Measurement and correlation of solubility of abietic acid in ethanol + water mixtures

• We measured the solubility of abietic acid in (ethanol + water) mixtures.
• We correlated the SLE data using the Wilson, NRTL and λh equations.
• We discussed the solution characteristics via the molar mixing enthalpy (HE).

Using a laser monitoring observation technique, the solubility of abietic acid in (ethanol + water) mixtures was measured by a dynamic method at atmospheric pressure. The solubility of abietic acid increased with an increase of temperature and the concentration of ethanol. Experimental solubility data were correlated by means of the Wilson, NRTL and λh equations utilizing parameters derived from the (solid + liquid) equilibrium (SLE) data. The results showed that the three equations are suitable for description of the solubility data of abietic acid in the (ethanol + water) mixtures investigated.