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RESEARCH OF VARIOUS ISO-MANIFOLDS IN FOUR COMPONENT SYSTEMS CONTAINING BIAZEOTROPIC BINARY CONSTITUENTS

https://doi.org/10.32362/2410-6593-2018-13-1-45-54

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Abstract

In the present work, an analysis of the mutual arrangement of a number of iso-manifolds in the concentration tetrahedron formed by the components of the separated mixture and an additional substance, an extractive agent, was carried out to estimate the possibility of separating three-component mixtures containing biazeotropic constituents by extractive rectification. The objects of research were four-component systems formed by ternary constituents (butyl propionate (BP) - propionic acid (PA) - butyl butyrate (BB), butyl propionate - propionic acid - butyric acid (BA), butyl butyrate - butyric acid -butyl propionate, butyl butyrate - butyric acid -propionic acid) of the commercially important BP-PA-BB-BA system, and the extractive agent sulfolane. Using the results of the computational experiment based on mathematical model NRTL-HOC we obtained complete data on the vapor-liquid equilibrium in binary, three- and four-component systems. The structures of liquid-vapor phase diagrams were obtained, and thermodynamic-topological analysis of all four-component systems was carried out. The mutual arrangement in the concentration tetrahedron of manifolds of relative volatility (equal to 1) of the components, reflecting the evolution of pseudo-azeotropes in sections with a constant concentration of the extractive agent; pseudo-ideal manifolds along which the activity coefficients of the components of the base (separated) mixture are equal to each other; isothermo-isobaric manifolds generated by Bancroft points in binary azeotropic constituents were determined. We established that it is possible to separate the studied three-component mixtures by extractive rectification using sulfolane.

About the Authors

F. N. Bedretdinov
Moscow Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Engineer of the 1st category, Chair of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo Pr., Moscow 119571, Russia



T. V. Chelyuskina
Moscow Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Dr.Sc. (Eng.), Professor, Chair of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo Pr., Moscow 119571, Russia



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For citation:


Bedretdinov F.N., Chelyuskina T.V. RESEARCH OF VARIOUS ISO-MANIFOLDS IN FOUR COMPONENT SYSTEMS CONTAINING BIAZEOTROPIC BINARY CONSTITUENTS. Fine Chemical Technologies. 2018;13(1):45-54. (In Russ.) https://doi.org/10.32362/2410-6593-2018-13-1-45-54

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