Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The solid-liquid equilibria (SLE) for the ternary system of 2-methyl-1,4-naphthoquinone (2-MNQ) + phthalic anhydride (PA) + 1,4-dioxane were determined at temperatures (283.15, 293.15 and 303.15) K, respectively. The ternary phase diagram can provide the fundamental basis for the separation of 2-MNQ and PA. Three isothermal phase diagrams of the system were constructed on the basis of the measured solubility. Two pure solid phases were formed at (283.15, 293.15 and 303.15) K, including pure PA and pure 2-MNQ, which were confirmed and determined by Schreinemakers wet residue method. There are two solid phases formed in the phase diagram. The phase diagram at 283.15 K is similar to those at (293.15 and 303.15) K and the crystalline fields of 2-MNQ and PA decrease with increasing temperature. NRTL and Wilson model were used to correlate and calculate the solubility data for the ternary system. The NRTL model made a better agreement than those with Wilson model. The densities of equilibrium liquid phase were determined experimentally at the corresponding temperatures versus mass fraction of component.