Solid-liquid equilibrium of dimethyl terephthalate(DMT),dimethyl isophthalate(DMI)and dimethyl phthalate(DMP)in melt crystallization process

摘要

The binary solid-liquid equilibrium of Dimethyl Terephthalate(DMT),Dimethyl Isophthalate(DMI)and Dimeth-yl Phthalate(DMP)was investigated by experiment and differential scanning calorimetry(DSC).The result dem-onstrated DMT/DMI and DMT/DMP systems are eutectic while DMI/DMP is a solid-solution system.The eutectic temperature of DMT/DMI system is 336.7 K and that of DMT/DMP is 271.1 K.Furthermore,a classical solid-liquid phase equilibrium model was used to fit the experimental data of the eutectic systems of DMT/DMI and DMT/DMP and the theoretical model could describe the eutectic solid-liquid phase diagrams properly.