Generalizing Binary Solubility Data for Low-Volatile Liquids in Supercritical Fluids

EXISTING GENERALIZATION METHODS The key parameters that govern the feasibility of the separation of a mixture by supercritical fluid extraction are the binary solubilities of the components of the mixture in the extractant over a wide range of state variables. Several approaches to predicting the binary solubilities of liquids in compressed gases are known (1) where y i and y j are the concentrations (mole fractions) of the components; B ii is the second virial coefficient, which accounts for the interaction between identical molecules; B ij is the second virial cross coefficient, which accounts for the interaction between different molecules; and v m and z m are the molar volume and the compressibility of the gas phase, respectively. Within the framework of the thermodynamic similarity method, B ij is computed by various relations of the form where P cr and v cr are, respectively, the critical pressure and the critical molar volume of the component; is the characteristic temperature; and ω ij is the characteristic acentricity factor. There is a comprehensive review [2] of methods for calculating the characteristic cross parameters of mixtures, including higher order virial coefficients. ω ij is usually defined as the arithmetic mean of the acentricity factors of the mixture components. It was suggested [1] to calculate the characteristic temperature with the use of the empirical binary intermolecular interaction parameter k ij : ). = A generalized formula for k ij has been derived [1] for the interaction of organic liquids with a compressed gaseous solvent. The formula gives k ij as a function of the number of carbon atoms in the molecule of the dissolved liquid: where n is the number of carbon atoms in the molecules of dissolved n -paraffins, ketones, alcohols, and aromatic hydrocarbons. The interactions of nonpolar molecules with one another and of nonpolar molecules with polar molecules have been considered. The generalized formula is empirical, and the discrepancy between the parameters k ij obtained by experimental data processing and the generalized curve considerably exceeds the experimental error. The binary solubilities of low-volatile substances, including solids, have been represented [3] as a function of the solvent density: where y is the binary solubility (mole fraction), P is the pressure in the system, P 0 is the standard pressure, ρ is the solvent density, and ρ 0 is the standard solvent density. The parameters A and B are interrelated b

Material and technical base of the laboratory for the thermal destruction of production and consumption waste for the training of specialists in the field of waste management

© Published under licence by IOP Publishing Ltd. In this article, an analysis of the main thermal methods of waste utilization is carried out, a model laboratory for the thermal destruction of production and consumption wastes including medical was developed

USING OF 3D-MICROSCOPY IN MICROSURGERY

Work is executed at RFBR financial support, the project 15-29-04868

The design and investigation of fluorine- and silicon-substituted hydroxyapatite

This work is devoted to the design and investigation of fluorine - and silicon — substituted hydroxyapatite.Целью настоящей работы являлся направленный синтез высокодисперсного модифицированного ГАП с заданным составом и структурой и исследование физико­химических и медико-биологических характеристик полученных материалов

EFFICIENT WAY OF LARGE-SCALE PREPARATION OF SCANDIUM COMPOUNDS FROM WASTE OF ALUMINA PRODUCTION

Huge amounts of red mud for decades were stockpiled near the alumina refineries. The red mud can be considered as a non-conventional raw material source of rare metals, widely used in the production of materials for microelectronics, radio, nuclear power, etc

The effectiveness of pulsed magnitophoresis in the complex treatment of chronic generalized periodontitis with the use of compositions based on silicon-organic glycerohydrogel

The work outlines the main findings of the study the effectiveness of applying a new method of the treatment of chronic generalized periodontitis by means of pulsed magnitophoresis, developed drug composition based on silicone-organic glycerohydrogelВ работе изложены основные результаты исследования эффективности применения нового метода лечения хронического генерализованного пародонтита посредством проведения импульсного магнитофореза разработанной лекарственной композиции на основе кремнийорганического глицерогидрогеля

The necessity of development of ecologically friendly cultivation technologies of agricultural crops

The work deals with the principal factors, which should be taken into account during the development of cultivation technologies of agricultural crops, which increase soil fertility and yields of crops, and give biologically valuable ecologically friendly products. That’s why it’s necessary to study and select efficient bio drugs, fertilizers and technological methods of cultivation to increase productivity of agricultural crops. Soil treatment with the elements of agricultural biologization is of great importance. The use of ecologically friendly bio drugs is especially important for growing children and dietary food products; their use allows increasing quality and amount of medicinal raw material. The present agro technologies should save soil fertility, reduce and prevent soil degradation, take into account varietal features of field crops, agro climatic and soil conditions of the regio

DEVELOPMENT OF THE DESIGN SCHEME OF THE COMBUSTION CHAMBER FOR BURNING OF WOOD CHIPS THE OLD SLEEPERS

А calculation scheme for the utilization of chips of old wooden sleepers in a vortex furnace is proposed. The vortex furnace provides two zones of reaction of a combustible substance with air: the primary zone is the gasification of old sleepers and the afterburning of the solid residue with a lack of air oxygen, the secondary zone is the burning of the gas phase. The initial data for the thermodynamic calculation is given. The results of the equilibrium calculation of the thermal decomposition of wood on the grate and the combustion of gasification products are presented for different values of the excess air factor, as well as some experimental data. A comparison of the calculation results with the experimental data is carried out