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.
Highlights
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
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
Summary
ИССЛЕДОВАНИЕ РАЗЛИЧНЫХ ИЗОМНОГООБРАЗИЙ В ЧЕТЫРЕХКОМПОНЕНТНЫХ СИСТЕМАХ, СОДЕРЖАЩИХ БИАЗЕОТРОПНЫЕ БИНАРНЫЕ СОСТАВЛЯЮЩИЕ. В данной работе для оценки возможности разделения экстрактивной ректификацией трехкомпонентных смесей, содержащих биазеотропные составляющие, проведен анализ взаимного расположения ряда изомногообразий в концентрационных тетраэдрах, образованных компонентами разделяемой смеси и дополнительным веществом – экстрактивным агентом. В качестве объектов исследования выступают четырехкомпонентные системы, образованные базовыми системами бутилпропионат (БП) – пропионовая кислота (ПК) – бутилбутират (ББ), бутилпропионат – пропионовая кислота – масляная кислота (МК), бутилбутират – масляная кислота – бутилпропионат, бутилбутират – масляная кислота – пропионовая кислота, которые являются составляющими системы БП–ПК–ББ–МК, имеющей промышленное значение и содержащей биазеотропные составляющие БП–ПК [6,7,8], ББ–МК [6, 9] и моноазеотропную составляющую ПК–ББ [6], и экстрактивным агентом сульфоланом (СФ) [10]
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