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

The binary solid-liquid equilibrium of Dimethyl Terephthalate （DMT）, Dimethyl lsophthalate （DMI） and Dimeth- yl Phthalate （DMP） was investigated by experiment and differential scanning calorimetry （DSC）. The result demonstrated 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.

Experimental investigation of eutectic point in Al-rich Al-La, Al-Ce, Al-Pr and Al-Nd systems

In order to confirm the eutectic composition, eutectic temperature and phases of Al-rich Al-RE（La, Ce, Pr, Nd） binary systems, the eutectic Al-RE alloys with the controversial compositions were investigated. The scanning electron microscopy/energy dispersive spectroscopy（SEM/EDS）, differential scanning calorimetric（DSC） and cooling curve tests analysis indicated that a similar eutectic composition（~12 wt.% RE） on the Al-rich region was observed in the Al-La, Al-Ce, Al-Pr and Al-Nd alloys, and the eutectic structure of the alloys was consisted of α-Al and α-Al11RE3 phases by combining with X-ray diffraction（XRD） tests. In addition, the eutectic temperatures determined by DSC and cooling curve tests were very close and around 645 oC.