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Measurements and Calculations of Solid–Liquid Equilibria in the Ternary System NaCl–NaBr–H2O at 323 K

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Abstract

The solubilities of salts and densities of saturated solutions in the NaCl–NaBr–H2O system at 323 K were determined with the method of isothermal solution saturation. The equilibrium solid phases in this system are solid solutions [Na(Cl,Br)]. The solid–liquid equilibrium phase diagram of the system has no invariant point. It has only one univariant curve and one crystallization region {saturated with solid solution Na(Cl,Br)}. Based on the above experimental results, the solid solution compositions fit well to a quadratic function of the equilibrium liquid composition. Based on the solubility data in the ternary systems NaCl–NaBr–H2O, the activity product (Q) of the solid solution was formulated with a polynomial of the solid solution composition. The solubilities salts in the ternary system at 323 K were calculated by Pitzer equations with the activity product of the solid solution. The results agree well with the experimental data.

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Acknowledgments

This project was supported by the National Natural Science Foundation of China (41373062, 41172118), the Specialized Research Fund (20125122110015) for the Doctoral Program of Higher Education of China, and the Fund (KLSLRC-KF-13-HX-5) of Key Laboratory of Salt Lake Resources and Chemistry, Chinese Academy of Sciences (Qinghai Institute of Salt Lakes).

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Authors and Affiliations

  1. College of Materials, Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, Sichuan, People’s Republic of China

    Shi-Hua Sang, Rui-Zhi Cui, Yong-Xia Hu & Xiao-Xiao Zeng

  2. Key Laboratory of Mineral Resources Chemistry, Universities in Sichuan Province, Chengdu, 610059, People’s Republic of China

    Shi-Hua Sang, Rui-Zhi Cui & Yong-Xia Hu

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  1. Shi-Hua Sang
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Sang, SH., Cui, RZ., Hu, YX. et al. Measurements and Calculations of Solid–Liquid Equilibria in the Ternary System NaCl–NaBr–H2O at 323 K. J Solution Chem 43, 2133–2143 (2014). https://doi.org/10.1007/s10953-014-0264-2

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