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Thermodynamic Investigation of the Eutectic Mixture of the \(\hbox {LiNO}_{3}\)\(\hbox {NaNO}_{3}\)\(\hbox {KNO}_{3}\)\(\hbox {Ca}(\hbox {NO}_{3})_{2}\) System

  • Qiang PengEmail author
  • Jing Ding
  • Xiaolan Wei
  • Gan Jiang
Article
  • 134 Downloads

Abstract

Molten nitrate salt is usually employed as heat transfer or energy storage medium in concentrating solar power systems to improve the overall efficiency of thermoelectric conversion. In the present work, the liquidus curves of the \(\hbox {LiNO}_{3}\)\(\hbox {NaNO}_{3}\)\(\hbox {KNO}_{3}\)\(\hbox {Ca}(\hbox {NO}_{3})_{2}\) system is determined by conformal ionic solution theory according to the solid–liquid equilibrium state of the binary mixture. The calculated eutectic temperature of the mixture is \(93.17\,{^{\circ }}\hbox {C}\), which is close to the experimental value of \(93.22\,{^{\circ }}\hbox {C}\) obtained from differential scanning calorimetry (DSC). Visualization observation experiments reveal that the quaternary eutectic mixture begins to partially melt when the temperature reaches \(50\,{^{\circ }}\hbox {C}\), and the degree of melting increases with temperature. The mixture is completely melted at \(\hbox {130}\,{^{\circ }}\hbox {C}\). The observed changes in the dissolved state at different temperatures correlate well with the DSC heat flow curve fluctuations.

Keywords

Differential scanning calorimetry (DSC) Eutectic mixture Molten nitrate salts Thermodynamic modeling 

List of symbols

\(\Delta G^{E}\)

Total excess free energy of mixing, \(\hbox {J}\cdot \hbox {mol}^{-1}\)

\(\Delta G_{\mathrm{i}}^E \)

Excess free energy of mixing, \(\hbox {J}\cdot \hbox {mol}^{-1}\)

\(\lambda _{ij} \)

Binary interaction energy parameter, \(\hbox {J}\cdot \hbox {mol}^{-1}\)

\(\Delta H_i^o \)

Enthalpy of fusion, \(\hbox {J}\cdot \hbox {mol}^{-1}\)

\(\Delta H_\mathrm{tr}\)

Transition enthalpy, \(\hbox {J}\cdot \hbox {mol}^{-1}\)

\(\Delta C_{p(i)} \)

Heat capacity difference between pure solid–liquid salt, \(\hbox {J}\cdot \hbox {mol}^{-1}\cdot \hbox {K}^{-1}\)

\(T_i^o \)

Melting point, K

\(T_{\mathrm{tr}}\)

Transition temperature, K

Notes

Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant Nos. 51406038, 51436009, 51376067). The authors would like to thank Edanz Group China for their editing work.

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.School of Chemistry and Chemical EngineeringGuangDong Pharmaceutical UniversityZhongshanPeople’s Republic of China
  2. 2.School of EngineeringSun Yat-sen UniversityGuangzhouPeople’s Republic of China
  3. 3.School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhouPeople’s Republic of China

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