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

► LLE data of water-carboxylic acid-diethyl maleate 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. ► Diethyl maleate can be used as a adequate solvent for carboxylic acid extraction.