Fine Chemical Technologies

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Vol 5, No 3 (2010)
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3-9 83
Gas-liquid chromatography was used for estimating the selectivity of solvents for the separation of biazeotropic benzene - perfluorobenzene mixture based on extractive rectification.The selected optimal solvents enable two theoretically feasible variants of the mixture separation.
10-17 140
All the possible elements of the set of binary systems (ideal, zeotropic, mono-, bi-, triazeotropic, homo- and heterogeneous) were explored. The overall amount of the possible types of diagrams of binary systems was calculated.
18-25 141
Wilson and NRTL model parameters for binary components of ethanol-water-ethylenediamine and ethanol-water-butylamine systems were estimated. Besides, the mathematical simulation of vapor-liquid equilibrium in binary and ternary systems under atmospheric pressure was realized.
26-29 102
Both theoretical values of NMR 13С chemical shifts and frontier orbital energies (DFT method) for syn-[(1-R-η3-C3H4)Pd(Me2C=O)2]+ follow one- and two-parameter linear regressions which involve σ+ and σ- constants, as well as Swain-Lupton parameters R+, R- and F.


30-33 94
Data concerning the synthesis, IR-spectra, and single crystal X-ray studies for neodymium iodide and gadolinium iodide - thiourea complexes of the general composition [Ln(H2O)9]I3 · 2CS(NH2)2 (Ln = Nd, Gd) are presented. It has been demonstrated that in the solid state the title compounds are composed from [Ln(H2O)9]3+cations (polyhedron: monocapped tetragonal antiprism) as well as from non-coordinated thiourea molecules and iodide ions. Due to hydrogen bond formation mutually perpendicular flat molecules of thiourea are combined into goffered layers, nonaaquacations of lanthanides and iodide-ions being located in the cavities between these layers. The existence of hydrogen bonding between the mentioned species has been underlined.
34-40 85
The balance scheme of trichlorosilane production based on hydrochlorination of elemental silicon was worked out with the use of Microsoft Excel. The scheme includes the following steps: synthesis of hydrogen chloride, synthesis of trichlorosilane, separation of vapor-gas mixture and purification of trichlorosilane. If the user modifies the calculation conditions, the scheme allows to re-count automatically the material flows, specific consumption coefficients etc., and also to check the correspondence between the balance data obtained in the calculation process and required indices of production.
41-44 100
Chemical aspects of scandium solvent extraction from its chloride solutions at pH 3.0-4.5 by N-(2-hydroxy-5-nonylbenzyl)-β-hydroxyethylmethylamine solutions in octanol have been studied. The extraction mechanism has been suggested. The structure of the extracted complex has been identified by 1H NMR and IR spectroscopy methods.
45-49 96
The article is focused on the research of influence of various synthesis parameters (the rate of magnetite formation, iron salts mole ratio, nature and concentration of precipitator and process temperature) on the magnetic properties of magnetite nanoparticles.
50-56 91
The processes of complexing have been investigated for anodic dissolution of rhenium in a mixture of methanol and acetylacetone. A scheme of thermal decomposition of the obtained products has been suggested, and the temperature dependence of the phase composition of thermal decomposition products has been determined.
57-61 76
A method of optimization of new extractants' structure with the use of desirability function has been developed. The desirability function had been proposed before by Harrington for optimization of processes with several response functions. This method has been used for the design of phenolic type extractants.
62-68 102
The EXAFS/XANES, XRD, SEM methods were used for examination of freshly prepared low temperature carbon monoxide oxidation in air catalyst PdCl2-CuCl2/γ-Al2O3 active components states. The Cu2Cl(OH)3 phase with particle size 100-300 nm and tetrachloropalladat particles were identified on γ-Al2O3 surface. According to EXAFS data one of the palladium chloride bonds is longer then another ones. There is no direct interaction between palladium and copper, i.e. there is no common active center including palladium and copper on the γ-Al2O3 surface responsible on the low temperature carbon monoxide oxidation in air.


69-74 91
The article presents an optimized method for the determination of the ratio of 8-oxo-2'-deoxyguanosine (formed in DNA due to the action of active forms of oxygen) to 2'-deoxyguanosine. The ratio was determined by reverse phase HPLC combined with amperometric detection. It was shown that the ratio increases upon oxidative stress caused by the action of large doses of ascorbic acid in samples of DNA isolated from the liver of experimental rats.
75-76 70
The volatility of cobalt, nickel, and copper octaethylporphyrinates was studied by the Knudsen method. Thermodynamical characteristics of sublimation of these compounds were obtained.
77-78 82
It has been shown that spherical amorphous nanoparticles of lupane series triterpenoids at 0.835 mg/ml concentration adsorb 47 ÷ 62% of bilirubin when the content of the latter in blood plasma is 1.5 ÷ 12 times higher than normal.
79-81 105
The technology of obtaining high-purity taurine (2-aminoethanesulfonic acid) was investigated for the purpose of applying the technology on an industrial scale.


82-87 93
Styrene-divinylbenzene particles (6 microns in diameter) with carboxyl groups on the surface have been synthesized by seed polymerization in the presence of an organosilicon carboxyl-containing surfactant soluble in the monomer phase. It has been shown that carboxyl groups on the microsphere surface are accessible for covalent immobilization of bioligands and alanine-modified polyvinylpyrrolidone. It was supposed that applying modified polyvinylpyrrolidone for obtaining diagnostic systems based on polymer microspheres is very perspective.
88-91 104
The influence of solvent's chemical nature on the compatibility of styrene-acrylonitrile copolymer and polyurethane in solutions was investigated using data obtained from viscosity measurements.
92-96 80
The influence of poly(3-hydroxybutyrate) (10-20 weight %) on the expenditure and accumulation of chromophore groups was studied, as well as oxygen absorption upon photooxidation of a vinyl alcohol - vinyl acetate copolymer. The article suggests a kinetic model of the expenditure and accumulation of functional groups upon photooxidation of the mentioned copolymer and of blends based on it.
97-101 79
The influence of the elastomer nature on the properties of mixtures and of dynamic thermoplastic elastomers based on polyethylene was analyzed. It was shown that the nature of rubber affects the character of deformation and mechanical properties of materials. The dynamic thermoplastic elastomers based on 1,2-polybutadiene retain their properties upon artificial ageing and are more stable than those based on ethylenepropylenedienic rubber (EPDM).
102-107 125
The influence of molecular weight, molecular mass distribution, heterogeneity and low-molecular fraction content on the rheokinetics of epoxy resins DER-332, DER-330, ED-20, ED-16 cured with an amine-type hardener triethylenetetraamine was studied. Three characteristic stages of the epoxy oligomers curing were determined. The stages depend on the molecular characteristics of the oligomers.
108-110 82
It was considered the influence of the content of low concentrations of carbon nanotubes on physical and mechanical properties of epoxy composite. It was showed the extreme changes in the properties in a narrow range of concentrations of modifier.

ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)