Phase diagram prediction of systems Mn(NO3)2-M(NO3)n-H2O(M=Ca,Mg and Li) with modified BET-model

• 作者: 曾德文 樊栓狮 陈四海
• 来源期刊: 中国有色金属学会会刊（英文版）
• 学科: 化学
• 关键词: activity thermodynamic model solubility manganous nitrate heat storage materials
• 年，卷（期）: 2004,（6）
• 页码范围: 1192-1198
• 页数: 7页
• 分类号: O642.4
• 语种: 英文

摘要

BET-model parameters for the binary system Mn(NO3 )2-H2 O were obtained by fitting experimental water activities at 298.15 K. The values obtained in this work were compared to those fitted previously for the systems Ca(NO3)2-H2O and Zn(NO3)2-H2O, showing reasonable agreement. With the model parameters fitted at 298 K,the vapor pressure of the saturated solution for the phases Mn(NO3 )2 · 6 H2 O and Mn(NO3 )2 · 4 H2 O were predicted and shows quite good agreement with the experimental values. The phase diagram of the Mn(NO2 )2-H2O system reproduced by the BET model shows smaller deviation from the experimental data than that by the extended UNIQUAC model. The ternary phase diagrams of the systems Me(NO3)n-Mn(NO3)2-H2O (Me= Mg, Ca and Li) are predicted with the binary model parameter and compared with available experimental data. The predicted eutectic compositions were given as possible heat storage materials.