Separation of chlorineebromine-based solid solution in bittern tail solution by phase equilibrium

doi:10.1016/j.cjche.2025.03.009

Chinese Journal of Chemical Engineering ›› 2025, Vol. 83 ›› Issue (7): 62-71.DOI: 10.1016/j.cjche.2025.03.009

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Separation of chlorineebromine-based solid solution in bittern tail solution by phase equilibrium

Yulong Zhang^1,2,3, Hongchao Yue¹, Yanru Zhang¹, Yun Li², Hongfei Guo², Dong Xu³, Jilin Cao²

1 School of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, China;
2 Engineering Research Center of Seawater Utilization Technology of Ministry of Education, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China;
3 Technology Innovation Center for High Quality Cold Heading Steel of Hebei Province, Hebei University of Engineering, Handan 056038, China

Received:2025-01-15 Revised:2025-03-01 Accepted:2025-03-11 Online:2025-07-28 Published:2025-07-28
Contact: Hongfei Guo,E-mail:guohongfei@hebut.edu.cn;Jilin Cao,E-mail:caojilin@hebut.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (22478095 and 22008049), Hebei Provincial Key Research Projects (22374101D), Scientific Research Projects of Colleges and University in Hebei Province (QN2023007), Central Guidance Project for Local Science and Technology Development from S&T Program of Hebei (246Z1009G), Special Proof-of-concept Project on Basic Research from S&T Program of Hebei (E2024402143), Science and Technology Project of Hebei Education Department (CXY2023004), and Hebei University of Engineering Doctoral Scientific Research Start-up Foundation (SJ2401002210).

Separation of chlorineebromine-based solid solution in bittern tail solution by phase equilibrium

Yulong Zhang^1,2,3, Hongchao Yue¹, Yanru Zhang¹, Yun Li², Hongfei Guo², Dong Xu³, Jilin Cao²

1 School of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, China;
2 Engineering Research Center of Seawater Utilization Technology of Ministry of Education, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China;
3 Technology Innovation Center for High Quality Cold Heading Steel of Hebei Province, Hebei University of Engineering, Handan 056038, China

通讯作者: Hongfei Guo,E-mail:guohongfei@hebut.edu.cn;Jilin Cao,E-mail:caojilin@hebut.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (22478095 and 22008049), Hebei Provincial Key Research Projects (22374101D), Scientific Research Projects of Colleges and University in Hebei Province (QN2023007), Central Guidance Project for Local Science and Technology Development from S&T Program of Hebei (246Z1009G), Special Proof-of-concept Project on Basic Research from S&T Program of Hebei (E2024402143), Science and Technology Project of Hebei Education Department (CXY2023004), and Hebei University of Engineering Doctoral Scientific Research Start-up Foundation (SJ2401002210).

Abstract

Abstract: Solid solution hinders the extraction of bromine resources from bittern. To separate chlorineebrominebased solid solution in bittern tail solution, the solubilities of the quaternary system KCl-KBr-NaCl-NaBr-H₂O and its ternary subsystem NaBr-KBr-H₂O at 333.15 K were determined by the isothermal dissolution method, and the corresponding phase diagrams were conducted. An improved model was employed to predict the solubilities of the quaternary system KCl-KBr-NaCl-NaBr-H₂O at 333.15 K. The calculated results coincide with the experimental values, implying that the prediction method is feasible. A closed loop crystallization process for the separation of chlorineebromine-based solid solution in bittern tail solution was proposed and NaBr was obtained with a purity of 98.23%.

Key words: Solid solution, Solubility, Phase equilibria, Pitzer model, Crystallization

摘要： Solid solution hinders the extraction of bromine resources from bittern. To separate chlorineebrominebased solid solution in bittern tail solution, the solubilities of the quaternary system KCl-KBr-NaCl-NaBr-H₂O and its ternary subsystem NaBr-KBr-H₂O at 333.15 K were determined by the isothermal dissolution method, and the corresponding phase diagrams were conducted. An improved model was employed to predict the solubilities of the quaternary system KCl-KBr-NaCl-NaBr-H₂O at 333.15 K. The calculated results coincide with the experimental values, implying that the prediction method is feasible. A closed loop crystallization process for the separation of chlorineebromine-based solid solution in bittern tail solution was proposed and NaBr was obtained with a purity of 98.23%.

关键词: Solid solution, Solubility, Phase equilibria, Pitzer model, Crystallization

Yulong Zhang, Hongchao Yue, Yanru Zhang, Yun Li, Hongfei Guo, Dong Xu, Jilin Cao. Separation of chlorineebromine-based solid solution in bittern tail solution by phase equilibrium[J]. Chinese Journal of Chemical Engineering, 2025, 83(7): 62-71.

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Separation of chlorineebromine-based solid solution in bittern tail solution by phase equilibrium

Separation of chlorineebromine-based solid solution in bittern tail solution by phase equilibrium

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