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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (15): 1725-1730.    下一篇

研究论文

体系Mg(NO3)2-MgCl2-H2O作为相变储能材料的相图预测

周权宝,尹霞*, 汪琼,王成   

  1. (湖南大学化学化工学院 长沙 410082)
  • 投稿日期:2011-04-15 修回日期:2011-05-31 发布日期:2011-06-23
  • 通讯作者: 尹霞 E-mail:yinxia0405@yahoo.com.cn
  • 基金资助:

    湖南大学理科化学基地

Phase Diagram Prediction of the System Mg(NO3)2-MgCl2-H2O as Phase Change Materials

ZHOU Quan-Bao, YIN Xia, WANG Qiong, WANG Cheng   

  1. (College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082)
  • Received:2011-04-15 Revised:2011-05-31 Published:2011-06-23
  • Contact: Xia YIN E-mail:yinxia0405@yahoo.com.cn

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应用修正的BET热力学模型对Mg(NO3)2-MgCl2-H2O体系在273～373 K的相图进行预测, 发现两个共晶点, 并通过实验对共晶点组成材料的吸热和放热行为进行测定, 发现三元共晶点Mg(NO3)2•6H2O(45.6%)-Mg(NO3)2•2H2O (29.6%)-MgCl2•6H2O(24.8%)储能效果较差, 而二元共晶点Mg(NO3)2•6H2O(61.6%)-MgCl2•6H2O(38.4%)在熔点附近具有很好的储放热能力, 其相变热焓经差热分析为136.8 J•g－1, 说明该材料可用作潜在的相变储能材料.

关键词: BET模型, 溶解度, 硝酸镁, 氯化镁, 相变储能材料

The modified BET thermodynamic model was applied to predict phase diagram of the system Mg(NO3)2-MgCl2-H2O from 273 to 373 K, in which two eutectic points were found. The exothermal and endothermal behavior of the predicted eutectic points were measured and the results showed that the ternary eutectic point Mg(NO3)2•6H2O(45.6%)-Mg(NO3)2•2H2O(29.6%)-MgCl2•6H2O(24.8%) has poor energy-storage ability, while another binary eutectic point Mg(NO3)2•6H2O(61.6%)-MgCl2•6H2O(38.4%) has good exothermal and endothermal ability near the melting temperature with melting heat 136.8 J•g－1 determined by differential thermal analysis (DTA), and is expected to be used for the potential phase change material.

Key words: BET model, solubility, Mg(NO3)2, MgCl2, phase change material

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