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CHEMISTRY

ISSN 2227-6017 (ONLINE), ISSN 2303-9868 (PRINT), DOI: 10.18454/IRJ.2227-6017
ПИ № ФС 77 - 51217

PHYSICAL, CHEMICAL AND ADSORPTION PROPERTIES OF GAIZE AND ITS USAGE IN WASTE WATER TREATMENT

Posted in 2017, CHEMISTRY, Issue № 6(60) June 2017 | 0 comments

The influence of waste water treatment of UNPK “Pishchevik” on the natural sorbent – gaize and microorganisms immobilized on this sorbent (from “Baikal EM1” EM-preparation) was studied. The calcination of disperse silica – gaize, which changes the adsorption properties of this sorbent was performed. The comparison of the purification efficiency of the initial gaize and gaize-carrier of microorganisms of the EM-preparation “Baikal EM1” was made. Physical and chemical methods of waste water treatment (determination of pH, ammonium ions, nitrogen-containing substances, fats) were studied as well.

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OBTAINING INDIVIDUAL 3D IMPLANTS FOR BONE PLASTICS ON THE BASIS OF MATERIALS FROM CALCIUM MAGNESIUM PHOSPHATE

Posted in 2017, CHEMISTRY, Issue № 4(58) April 2017 | 0 comments

Dicalcium phosphate dihydrate, bioresorbable calcium phosphate, is of great interest to researchers due to the development of a regenerative approach in the treatment of bone tissue. Magnesium-containing cements have a very positive effect on cellular activity and the improvement of strength characteristics in the pre-pressing of the cement paste. The aim of this paper is to obtain a magnesium-containing reaction bonded material based on brushite and newberyite. The regularities of the influence of magnesium amount in the precursor and the pressing pressure on the strength characteristics of the final product are established. The method for obtaining individual implants made with the help of 3D modeling for bone tissue restoration is proposed.

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PHYSICAL AND CHEMICAL JUSTIFICATION FOR FLAME ARRESTERS SELECTION

Posted in 2017, CHEMISTRY, Issue № 4(58) April 2017 | 0 comments

The article considers the basic physical and chemical principles of flame arresters selection; based on the flame chilling theory, it provides some calculations and guidelines on flame arresters efficiency improvement. The article also describes the parameters of chemical formulation of fuel combination for determination of flame arresters technical data. The article shows the importance of blast overpressure calculations and a maximum normal flame speed of combustible mixtures for the determination of flame arresters reliability.

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MAIN FEATURES OF QUANTUM PROPERTIES OF OXIDE MELTS

Posted in 2017, CHEMISTRY, Issue № 4(58) April 2017 | 0 comments

The quantum properties of boron oxide melts are considered in the paper. The research has shown that substances with zero entropy have quantum properties, such as superfluidity, two-fluid structure, quantum funnels forming. In this paper, we consider the main features of the quantum properties of oxide melts. The discovery of a new class of superfluid materials allows to perform fundamental research in the field of superconductivity and anomalous thermal conductivity.

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A NOVEL TECHNOLOGY FOR PRODUCING OF [18F]FLUMAZENIL, RADIOPHARMACEUTICAL FOR BRAIN RECEPTORS STUDIES BY PET

Posted in 2017, CHEMISTRY, Issue № 4(58) April 2017 | 0 comments

For the first time an express method of solid phase extraction (SPE) was proposed for producing of [18F]flumazenil ([18F]FMZ), a radioligand for visualization GABAA receptors by positron emission tomography (PET). Efficiencies of [18F]FMZ extraction by SPE on commercially available cartridges and by traditional semi-preparative HPLC were compared. Application of novel radiochemical automated technology allowed to obtain 2-5 clinical doses of radioligand in one production run (53 minutes). [18F]FMZ was produced with specific activity >185 GBq/µM, radiochemical purity >98 % and ≤ 4 µg/ml of nitromazenil residual amounts. The obtained preparation meets all Pharmacopoeia requirements and can be recommended for PET clinical applications.

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APPROACHES TO TECHNOLOGICAL SIMULATION OF FLOTATORS FOR WATER TREATMENT

Posted in 2017, CHEMISTRY, Issue № 3(57) March 2017 | 0 comments

Flotation treatment processes of natural and waste water are universal as for the extraction of pollutants causing the vast area of their application. At that the development of flotators is performed based on the analogous-empirical basis, and that makes it difficult to implement the flotation process with maximum efficiency. The main goal of this work is to determine the approaches to the technical modeling of flotation cells and flotation process in them. Consideration of hydrodynamic factors in relation to the physical-chemical interactions in the flotation cell is a new basis for the modeling of the flotation water treatment process, the further improvement of devices and improvement of the efficiency of the contaminant flotation process. The main of them are: the hydrodynamics of the flotation cell, the formation of flotocomplexes, the movement of flotocomplexes, the processes in the foam layer. Solution of the problem of technological simulation of flotators allows to design the construction of flotation cells, providing a favorable hydrodynamic conditions for movement of flotocomplexes, as well as to select the optimal conditions for conducting water cleaning flotation process during operation.

