Experimental and correlated tie-line data for aqueous mixtures of 2-butanol with 2-ethyl-1-hexanol at various temperatures

Liquid–liquid equilibrium data for the (water + 2-butanol + 2-ethyl-1-hexanol) ternary system were determined at T = (298.2, 308.2, 318.2, and 328.2) K in ambient pressure. This ternary system exhibits type-2 behavior of LLE. Distribution coefficients and separation factors were measured to evaluate the extracting capacity of the solvent. The consistency of the experimental tie-line data was determined through the Othmer–Tobias and Bachman equations. The raw experimental data were correlated using the nonrandom two-liquid (NRTL) model. The average root-mean-square deviation between the experimental and calculated mass fractions was 0.84%.

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► Phase equilibria of (water/2-butanol/2-ethyl-1-hexanol) system were measured.
► Experimental LLE data were correlated with NRTL model.
► Distribution coefficients and separation factors were evaluated for the system.