Measured and Predicted Solubility Phase Diagrams of Quaternary Systems LiBr-NaBr-MgBr2-H2O and LiBr-KBr-MgBr2-H2O at 298.15 K

doi:10.1007/s40242-020-0154-7

Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (6): 1234-1240.doi: 10.1007/s40242-020-0154-7

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Measured and Predicted Solubility Phase Diagrams of Quaternary Systems LiBr-NaBr-MgBr₂-H₂O and LiBr-KBr-MgBr₂-H₂O at 298.15 K

CUI Ruizhi^1,2, LI Wu^1,2, DONG Yaping^1,3, LI Jun^1,2

1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, P. R. China;
2. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, P. R. China;
3. Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, P. R. China

Received:2020-05-25 Revised:2020-08-05 Online:2020-12-01 Published:2020-12-03
Contact: CUI Ruizhi E-mail:cuirzh@isl.ac.cn
Supported by:
Supported by the Natural Science Foundation of Qinghai Province, China(No.2020-ZJ-970Q), the National Natural Science Foundation of China(No.41903051), the "Thousand Talents Program for High-end Innovative Talents" of Qinghai Province, China, the CAS "Light of West China" Program and the State Administration of Foreign Experts Affairs G, China (No.20190144003).

Abstract

Abstract: The stable phase equilibria of quaternary systems LiBr-NaBr-MgBr₂-H₂O and LiBr-KBr-MgBr₂-H₂O at 298.15 K were studied by both experimental measurement(isothermal solution saturation method) and theoretical prediction(Pitzer model). The solubilities of the saturated solution have been determined experimentally and two stable phase diagrams and relevant water diagrams of the two quaternary systems were obtained. Results show that quaternary system LiBr-NaBr-MgBr₂-H₂O is hydrate II type as NaBr and NaBr·2H₂O coexistence. Its phase diagram consists of only one invariant point, four univariant curves, and five crystallization fields. The quaternary system LiBr-KBr-MgBr₂-H₂O is a complex type as the double salt KBr·MgBr₂·6H₂O formed. In addition to this double salt, the three single salts LiBr·2H₂O, KBr and MgBr₂·6H₂O also crystallize. In this paper, the solubilities of phase equilibria in above quaternary systems were also calculated by the Pitzer's electrolyte solution model. All the needed parameters can be obtained from the literature or be fitted by experimental data. On the Basis of the experimental and calculated results, the phase diagram of the quaternary system was plotted for comparison. It shows that the calculation results are consistent with the experimental ones.

Key words: Brine, Solubility, Phase diagram, Bromide, Pitzer's model

CUI Ruizhi, LI Wu, DONG Yaping, LI Jun. Measured and Predicted Solubility Phase Diagrams of Quaternary Systems LiBr-NaBr-MgBr₂-H₂O and LiBr-KBr-MgBr₂-H₂O at 298.15 K[J]. Chemical Research in Chinese Universities, 2020, 36(6): 1234-1240.

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Measured and Predicted Solubility Phase Diagrams of Quaternary Systems LiBr-NaBr-MgBr₂-H₂O and LiBr-KBr-MgBr₂-H₂O at 298.15 K

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