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Fine Chemical Technologies

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Vol 7, No 2 (2012)
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CHEMISTRY AND TECHNOLOGY OF INORGANIC MATERIALS

3-14 179
Abstract
This paper briefly reviews some perspective methods of synthesis successfully used in recent years in inorganic chemistry. Emphasis is placed on spark plasma sintering, synthesis in flux metal and synthesis of nanoparticles and clusters in ionic liquids. Besides, the paper briefly discusses some other approaches to inorganic synthesis, the use of which is perspective in the near future.
15-20 41
Abstract
The synthesis and data of the study of new complexes of samarium bromides with carbamide, [Ho(Ur)4(H2O)4]Br3 (I), [Ho(Ur)6(H2O)2]Br3 (II) and [Ho(Ur)4Cl3] (III), by IR spectroscopy and X-ray diffraction analysis are presented. For these compounds, coordination with metal occurs through the oxygen atoms of the water and carbamide molecules. The coordination polyhedra for I and II are distorted tetragonal antiprisms. In III, we have found inner-sphere coordination of four carbamide molecules and three chloride ions (the coordination polyhedron is a pentagonal bipyramid). The coordination of four carbamide molecules in I-III does not change their planar structures, but in II two carbamide ligands are distorted. Many hydrogen bonds are observed in the structures of complexes I-III.

THEORETICAL BASES OF CHEMICAL TECHNOLOGY

21-25 57
Abstract
Two-stage encapsulation of lipophilic functional components was investigated. It consists of emulsion preparation stage and spray drying. Influence of 10 factors on quality parameters (encapsulation efficiency, output capacity and residual moisture content) was estimated. The major factors were identified and recommended for design of the technology.
26-30 44
Abstract
A technique for calculating a two-case vacuum-evaporating crystallization installation was considered. The first case of the installation it is used for concentrating the initial solution by its evaporation. The second case is used for evaporating crystallization. Thus, secondary steams of the evaporating device are used for crystallizer heating.
31-37 65
Abstract
Processes of heterogeneous extractive distillation and extractive distillation with heterogeneous binary mixtures were considered. Entrainers were chosen according to the thermodynamic criterion. The variation of pressure can be used for targeted changes in the relative volatility of the separated components in ternary systems.
38-42 60
Abstract
The article discusses the possibility of applying the approaches of the theory of the formal analogy of processes with structural transformation of the original system for studying the dynamics of emulsions formation by supersaturation with respect to the equilibrium concentrations in three-component solutions.
43-47 52
Abstract
This article is devoted to the development of a method for synthesizing heuristic techniques for conceptual designing of objects in different topical areas. The synthesis of specific heuristic techniques for conceptual designing of capacitive type chemical reactors with a stationary catalyst layer is considered.

CHEMISTRY AND TECHNOLOGY OF ORGANIC SUBSTANCES

48-50 48
Abstract
The possibility of increasing the amount of vacuum gasoil from oil distillation by preliminary oil mechanical activation was confirmed. The oil was bituminous type on the basis of GOST R51858-2002. However, overall increase of distillate fractions is less than 1% mass compared to their potential content.
51-57 65
Abstract
Tris(N-methyl)trimethylcyclotrisilazane (cyclosilazane-1) and tetra(N-methyl)tetramethylcyclotetrasilazane (cyclosilazane -2), that are promising preceramic monomers for the production of oxygen-proof materials based on silicon carbonitride and nitride by СVD and CVI, were obtained through methyldichlorosilane aminolysis, isolated and characterized by 1Н, 29Si NMR and gas-liquid chromatography. The conducted research resulted in the identification of factors effecting the reaction direction. According to solvent nature the reaction may be directed either towards cyclosilazane-1 formation or cyclosilazane-2 formation. In terms of efficiency, that is defined as cyclosilazane-1 to cyclosilazane-2 ratio, the solvents may be arranged in the following sequence: rubber solvent > rubber solvent + DE (diethyl ether) > nefras + DE > dichloromethane + DE > benzene.

CHEMISTRY AND TECHNOLOGY OF MEDICINAL COMPOUNDS AND BIOLOGICALLY ACTIVE SUBSTANCES

58-64 50
Abstract
A single-step HPLC method for the determination of fat-soluble vitamins and some additives in several liquid medicines by reverse phase in the isocratic mode was developed.
65-69 84
Abstract
Polymers containing fragments of benzyl alcohol and phenols were synthesized by chemical modification of homo- and copolymers of 4-vinylbenzylchloride-styrene. It was shown that these modified polymers inhibit the growth of test cultures of mold fungi.
70-74 74
Abstract
An indirect approach for the determination of enantiomeric purity of chiral α-(benzyl)-carboxyethyl- and γ-methyl-substituted monomers of polyamide nucleic acids mimics (PANAM) is described. The test consist in the synthesis of C-terminal diastereomers with methyl ester of L- or DL-isoleucine for each PANAM monomer and estimation of the relative content (abundance ratio) of main and minor diastereomers by means of reverse phase HPLC and 1H-NMR spectroscopy.

SYNTHESIS AND PROCESSING OF POLYMERS AND POLYMERIC COMPOSITES

75-79 48
Abstract
The influence of morphological characteristics of carbon black on the critical shear stress in its model dispersions in dibutyl phthalate was established. The possibility of forecasting the properties of a number of rubber mixtures and rubbers by means of the critical shear stress was shown.
80-83 39
Abstract
Specific features of the flow of filled and highly filled composites with a filler having monofractional structure (glass microspheres) on the basis of epoxy oligomers were investigated in two modes: at a constant shear rate and at a constant shear stress.
84-87 57
Abstract
The effect of molecular mass on adsorption of epoxy oligomers on water-toluene solution interfaces and a glass dispersed filler surface was investigated. Comparison of results (experimental and calculated on the basis of the theoretical adsorption model of) indicated that adsorption on the water-toluene interface was monomolecular. On the contrary, adsorption on the glass dispersed filler surface was polymolecular.
88-91 51
Abstract
The work focuses on investigating the influence of the processing additives on the filler dispersion and properties of the rubber compounds based on EPDM with carbon black and silica filler. It was found that these processing additives mainly change technological properties of the rubber mixes with a carbon black filler and essentially change both technological and physical-mechanical properties of the mixes with a silica filler. Besides, a combination of additives appeared to have stronger influence on the properties of the rubber compounds, especially with a carbon black filler.
92-95 46
Abstract
Colloid-chemical properties of cationic surfactants, as well as kinetic laws of polymerization of styrene in their presence were studied. Conditions of styrene polymerization providing stable polymeric suspensions with a high positive ζ-potential of particles were chosen.


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