Ternary liquid–liquid phase equilibria of (water–carboxylic acid–1-undecanol) systems at 298.15 K

Liquid–liquid equilibrium (LLE) data for the ternary systems of (water–formic acid–1-undecanol), (water–acetic acid–1-undecanol), (water–propionic acid–1-undecanol), (water–butyric acid–1-undecanol), and (water–valeric acid–1-undecanol) were investigated at 298.15 K and atmospheric pressure. Complete phase diagrams were obtained by determining solubility and tie-line data. The tie-line data were compared with the results predicted by the UNIFAC, modified UNIFAC (Dortmund), and modified UNIFAC (Lyngby) methods and correlated by means of UNIQUAC model. The reliability of the experimental tie-line data was confirmed by using the Othmer–Tobias correlation. Distribution coefficients and separation factor values were evaluated for the immiscibility region.

► LLE data of water–carboxylic acid–1-undecanol were presented at 298.15 K.
► Tie-line data were compared with data obtained from UNIFAC, mod. UNIFAC, UNIQUAC.
► Distribution coefficients were evaluated for the immiscibility region.
► 1-Undecanol can be used as an adequate solvent for carboxylic acid extraction.