Isothermal vapour–liquid equilibrium of binary systems containing polyoxyethylene dodecanoate and alcohols

Isothermal vapour–liquid equilibrium (VLE) data have been measured with a static method for three binary systems of polyoxyethylene dodecanoate {(POEDDA) + butan-2-ol} at T = (333.4 to 424.5) K, (POEDDA + tert-butanol) at (321.1 to 401.5) K, and (POEDDA + pentan-1-ol) at (340.2 to 419.4) K. Four feed compositions were studied over the concentration range of 0.099 to 0.432 of POEDDA mole fractions. The experimental results were fitted to the Antoine equation to regress the Antoine constants. These VLE data were further treated by using the Barker method to obtain the best fit of binary interaction parameters from the UNIQUAC, the NRTL, and the Flory–Huggins models. The results showed good agreement between the experimental and calculated values. The Flory–Huggins model yielded the best result with an overall average absolute relative deviation (AARD) of 2.1%. The solvent activities were also calculated and showed agree well with the calculated values from those three activity coefficient models.

► An autoclave apparatus was used to measure binary vapor-liquid equilibrium data.
► The studied systems are polyoxyethylene dodecanoate with 2-butanol, tert-butanol, and 1-pentanol.
► The saturated pressure data were fitted accurately to the Antoine equation.
► The UNIQUAC, the NRTL, and the Flory–Huggins models correlated well the phase equilibrium data.
► The solvent activities have been calculated.