Liquid–Liquid Equilibria for Systems of Ethanol + Octanol + Nonanol + Dodecane + Tridecane + Water at Different Temperatures under Atmospheric Pressure

Abstract

In this work, the suitability or potential of ethanol aqueous solutions as a solvent for the extraction of alcohols from alcohol–alkane mixtures was studied. Experimental liquid–liquid equilibria (LLE) data of four quaternary systems {ethanol (1) + octanol (2) + dodecane (4) + water (6)}, {ethanol (1) + octanol (2) + tridecane (5) + water (6)}, {ethanol (1) + nonanol (3) + dodecane (4) + water (6)}, and {ethanol (1) + nonanol (3) + tridecane (5) + water (6)} were determined at T of 293.15, 298.15, and 303.15 K under atmospheric pressure. The nonrandom two-liquid model model was used to correlate binary interaction parameters. The parameters obtained from quaternary systems were used to predict six-component system LLE data. The predicted LLE data were in good agreement with the experimental data. The results showed that 75 wt % ethanol aqueous solution was suitable for separating octanol and nonanol from octanol + nonanol + dodecane + tridecane mixture and that 298.15 K was the suitable temperature.

Liquid–Liquid Equilibrium Data and Process Simulation for Separating the Mixture of Decanol + Undecanol + Tetradecane + Pentadecane

“…Based on the previous research results − of our laboratory, for the systems of butanol + octane + nonane, hexanol + heptanol + decane + undecane, and octanol + nonanol + dodecane + tridecane, higher alcohols can be extracted by aqueous ethanol solution effectively. However, there are also some alkanes in the extraction phase after extraction, which need to be back-extracted to purify the higher alcohols and increase the recovery of alkanes.…”

“…Liquid–liquid equilibrium (LLE) data is a prerequisite for extraction process simulation. However, there have been only a few studies − on the liquid–liquid equilibrium of alcohol–alkane mixtures; the LLE data for the system of ethanol (1) + decanol (2) + undecanol (3) + tetradecane (4) + pentadecane (5) + water (6) have not been reported.…”