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Solubility, Density, and Refractive Index of the Ternary System Na2B4O7 + Mg2B6O11 + H2O at 308.15 K

  • CHEMICAL THERMODYNAMICS AND THERMOCHEMISTRY
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Abstract

Experimental studies on the solubility, density and refractive index in the ternary system (Na2B4O7 + Mg2B6O11 + H2O) at 308.15 K were determined with the method of isothermal dissolution equilibrium. Based on the experimental results, the phase diagram and its corresponding physicochemical properties versus composition diagram in the system were plotted. In the phase diagram of the ternary system at 308.15 K, there are one eutectic point and two crystallization regions corresponding to the large area of inderite (Mg2B6O11 · 15H2O) and the relative small area of borax (Na2B4O7 · 10H2O), respectively. Neither double salt nor solid solution was found in this system. The physicochemical properties (density and refractive index) of the ternary system at 308.15 K changes regularly with the increasing of sodium borate concentration. The calculated values of density and refractive index using empirical equations of the ternary system are in good agreement with the experimental values.

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ACKNOWLEDGMENTS

The work was supported by the Program of the National Natural Science Foundation of China (nos. U1507109, U1707602, U1607123, 21773170, and 21106103), the Natural Science Foundation of Tianjin (no. 17JCYBJC19500), the Specialized Research Fund for Doctoral Program of Chinese Higher Education (no. 20111208120003), the Yangtze Scholars and Innovative Research Team in University of Ministry of Education of China (IRT-17R81), and the Innovative Research Team of Tianjin Municipal Education Commission (TD12-5004) are greatly acknowledged.

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Authors and Affiliations

  1. College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, 300457, Tianjin, P. R. China

    Shi-qiang Wang, Dong Zhao, Yun Song, Xue-min Du, Ya-fei Guo & Tian-long Deng

  2. Tianjin Key Laboratory of Marine Resources and Chemistry, 300457, Tianjin, P. R. China

    Shi-qiang Wang, Ya-fei Guo & Tian-long Deng

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  1. Shi-qiang Wang
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  2. Dong Zhao
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  3. Yun Song
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  4. Xue-min Du
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  5. Ya-fei Guo
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  6. Tian-long Deng
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Correspondence to Shi-qiang Wang.

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Shi-qiang Wang, Zhao, D., Song, Y. et al. Solubility, Density, and Refractive Index of the Ternary System Na2B4O7 + Mg2B6O11 + H2O at 308.15 K. Russ. J. Phys. Chem. 92, 2601–2605 (2018). https://doi.org/10.1134/S0036024418130289

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