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Phase Equilibria and Phase Diagrams for the Ternary Systems (KCl/K2SO4 + KB5O8 + H2O) at 298.15 K and 101.325 kPa

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Abstract

The isothermal dissolution equilibrium method and Schreinemakers’ method were employed to study the two ternary systems (KCl + KB5O8 + H2O) and (K2SO4 + KB5O8 + H2O) at 298.15 K and 101.325 kPa, and the solubilities, physicochemical properties (density, ρ, and refractive index, nD) for these two systems were determined experimentally. In both ternary systems, there are one eutectic point, two solubility isotherm curves, and two crystallization zones corresponding to potassium pentaborate tetrahydrate (KB5O8·4H2O, PP4), and sylvite (KCl, Sy) in the former system or arcanite (K2SO4, Ar) in the later. For the both ternary systems, the refractive indices and densities first increased gradually to reach their maximum values at the invariant points, but then decreased with increase in concentration of potassium chloride (in the former system) or potassium sulfate (in the latter system) in the solution. Both ternary systems belong to hydrate type Ι, and neither double salts nor solid solution are formed.

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Acknowledgements

Financial supports from the National Natural Science Foundation of China (U1607123 and 21773170), the Key Projects of Natural Science Foundation of Tianjin (18JCZDJC10040) and the Yangtze Scholars and Innovative Research Team in Chinese Universitiesy (IRT_17R81) are acknowledged.

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  1. Tianjin Key Laboratory of Marine Resources and Chemistry, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin, 300457, People’s Republic of China

    Yan Yu, Kaiyu Zhao, Yafei Guo, Xia Wang & Tianlong Deng

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  1. Yan Yu
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  2. Kaiyu Zhao
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  3. Yafei Guo
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  4. Xia Wang
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Correspondence to Yafei Guo.

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Yu, Y., Zhao, K., Guo, Y. et al. Phase Equilibria and Phase Diagrams for the Ternary Systems (KCl/K2SO4 + KB5O8 + H2O) at 298.15 K and 101.325 kPa. J Solution Chem 48, 1135–1146 (2019). https://doi.org/10.1007/s10953-019-00892-0

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