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CHEMISTRY

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

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.

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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.

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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.

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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 %.

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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”.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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THE PREPARATION OF MULTIFUNCTIONAL USHLESS ADDITIVES TO LIBRICATING OILS

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

The investigations on the development of low waste process of the preparation of ash-less additives – sulfamides on the base of alkylphenolated rav material which exclude the formation of acidie hydrone and tar vhich are typical for manufacture of sulfonated additives.

The developed multifunctional additives are of great interest for creation of ashless and low ashless motor oils with the improved exploitat and ecoloyical properties.

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SYNTHESIS AND STUDY OF PHYSICO-CHEMICAL PROPERTIES OF COMPOSITIONS BASED ON ZINC OXIDE HYDROSOLS

Posted in 2021, CHEMISTRY, Issue №7 (109) July 2021 | 0 comments

In this article, zinc oxide hydrosols from various precursors are synthesized and their colloidal-chemical properties of the obtained dispersed systems are studied. The particle size of ZnO obtained from zinc nitrate amounts to 91 nm, while the size from zinc acetate equals 61 nm. The study determines that more stable hydrosols are obtained from zinc nitrate. The presence of zinc oxide is confirmed by infrared spectroscopy: the characteristic absorption bands are 455.22 and 439.78 cm-1. The authors introduce a method for obtaining compositions based on a hydrosol of zinc oxide and hyaluronic acid and study the rheological properties of the formed compounds. The dispersion medium is hyaluronic acid, while the dispersed phase is zinc oxide nanoparticles. The introduction of an inorganic matrix does not affect the viscosity properties of the organic component.

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S-CURVES AND ENTROPY CONDITIONS FOR STABLISATION OF SYSTEMS

Posted in 2021, CHEMISTRY, Issue №7 (109) July 2021 | 0 comments

S-curve graphs characterize the general dynamics of changes in entropy components depending on the main parameters of the process. At the same time, their sum is equal to the maximum value of each of them in this interaction. The condition of the stationary state of the system is the equality or constant value of its entropy and negentropy (equilibrium dynamics) ratio. Such patterns occur in many phenomena and in conformational interactions in physical chemistry, in nature, in technology, and even in economics. The study provides examples of their functional contribution. Based on Russian data, the study also demonstrates the possibility of an objective analysis of the course of the regional coronavirus scenario.

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AN ANALYSIS OF THE EFFECT OF ADSORPTION OF LONG-CHAIN SURFACTANTS ON THE CHANGE IN THE WATER CONTACT ANGLE OF SOLID SUPPORTS

Posted in 2021, CHEMISTRY, Issue №7 (109) July 2021 | 0 comments

The study determines the water contact angles of Ludox-HS40 grade silica (2%, wt.) modified with a cationic surfactant cetyltrimethylammonium bromide (10-7-10-1 mol/l) on a glass and aluminum support. The study compares the obtained data and draws conclusions about the effect of the adsorption of cationic surfactant on the surface of solid silica particles on the interfacial angle wetting of aluminum and glass support. It is shown that an increase in the concentration of surfactants added to the initial silica sol leads to an increase in the values of wetting the interfacial angles of solid particles and solid support, but only to certain values. A further increase in surfactants above the values corresponding to sol coagulation caused a decrease in the values of the interfacial angles. The material of the substrate used in the experiment is not observed to have a noticeable effect on the values of the measured angles of wetting.

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SOME ASPECTS OF THE INTERACTION OF GLASS BINDER COMPONENTS DURING HEAT TREATMENT ACCORDING TO THE GLASS PHASE CONTENT

Posted in 2021, CHEMISTRY, Issue №6 (108) June 2021 | 0 comments

This article presents generalized data on the synthesis of glass-crystalline materials based on flotation wastes. Optimal structures of glass-crystalline materials and technological parameters based on the composition Kaolin-quartz sand-flotowaste of the fluorite concentrator are developed. There have been determined the physico-chemical properties of glass-crystalline materials.
This work aims to study the production of glass-crystalline material at low synthesis temperatures (not exceeding 900oC).
The binder was studied for obtaining glass crystallite of the following chemical composition (%* – Hereinafter mass content):69,00 SiO2, 7,80 Al2O3, 1,56 Fe2O3, 3,65 CaO, 0,10 MgO, 0,15 BaO,12,70 Na2O, 1,70 K2O, 4,50 CaF2, 4,00 cryolite. At the same time, quartz sand was completely excluded from the factory composition and the amount of the glass crystallization initiator, cryolite, was significantly reduced. The production binder was also studied for comparison.

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SYNTHESIS OF STARCH ADIPATES AND INVESTIGATION OF THEIR RHEOLOGICAL PROPERTIES

Posted in 2021, CHEMISTRY, Issue №5 (107) May 2021 | 0 comments

The current article examines the regularities of obtaining starch esters with adipic acid and studies the rheological properties of the obtained starch adipates. In the course of the research, the author examines the kinetics of starch acylation with adipic acid in the presence of thionyl chloride and the kinetic regularities of the starch acylation process occurring in the topochemical process using the Erofeev-Kolmogorov equation. The energy parameters are determined using the Eyring and Arrhenius equations based on the obtained values of the velocity constants. The study also provides the parameters of the transition complex formed during the acylation of starch with adipic acid. The formation of starch esters was confirmed via IR spectroscopy.

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