Effect of the imposition of low-frequency mechanical oscillations on the extraction efficiency

Shitshatskij, Ju. I.; Nikel, Séverine; Budanov, A. V.; Vlasov, Yu. N.

doi:10.20914/2310-1202-2018-1-25-29

Cited by 4 publications

(3 citation statements)

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“…Кинетическая кривая, построенная в координатах С(τ), показывает изменение концентрации экстрагента во времени. В качестве экстрагента использовалась подсырная сыворотка, с целью извлечения целевых компонентов (белков) из сырья растительного происхождения -люпина, наложением низкочастотных механических колебаний [7].…”

Section: методыunclassified

Thermodynamics of phase equilibrium in solid-liquid and solid-gas systems

Shishatskii

Дерканосова

Tolstov

2021

Vestn. Voronež. gos. univ. inž. tehnol.

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The thermodynamic equilibrium of a two-phase system is described by the Gibbs equation, which includes state parameters. On the basis of the Gibbs equation and the combined equation of the first and second laws of thermodynamics, thermodynamic potentials are written: internal energy, enthalpy and Gibbs free energy. If the two phases are in equilibrium, then the temperatures, pressures and chemical potentials of these phases are equal to each other. Equalities express the conditions of thermal and mechanical equilibrium, as well as the condition for the absence of a driving force for the transfer of a component across the interface. For a two-phase system, the Gibbs-Duhem equation connects the volume and entropy of 1 mole of the mixture, the content of any component, expressed in mole fractions. Extraction from lupine particles with cheese whey (solid-liquid system) is considered. The driving force of the extraction process in the solid-liquid system is the difference between the concentration of the solvent at the surface of the solid C and its average concentration C0 in the bulk of the solution. The concentration at the interface is usually taken to be equal to the concentration of a saturated solution of Cn, since equilibrium is established rather quickly near the surface of a solid. Then the driving force of the process is expressed as Cn – C0. A curve for the extraction of extractives from lupine with cheese whey was plotted by superimposing low-frequency mechanical vibrations.

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Section: методыunclassified

Thermodynamics of phase equilibrium in solid-liquid and solid-gas systems

Shishatskii

Дерканосова

Tolstov

2021

Vestn. Voronež. gos. univ. inž. tehnol.

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“…Физический смысл заключается в том, что если плотности твердой и жидкой фаз количественно разнятся, то следует ожидать некоторого увеличения относительной скорости их движения, что приведет к увеличению коэффициента массопередачи. Интенсивности хаотического движения фаз не будут одинаковыми, равно как и коэффициенты турбулентной диффузии [5][6][7][8][9][10]. Из сказанного следует, что рассмотренный случай движения одиночной частицы в турбулентном потоке сложен и может быть решен только при достаточно серьёзных допущениях, сформулированных выше.…”

Section: ио протодьяконов записал его в виде [3]unclassified

Mathematical model of movement of a single spherical lupine particle in the extractor using low-frequency mechanical vibrations

Shitshatskii

Barbashin

Nikel

2018

Vestn. Voronež. gos. univ. inž. tehnol.

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In our case, the solid body is the raw material of plant origin-lupine, crushed into grits, and the extractant is the cheese whey. The turbulent situation in the apparatus was created by the imposition of low-frequency mechanical vibrations, which have a significant impact on the characteristics of hydro-mechanical, mass transfer and thermal processes. This feature must be taken into account in the calculation of the extraction apparatus. The basic assumptions for the solution of the problem are formulated. The equation of motion of a single particle, which is contained in a number of works (Sow, an introduction, Chen, Protodyakonov, etc.). It is true in the instant values of the parameters. A simpler equation describing the motion of the dispersed particle and time correlation tensors with their subsequent decomposition into the Fourier integral are written. Further, taking into account the definition of tensors, the dependences for the calculation of the intensity of the chaotic motion of continuous and dispersed phases are shown, and the final expression is obtained, showing the ratio of the intensities of the phases. The coefficient of turbulent diffusion of each phase is proportional to the intensity of the chaotic motion of the corresponding phase. Therefore, the written finite equation for the phase ratio allows to estimate the ratio of the turbulent diffusion coefficients of the liquid and dispersed phases in the extraction apparatus. In our case, the ratio of the density of Hg / Hg is 1.1. Since the density of lupine and cheese whey differ quantitatively, we should expect some increase in the relative velocity of the phases, which will increase the rate of mass transfer. The intensities of the phases chaotic motion will not be the same, as well as the coefficients of turbulent diffusion. Thus, the case of motion of a single particle in a turbulent flow is complex and can be solved only under sufficiently serious assumptions formulated below.

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“…There are various methods for intensifying the extraction process [1][2][3][4], for example, by superimposing low-frequency mechanical vibrations [5,6] or using electrophysical methods of exposure [7,8]. For oil extraction plants of the percolation type, operating on the principle of countercurrent organization of the streams structure, a known way to increase efficiency is to reduce the effect of reverse recirculation of the extractant due to material moving to the opposite direction.…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of the structure of liquid phase flows in extractors of multiple irrigation of the oil-containing material with an extractant

Tsebrenko

Derevenko

Sevryugina

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The analysis of the flows structure in extractors operating by the method of multiple irrigation of the oil-containing material with an extractant (extractive agent) has been carried out. The features of the mass transfer process are considered using experimental data on the equilibrium: in the system the oil-containing material is the extractant and the kinetics of the extraction of the oil-bearing material. Experimental data of the concentration of miscella at each stage of a belt extractor operating according to the method of multi-stage irrigation were obtained under production conditions. Based on the data obtained, a working line of the extraction process for this extractor (extraction unit) was constructed, which made it possible to substantiate the ways of improving the structure of the liquid phase flows in it. The improvement of the streams structure of the liquid phase of the belt extractors is carried out on the basis of mathematical modeling of the process of extracting oil from the oil-containing material. We take into account the effect of reverse recirculation of the extractant and the dynamics of moving the extractant in the solid phase in the zone of no irrigation. It is shown that it is possible to intensify the extraction process by organizing an additional injection of the extractant at the last stage of the extractor. A numerical experiment was carried out on the basis of the developed mathematical model, which takes into account the additional injection of the solvent. As a result, it was found that the proposed solution allows reducing the oil content of the meal to 0.8%.

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Effect of the imposition of low-frequency mechanical oscillations on the extraction efficiency

Cited by 4 publications

References 1 publication

Thermodynamics of phase equilibrium in solid-liquid and solid-gas systems

Thermodynamics of phase equilibrium in solid-liquid and solid-gas systems

Mathematical model of movement of a single spherical lupine particle in the extractor using low-frequency mechanical vibrations

Analysis and optimization of the structure of liquid phase flows in extractors of multiple irrigation of the oil-containing material with an extractant

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