Thermodynamic Reevaluation and Experimental Validation of the CsNO3-KNO3-NaNO3 System and Its Subsystems

doi:10.1007/s40242-017-6137-7

Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (1): 122-128.doi: 10.1007/s40242-017-6137-7

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Thermodynamic Reevaluation and Experimental Validation of the CsNO₃-KNO₃-NaNO₃ System and Its Subsystems

AN Xuehui¹, ZHANG Peng¹, CHENG Jinhui¹, CHEN Shuanglin^2,3, WANG Jianqiang¹

1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China;
2. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, P. R. China;
3. CompuTherm., Limited Liability Company, Madison, WI 53719, USA

Received:2016-04-08 Revised:2016-07-06 Online:2017-02-01 Published:2016-08-29
Contact: AN Xuehui,E-mail:anxuehui@sinap.ac.cn E-mail:anxuehui@sinap.ac.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.21406256), the Strategic Priority Research Program (No.XD02002400) and the Foundation of "Youth Innovation Promotion Association" of Chinese Academy of Sciences.

Abstract

Abstract:

Phase equilibria and thermodynamic properties of the CsNO₃-KNO₃-NaNO₃ system and its three subsystems were optimized thermodynamically and validated experimentally. The liquid and end solid solution phases of the KNO₃-NaNO₃ and CsNO₃-KNO₃ systems were modeled using the substitutional solution and compound energy formalism models, respectively. The CsNO₃-KNO₃-NaNO₃ ternary system was described thermodynamically based on the self-consistent thermodynamic parameters of the three binary systems. A set of thermodynamic parameters was obtained to reproduce the available information on the thermodynamic properties and phase equilibria. Melting temperature, enthalpy, and specific heat capacity of a eutectic sample were determined using differential scanning calorimetry(DSC). The results show a good consistency with the calculated results, suggesting the reliability of the current thermodynamic database. This work is useful for the construction of multicomponent nitrates and to provide guidance for the development of new medium for thermal energy storage.

Key words: Thermal energy storage, Nitrate, Calphad, Phase diagram

AN Xuehui, ZHANG Peng, CHENG Jinhui, CHEN Shuanglin, WANG Jianqiang. Thermodynamic Reevaluation and Experimental Validation of the CsNO₃-KNO₃-NaNO₃ System and Its Subsystems[J]. Chemical Research in Chinese Universities, 2017, 33(1): 122-128.

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Thermodynamic Reevaluation and Experimental Validation of the CsNO₃-KNO₃-NaNO₃ System and Its Subsystems

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