Liquid–Liquid Equilibrium for Ternary System n-Butanol + n-Hexane + Ethylene Glycol at 298.15–323.15 K

Abstract

The liquid–liquid equilibrium (LLE) experiments for n-butanol + n-hexane + ethylene glycol were carried out and LLE data were measured at 298.15, 303.15, 308.15, 313.15, and 323.15 K under atmospheric pressure. The analysis results of the effects of n-butanol content and temperature on extraction showed that high n-butanol content was not favorable for extraction, and temperature had little effect on extraction. Moreover, the NRTL and UNIQUAC models were applied to correlate the LLE data, and the correlated data indicated that the UNIQUAC model showed a better correlation performance.

Liquid–liquid equilibria of ternary mixtures of methanol + MEG + n‐C5, ethanol + MEG + n‐C5, and n‐butanol + MEG + n‐C5

“…The solubility of MEG in n-pentane increases as the alcohol chain increases. LLE data reported by Li et al [6] for the n-butanol + n-hexane + MEG system show that the solubility changed a little with the temperature in the range of 298.15-323.15 K. The same phenomenon was observed in this work. In all systems, as the alcohol chain increases, the immiscibility region decreases.…”

“…Table 2 and Figure 2 show the results of liquid–liquid equilibria of the ternary system 1‐butanol (1‐ButOH), n ‐hexane ( n ‐C6), and MEG at 298.15 K and 101.3 kPa, obtained in this work and from Li et al [ 6 ] The relative deviation (RD) was calculated according to the following equation: where is the global molar fraction of component i , obtained in this work, and is the molar fraction of component i from the literature.…”

“…The experimental scheme was validated using the ternary system, n ‐butanol + n ‐hexane + MEG, and the data are then compared to those from the literature. [ 6 ] A mean absolute error of 0.0023 mol fraction was obtained.…”

“…Table 2 and Figure 2 show the results of liquid-liquid equilibria of the ternary system 1-butanol (1-ButOH), nhexane (n-C6), and MEG at 298.15 K and 101.3 kPa, obtained in this work and from Li et al [6] The relative deviation (RD) was calculated according to the following equation:…”

“…For the binary mixture of MEG + n ‐pentane ( n ‐C5), there are only 19 data points related to infinite dilution activity coefficients, reported by González et al [ 3 ] and by Afzal et al [ 4 ] For systems containing MEG + alkanes, the solubility measurements made by Derawi et al [ 5 ] for binary mixtures formed by MEG + n ‐heptane/methyl‐cyclohexane/ n ‐hexane stand out. Li et al [ 6 ] studied the extraction of n ‐butanol from n ‐hexane using MEG for applications in the Fischer–Tropsch process. The authors performed measurements of experimental LLE points for the ternary system of n ‐butanol + n ‐hexane + MEG at 298.15, 303.15, 308.15, 313.15, and 323.15 K under atmospheric pressure.…”