Experimental study on the calorimetric data of cyclohexanol with alkanols (C1–C4) and correlation with the Wilson, NRTL and UNIQUAC models at T = 300 K

Excess molar enthalpies, HmE for the binary mixtures of cyclohexanol with methanol, ethanol, propan-1-ol, propan-2-ol, butan-1-ol and butan-2-ol have been calculated from calorimetric data at T = 300 K and atmospheric pressure. Calorimetric measurements were performed with a Parr 1455 solution calorimeter. All the binary mixtures show endothermic behaviour over the entire range of compositions. The HmE values become more positive with increasing the steric factors. With increasing the chain length of the alkanols, the HmE values become less positive. The maximum HmE values were observed about 0.4–0.6 mole fraction of cyclohexanol. The results were interpreted on the basis of the polarity, size and shape of alkanols. The experimental data were correlated by the Redlich–Kister equation and three thermodynamics models (Wilson, NRTL and UNIQUAC).

► Excess molar enthalpies of cyclohexanol + alcohols were calculated at 300 K. ► The HmE values were positive. ► The results were correlated with Redlich–Kister equation and Wilson, NRTL and UNIQUAC models.