本研究利用熱分析儀測量水－氯化鉀和水－氯化鎂之液化溫度以及共晶點溫度。液化溫度對組成之變化圖與文獻值物合。其中水－氯化鉀和水－氯化鎂之共晶組成分別為-11.1°C及-33.2°C。水－氯化鉀的共晶混合物隨時間的加熱曲線，更確定了共晶溫度。水－氯化鉀及水－氯化鎂之共晶組成分別為19.5wt%及21.6wt％的鹽類成份。水－氯化鉀之共晶組成也由共晶分數估算方法來確認。這些極近於共晶組成混合物的固體比熱，也利用熱分析儀數據求得。
The eutectic and liquidus temperatures of water-potassium chloride and water-magnesium chloride systems were measured using DSC in this study. The plots of liquidus temperatures as a function of composition show good agreement with partially available literature data. The measured eutectic temperatures of water-potassium chloride and water-magnesium chloride mixtures are –11.1 °C and –33.2°C, respectively. The heating curve of the eutectic mixture of water-potassium chloride was also used to confirm the eutectic temperature. The eutectic compositions of water-potassium chloride and watcr-ma~ncSIUI1\ chloride systems are 19.5 wt% KCI and 21.6 wt% MgCl2, respectively. The eutectic composition of water-potassium chloride was also estimated from the eutectic fraction data. In comparison with the available literature data, the DSC measurement and the eutectic fractional transformation methods provide consistent and accurate results. The solid state heat capacity data of the nearly eutectic binary mixtures were also evaluated from the measured DSC data.
關聯:
Journal of the Chinese Institute of Chemical Engineers ； 33卷5期 (2002 / 09 / 01) ， P469 - 475
