Liquid-Liquid equilibria of the water-acetic acid-butyl acetate system

Abstract

-Experimental liquid-liquid equilibria of the water-acetic acid-butyl acetate system were studied at temperatures of 298.15±0.20, 303.15±0.20 and 308.15±0.20 K. Complete phase diagrams were obtained by determining solubility and tie-line data. The reliability of the experimental tie-line data was ascertained by using the Othmer and Tobias correlation. The UNIFAC group contribution method was used to predict the observed ternary liquid-liquid equilibrium (LLE) data. It was found that UNIFAC group interaction parameters used for LLE did not provide a good prediction. Distribution coefficients and separation factors were evaluated for the immiscibility region.

Liquid–liquid equilibrium and critical states for the system acetic acid+n-butanol+n-butyl acetate+water at 308.15K

“…As usual the solubility increases with temperature and the area of immiscibility at 298.15 K [10] covers a larger area in comparison with 308.15 K (our data). There are some difference of our results and the data [6] at 308.15 K. As a whole the solubility in this ternary system slightly depends on temperature, including a critical region. Fig.…”

“…The paper [5] of Campanella and Mandagaran describes the influence of the simultaneous chemical and phase equilibrium on the conceptual design of reactive distillation processes in the esterification of acetic acid with methanol, ethanol and butanol. The LLE (solubility and tie-line data) was experimentally investigated in ternary system acetic acid-n-butyl acetate-water at 298.15, 303.15 and 308.15 K by _ Ince and _ Ismail Kõrbaşlar [6]. The UNIFAC method was used to predict the LLE and it was found that the used parameters do not give a good agreement.…”

Liquid - liquid equilibria of the water + butyric acid + decanol ternary system

“…Production of organic acids such as acetic, citric, lactic, propionic and butyric acids can be given as an example. Extraction can be employed not an only in downstream separation but also in combination with fermentation (Wardell and King, 1978;Hegazi, 1984;Fahim et al, 1992;Arce et al, 1995;Fahim and Al-Muhtaseb, 1996;Fahim et al, 1997;Sólimo et al, 1997;Colombo et al, 1999;Aljimaz et al, 2000;Taghikhani et al, 2001;Trevor et al, 2001;İnce and Kırbaşlar, 2002;İnce, 2005).…”

Liquid–liquid equilibrium of water+acetic acid+butyl butanoate at 298K and 1 atmosphere

“…The reliability of experimental and predicted tie-line data can be ascertained by Othmer-Tobias regression [9][10][11][12][13][14] equation which is given as,…”

“…The separation of acetic acid from its aqueous form is a challenging industrial problem [1][2][3] and many studies have been reported for the recovery of the acetic acid with different solvents [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. When acetic acid is to be recovered at very high concentration the solvent used has to exhibit almost negligible solubility for water besides satisfying the desired specific characteristics such as high distribution coefficient, high separation factor, good selectivity towards the given solute, and the general characteristics such as boiling point difference between the solvent and extractant, viscosity, density, interfacial tension, corrosiveness, flammability, toxicity, compatibility, availability, and cost [2,[4][5][6].…”