Application of a ternary phase diagram to the liquid-liquid extraction of ethanoic acid using ethyl ethanoate

Aline Amaral Madeira

doi:10.26850/1678-4618eqj.v44.3.2019.p43-49

Abstract

This article was elaborated in an approach to the liquid-liquid equilibrium of the extraction process of ethanoic acid (C2H4O2) in aqueous phase using ethyl ethanoate as solvent. The liquid-liquid extraction was modeled by the construction of a ternary phase diagram for the water-ethanoic acid- ethyl ethanoate system with the aid of the Origin software. The equilibrium data were obtained experimentally by titration at room temperature (298.15 K) and atmospheric pressure (101325 Pa) using four mixtures of water, ethanoic acid, and ethyl ethanoate. The determination of the composition of the extract and residue portions in the equilibrium of each mixture by of the tie-lines method allowed to examine the percentages of liquid-liquid extraction achieved. The distribution coefficients and separation factors calculated made it possible an evaluation of the distribution and of the mutual solubility of the solute in the aqueous and organic phases. The results showed a good performance of ethyl ethanoate in the extraction of ethanoic acid for concentrations of solute until 16% of the feed.

Highlights

Ethanoic acid (C2H4O2) is one of the most widely used and important carboxylic acids in the world
This article describes the liquid-liquid equilibrium of the extraction process of ethanoic acid (C2H4O2) in aqueous phase using ethyl ethanoate as the solvent
The liquid-liquid extraction was modeled by the construction of a ternary phase diagram for the water/ethanoic acid/ethyl ethanoate system using the Origin software

Summary

Introduction

Ethanoic acid (C2H4O2) is one of the most widely used and important carboxylic acids in the world. The separation of the mixture of ethanoic acid and water is of great economic importance but is difficult because it forms a pinch azeotrope. It is not a real azeotropic mixture, but the equilibrium concentrations of its constituents are very close and requires many stages. For mixtures with concentrations below 40% ethanoic acid, the liquid-liquid extraction process is the most appropriate[1]

Methods

Results

Conclusion