength is many times higher than the technological strength. This is for non-metallic materials of nature, containing nepolârnye covalent bonds.

Read More

RARE-EARTH METALS AND THEIR PERSPECTIVE IMPORTANCE IN THE INDUSTRY OF KAZAKHSTAN

Posted in 2013, CHEMISTRY, Issue October 2013 | 0 comments

This article is devoted to production and application of rare-earth elements in our republic, the country where meets all elements from Mendeleyev’s table. This some kind of offer to be enriched, using natural stocks of Kazakhstan.

Read More

RESEARCH OF TREATMENT PROCESS OF WELL WATER WITH A HIGH CONCENTRATION OF MANGANESE AND IRON

Posted in 2013, CHEMISTRY, Issue October 2013 | 0 comments

In article we present the experimental results on demanganation of well water where the manganese concentration exceeds 5 mg/l and iron concentration – 20 mg/l. The developed technology for demanganation is described. The results of experiments at water treatment plant of Komsomolsk-on-Amur are presented.

Read More

MECHANOCHEMICAL ACTIVATION OF PHOSPHORITIES OF CHILISAY AND KARATAU (KAZAKHSTAN)

Posted in 2013, CHEMISTRY, Issue October 2013 | 0 comments

This research provides results regarding the modification of the natural phosphates of Karatau and Chilisay (Kazakhstan) with inorganic salts, such as NaHSO4 and NaH2PO4. The modification of these phosphates takes place in a planetary mill, which produces the necessary fertilizer and inorganic materials. The content of P2O5 in fertilizer has been increased after mechanochemical activation.

Read More

ZINK-DIOLIGOALKYLTHIOFOSPHINATE ON THE BASE OF COOLIGOMER OF HEXENE-1 WITH STYRENE

Posted in 2013, CHEMISTRY, Issue October 2013 | 0 comments

In article are given the results of synthesis and investigations of Zink salt of dioliqoalkylthiophosphine asid on the base of cooligomer of hexene-1 with styrene as polyfunctional polymeric additives, having additional anti-wear characteristics.

Read More

SINTHESIS OF MACROCYCLIC COMPOUNDS ON THE BASIS OF INDANDIONE-1,3

Posted in 2013, CHEMISTRY, Issue October 2013 | 0 comments

For the first are received arilendiamine and macrocyclic connections with fragments indandione-1,3, 1,4-naftalendiamine and it sulfasids. The synthesized compounds are characterized by means of electronic, infra-red spectroscopy and data of the element analysis. Individuality of compounds is confirmed thinlayer by a chromatography.

Read More

INVESTIGATE SYSTEM TO DETECT LEAKAGE AND PIPELINES ACTIVITY CONTROL

Posted in 2013, CHEMISTRY, Issue October 2013 | 0 comments

The article covers the problem of monitoring the pipelines system.

The article considers the possibility of continuous monitoring the innovative system to detect leakage and pipelines activity control, in order to reduce the risk of accidents with environmental consequences as a result of disasters at geographically distributed objects.

Read More