Chemical Research in Chinese Universities

, Volume 34, Issue 3, pp 475–479 | Cite as

Experimental Investigation and Thermodynamic Modeling of the NaCl-NaNO3-Na2SO4 Ternary System

  • Xiang Li
  • Zejie Fei
  • Yang Wang
  • Leidong Xie


Molten salts as heat transfer and storage materials have been used to nuclear energy and concentrated solar power(CSP) applications. In this work, the system of molten salt mixture based on thermodynamic principles was designed as thermal energy storage(TES) materials. The substitutional solution model can be employed to describe the Gibbs energies of all liquid phase. Thermodynamic model parameters for the NaCl-NaNO3-Na2SO4 subsystems were conducted by thermodynamic evaluation and optimization based on experimental phase-equilibria data. Thus, a set of self-consistent thermodynamic database was eventually obtained to reliably calculate the whole phase diagram and thermodynamic properties for the NaCl-NaNO3-Na2SO4 ternary system. The results manifest that the eutectic point of theternary system located at T=280 °C and xNaCl=8.4%, \({x_{NaN{O_3}}}\) =86.3% and \({x_{N{a_2}S{O_4}}}\)=5.3%. Moreover, the results predicted were verified experimentally using differential scanning calorimetry(DSC) and the agreement between the measured value[T=(287±2) °C] and predicted value(T=280 °C) was satisfactory. Thus, the thermodynamic calculation method will be used to design and develop novel molten salt mixture as thermal energy storage materials.


Thermodynamics modeling Molten salt Thermal energy storage Phase diagram 


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Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghaiP. R. China
  2. 2.University of Chinese Academy of SciencesBeijingP. R. China

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