Binodal varieties of the systems with four-component azeotrope

Фролкова, А. К.; Akishina, A. A.; Фролкова, А. К.

doi:10.1134/s004057951601005x

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…Для разработки энерго-и ресурсосберегающих технологических схем получения органических продуктов необходима информация о фазовом поведении систем. Работы, посвященные развитию фундаментальной теории фазовых равновесий для систем, включающих несколько компонентов, представлены только в отдельных публикациях [1][2][3][4][5][6][7]. В то же время имеющаяся база данных о физико-химических свойствах расслаивающихся систем с химическими реакциями достаточно ограничена [8][9][10][11][12][13].…”

Section: Introductionunclassified

Chemical Equilibrium in the Propionic Acid - Ethanol - Ethyl Propionate - Water System and Extraction Processes With Participation of Deep Eutectic Solvents

et al. 2019

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New experimental data on the chemical equilibrium in the propionic acid - ethanol - ethyl propionate - water system at 293.15 K and atmospheric pressure are presented. Chemically equilibrium compositions corresponding to the liquid-liquid equilibrium were obtained by gas chromatographic analysis. Using the method of nuclear magnetic resonance, homogeneous chemically equilibrium compositions were determined and the concentration equilibrium constant is calculated. The surface of chemical equilibrium and the region of splitting chemically equilibrium compositions are represented in the square of the transformed concentration variables. Comparison of the data obtained in the work with the literature was carried out at 303.15 and 313.15 K. It was found that the region of such compositions decreases with increasing temperature, while the surface of chemical equilibrium does not change the shape and position in the concentration space in the temperature range 293.15-313.15 K and atmospheric pressure. Liquid-liquid equilibrium compositions have also been obtained by gas chromatographic analysis for ethanol and ethyl propionate in the pseudo-ternary system using deep eutectic solvents (DES) based on choline chloride and glycerol / urea in whole range of concentration. The analysis of the extraction properties of DES showed the highest efficiency of DES based on choline chloride and urea. Experimental data on phase equilibrium are processed using Othmer-Tobias and Hand models. The calculated correlation coefficient (more than 0.99) indicates a high internal consistency of the experimental data obtained in this work.

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Section: Introductionunclassified

Chemical Equilibrium in the Propionic Acid - Ethanol - Ethyl Propionate - Water System and Extraction Processes With Participation of Deep Eutectic Solvents

et al. 2019

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The Relationship Between the Structure of Phase Equilibrium Diagram and the Structure of Flowsheet Diagrams of Multiphase Quaternary Mixtures Separation

Sebyakin

Фролкова

2016

Fine Chem. Tech.

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In this work the structures of phase equilibrium diagrams of multiphase four-component systems n-hexane (n-heptane, n-octane) - cyclohexane - furfural - water were investigated. The systems are characterized by the existence of areas of three-phase separation. On the basis of the obtained data the synthesis of feasible variants of separation schemes was carried out, rational modes of functioning of each column were found, the energetically favorable variant was chosen. It was found that the use of preliminary phase separation in systems with n-hexane and n-octane is power-efficient, and the profit in case of the octane system (equimolar mixture) in comparison with the application of the first predetermined separation at the first stage is more than 25%. Certain difficulties (the high values of columns effectiveness: 60 and 40 theoretical plates) upon the separation of the hexane and heptane systems are due to the similar volatilities of n-hexane (n-heptane) and cyclohexane in the vicinity of the point of pure alkane.

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The Strategy of Studying Three-Liquid Phase Equilibria in the Concentration Space of Quaternary Mixtures

Себякин

Фролкова

2016

Fine Chem. Tech.

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When separating multicomponent heterogeneous mixtures in units consisting of a distillation column and a decanter, a fundamental question is the location of phase separation regions with different numbers of liquid phases in the concentration simplex. A solution of this issue is based on data on the vapor-liquid and liquid-liquid equilibria of the mixture and its components, as well as on the general laws of the formation of the topological structure of phase separation areas. A strategy of studying the three-liquid phase equilibrium area in quaternary mixtures is proposed. The strategy is based on the formula of a topological invariant of the separation region and on the mathematical concept of centroid - the intersection point of three medians. The presence of threeliquid phase areas of separation of open and closed types is shown. They differ in the absence (presence) of region of degeneracy via the critical node.

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Binodal varieties of the systems with four-component azeotrope

Cited by 4 publications

References 6 publications

Chemical Equilibrium in the Propionic Acid - Ethanol - Ethyl Propionate - Water System and Extraction Processes With Participation of Deep Eutectic Solvents

Chemical Equilibrium in the Propionic Acid - Ethanol - Ethyl Propionate - Water System and Extraction Processes With Participation of Deep Eutectic Solvents

The Relationship Between the Structure of Phase Equilibrium Diagram and the Structure of Flowsheet Diagrams of Multiphase Quaternary Mixtures Separation

The Strategy of Studying Three-Liquid Phase Equilibria in the Concentration Space of Quaternary Mixtures

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