Phase equilibria of (water–carboxylic acid–diethyl maleate) ternary liquid systems at 298.15 K

Liquid–liquid equilibrium (LLE) data for the ternary systems of (water–formic acid–diethyl maleate), (water–acetic acid–diethyl maleate), (water–propionic acid–diethyl maleate), (water–butyric acid–diethyl maleate), and (water–valeric acid–diethyl maleate) were investigated at 298.15 K and atmospheric pressure. Complete phase diagrams were obtained by determining solubility and the tie-line data. The tie-line data were compared with the results predicted by the UNIFAC and the modified UNIFAC (Dortmund) 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 selectivity were evaluated for the immiscibility region.