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CHEMICAL REACTION AS REALIZATION OF CHEMICAL MOTION FORM: HISTORICAL CONTEXT PROBLEMS

Posted in 2017, CHEMISTRY, Issue № 2(56) February 2017 | 0 comments

During the time the representation of chemical reaction as realization of chemical form of motion of matter was seriously suffered by the transformation of representations of atoms and molecules. Refusing the pure speculation and turning to the experimental observations, the scientists have received a conclusion, that a chemical form of motion properly is an electronic interaction of atoms and molecules. This interpretation makes it possible to explain the mechanism of a chemical reaction, to demonstrate the kinetics of chemical process and self-organization of macromolecules, to plan the complex organic synthesis, to carry out the quantum-chemical calculations. So, modern chemistry in the practical part purchased from hi-tech character.

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EFFECTIVENESS OF METHYLDIETHANOLAMINE THROUGH AMINE GAS PURFICATION

Posted in 2017, CHEMISTRY, Issue № 2(56) February 2017 | 0 comments

Amine gas cleaning has been widely used in the oil and gas industry. Traditionally, aqueous solutions of monoethanolamine are used for the treatment of diesel fuel from the hydrogen sulfide, carbon dioxide and mercaptans. The process is based on the chemisorption of acid gas components by aqueous amine solution and on its further regeneration. Process optimization is possible through the use of methyldiethanolamine and depends on the real technological problem.
In this paper the technological features and benefits of methyldiethanolamine (MDEA) in the diesel fuel hydro treatment are studied. The studies were hold at the company “LUKOIL -Volgogradneftepererabotka”.

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INVESTIGATION OF ACID AND CATALYTIC PROPERTIES OF MODIFIED WITH LANTHANUM OXIDE MFI-TYPE ZEOLITES IN THE PROCESS OF HIGH-OCTANE GASOLINE GENERATION

Posted in 2017, CHEMISTRY, Issue № 2(56) February 2017 | 0 comments

In present article the influence of lanthanum oxide promoting additives concentration on acid and catalytic properties of high-silica MFI-type zeolite in the process of conversion of straight-run gasoline fractions of gas condensate into high octane components of motor fuels is investigated. It was shown that introduction of lanthanum oxide promoting additives into zeolite increases its acid properties and catalytic activity. The maximal effect is reached by introduction 3 wt.% of lanthanum oxide into high-silica MFI-type zeolite.

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BEHAVIOR OF SINGLE DROPLETS IN LIQUID EXTRACTION SYSTEMS

Posted in 2017, CHEMISTRY, Issue № 2(56) February 2017 | 0 comments

The knowledge of drop rates has a big impotence to compute different processes of chemical technology, in particular, extraction processes. In industry extraction system is the complex polidisperse system. The first step to know these systems is to consider the behavior of a single drop. An experimental study of drop rise velocities was carried out in the system butyl acetate / water and benzene / water. A large effort has been made to prevent the system from contaminations. Typical regimes of droplet movement were shown in dependence of drop sizes. Correlations from the literature show excellent agreement with experiments.

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EFFECTS OF CUT-OUT ION VOLUME AND OVERSCREENING OF DIELECTRIC FUNCTION OF THE SOLVENT IN THE NONLOCAL ELECTROSTATICS SOLVATION THEORY

Posted in 2016, CHEMISTRY, Issue November 2016 | 0 comments

The article considers the development of nonlocal electrostatic theory of ion solvation in the case when taken into account the effect of cut-out the ion volume from solvent and the overscreening of dielectric function of solvent. The calculated energy of ion solvation in this model is compared with the calculation on theory (J. Chem. Phys., 1996), which does not take into account this effect. The theory developed explains the difference in solvation energies of alkali metal cations and anions of halogens of the same radius.

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THE SYNTHESIS OF NEW ORGANOSELENIUM COMPOUNDS BASED ON CATECHOL AND SELENIUM

Posted in 2017, CHEMISTRY, Issue № 1(55) January 2017 | 0 comments

Convenient method for preparation of 2-(allyloxy)phenol from catechol and allylbromide permitting to obtain the product in high purity has been developed. The reaction of selenium dibromide with 2-(allyloxy)phenol leading to the formation of linear Markovnikov product, bis[2-bromo-3-(2-hydroxyphenoxy)propyl]selenide in 97% yield has been studied. The action of a base (K2CO3) on this compound led to a number of products including the target compound bis(2,3-dihydro-1,4-benzodioxin-2-ylmethyl)selenide – the result of intramolecular substitution with the formation of two 2,3-dihydro-1,4-benzodioxine cycles. The major product is 2-(allyloxy)phenol as a result of elimination of selenium dibromide from bis[2-bromo-3-(2-hydroxyphenoxy)propyl]selenide.

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PURIFICATION OF WATER FROM DIESEL FUEL

Posted in 2016, CHEMISTRY, Issue December 2016 | 0 comments

The conditions for efficient separation of dissolved diesel fuel using an ionic surfactant – sodium dodecyl sulfate and gelatine solution were determined. Reduction of dissolved hydrocarbons correlates with a decrease in the interfacial tension at the interface of the aqueous solution / diesel fuel and is determined by the weight ratio of gelatine and surfactant. Most steady foam, containing a diesel fuel, is got from the solution of 2 ·10-3 mol/l SLS +0,1% gelatine. The maximal (on 91, 3%) decline of cut-in diesel fuel was looked after at the use of foam of the indicated composition.

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STABILITY OF LITHIUM-CONDUCTING POLYMER ELECTROLYTES VERSUS AQUEOUS SOLUTIONS OF ACIDS AND ALKALIS

Posted in 2016, CHEMISTRY, Issue October 2016 | 0 comments

The article considers data of stability of lithium-conducting polymer films based on fluoropolymer F-62 and lithium perchlorate as ionogenic salt versus aqueous solutions of acids and alkalis – hydrochloric acid and lithium hydroxide in pH range 1÷13. Both chemical composition change and conductivity shifts of samples are investigated under exposure in water solutions. The research is aimed to estimate the applicability of polymer electrolytes as lithium metal protection from water in lithium-air power sources.

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ABOUT TWO GENERATIONS OF AN ACTIVE FURNACE BRANDS CARBON BLACK FOR ELASTOMERS AND PLASTICS

Posted in 2016, CHEMISTRY, Issue August 2016 | 0 comments

The analysis of features of the stove technology and structure, strengthening properties and prospects of application of smooth and macroporosity series of brands of active техуглерода is Given. Influence of structuralness and macroporosity of carbon black is investigational on a structure and properties of standard rubber mixtures. Influence of strengthening of vulcanizing group is investigational on a structure and properties of compositions with the critical filling with NR smooth and macroporosity carbon black.

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DEFINITION OF QUALITY OF ESSENTIAL OILS

Posted in 2016, CHEMISTRY, Issue July 2016 | 0 comments

Essential oils have many beneficial properties, so are in great demand in the international market. Many manufacturers go to lengths to increase the production of the final product. The problem of falsification of today is particularly relevant. Use of counterfeit essential oils adversely affects the health. Today’s society is experiencing an unprecedented surge of interest in alternative and traditional medicine. The value of essential oils increases when worsens psychological atmosphere, the ecological situation and geomagnetic conditions.

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SORPTION OF RARE EARTH ELEMENTS FROM SULFURIC ACID MEDIUMS IN THE PROCESSING OF PHOSPHOGYPSUM

Posted in 2016, CHEMISTRY, Issue July 2016 | 0 comments

The method of sorption extraction of lanthanides in the course of vitriolic processing phosphogypsum. Cation exchange resin KU-2 is used as sorbent. Influence of contact time, pH and phase ratio on the ion exchange process is investigated. It is established that sorption from technological solutions at pH = 0.5 optimally conduct during 1.5-2 hours at the ratio of liq:sol is not more than 5:1. Under these conditions, the degree of extraction of rare-earth metals is 77.9%. The way of intensification of the extraction process, which consists in combining stages phosphogypsum leaching and sorption, is investigated.

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ABOUT ROLE OF CARBON BLACK IN THE CHANGES OF STRUCTURE WITH STRETCHING OF CHEMICAL NETS NR

Posted in 2016, CHEMISTRY, Issue June 2016 | 0 comments

The influence of carbon content on the anomalies of conditional equilibrium module and change the shape of the stress-strain curves of nets. The influence of structure of carbon black and the concentration of active circuits on the properties of nets with critical content, make the rubber in loose plastic. The influence of the technical architecture of the particularities of the serial and makroporistyh stamps on strength and conductive properties of rubber.

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THEORY OF K+/ Na+ SELECTIVITY IN WATER CAVITY OF K+ CHANNEL FOR THE POLE MODELS OF DIELECTRIC FUNCTIONS OF THE SOLVENT

Posted in 2016, CHEMISTRY, Issue June 2016 | 0 comments

The article considers the use of nonlocal-electrostatic theory of ion solvation to the calculation of K+/Na+ selectivity in the central cavity of K+ channel. It is shown that by increasing the correlation length of the water in the cavity is three times as compared with its value in free solution the magnitude of K+/Na+ selectivity is two for the calculation on the two-pole model of the dielectric function of the solvent. Considering the difference of concentrations K+ and Na+ inside the cell follows from this, that the proportion of K+ channels, in the cavity of which penetrate the cations Na+, at least an order of magnitude smaller than the number of channels available for the transport of K+.

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article retracted: DIAGNOSTIC KITS FOR PCR

Posted in 2016, CHEMISTRY, Issue June 2016 | 0 comments

Polymerase chain reaction (PCR) method to determine the presence of the foreign DNA in the blood, which is an important diagnostic method for many infectious diseases. The high sensitivity of this method is complicated by his conduct, since there is always a risk to contaminate the test material and laboratory glassware other infectious agents that causes to carry out research in conditions close to sterile. Described diagnostic kits for PCR – diagnosis.

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