Evaporation crystallization for the extraction of potassium bromide from bitters by phase equilibrium

doi:10.1016/j.cjche.2024.11.015

Chinese Journal of Chemical Engineering ›› 2025, Vol. 79 ›› Issue (3): 212-218.DOI: 10.1016/j.cjche.2024.11.015

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Evaporation crystallization for the extraction of potassium bromide from bitters by phase equilibrium

Yulong Zhang^1,2,3, Yun Li¹, Hongfei Guo¹, Dong Xu³, Jilin Cao¹

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

Received:2024-07-21 Revised:2024-09-10 Accepted:2024-11-12 Online:2025-01-23 Published:2025-03-28
Supported by:
This work was supported by the National Natural Science Foundation of China (22008049 and 22478095), Hebei Provincial Key Research Projects (22374101D), 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).

Evaporation crystallization for the extraction of potassium bromide from bitters by phase equilibrium

Yulong Zhang^1,2,3, Yun Li¹, Hongfei Guo¹, Dong Xu³, Jilin Cao¹

1. Engineering Research Center of Seawater Utilization Technology of Ministry of Education, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China;
2. School of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, 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 (22008049 and 22478095), Hebei Provincial Key Research Projects (22374101D), 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: Aiming at the problems of complex process and high cost in the production of potassium bromide at present, the solubility data and the phase diagram of the quaternary system KBr–MgBr₂–K₂SO₄–MgSO₄–H₂O at 298.15 K were studied using the isothermal dissolution equilibrium method. The results showed that there are eight invariant points, sixteen univariant curves, and nine crystallization regions in the phase diagram which is complex and contains two double salts (K₂SO₄·MgSO₄·6H₂O and KBr·MgBr₂·6H₂O) and a metastable phase (MgSO₄·5H₂O). On the basis of the Pitzer model and HW model, the solubilities of the quaternary system were calculated, with which the corresponding phase diagram was plotted. By comparison, the evaluated phase diagram is in accordance with the measured one. Through analysis, the phase diagrams of the quaternary system at (298.15 and 323.15) K were combined to put forward a process to separate KBr from the system by evaporation and crystallization, which realized the full circulation of the mother solution.

Key words: Potassium bromide, Phase equilibria, Solubility, Pitzer model, Crystallization

摘要： Aiming at the problems of complex process and high cost in the production of potassium bromide at present, the solubility data and the phase diagram of the quaternary system KBr–MgBr₂–K₂SO₄–MgSO₄–H₂O at 298.15 K were studied using the isothermal dissolution equilibrium method. The results showed that there are eight invariant points, sixteen univariant curves, and nine crystallization regions in the phase diagram which is complex and contains two double salts (K₂SO₄·MgSO₄·6H₂O and KBr·MgBr₂·6H₂O) and a metastable phase (MgSO₄·5H₂O). On the basis of the Pitzer model and HW model, the solubilities of the quaternary system were calculated, with which the corresponding phase diagram was plotted. By comparison, the evaluated phase diagram is in accordance with the measured one. Through analysis, the phase diagrams of the quaternary system at (298.15 and 323.15) K were combined to put forward a process to separate KBr from the system by evaporation and crystallization, which realized the full circulation of the mother solution.

关键词: Potassium bromide, Phase equilibria, Solubility, Pitzer model, Crystallization

Yulong Zhang, Yun Li, Hongfei Guo, Dong Xu, Jilin Cao. Evaporation crystallization for the extraction of potassium bromide from bitters by phase equilibrium[J]. Chinese Journal of Chemical Engineering, 2025, 79(3): 212-218.

Yulong Zhang, Yun Li, Hongfei Guo, Dong Xu, Jilin Cao. Evaporation crystallization for the extraction of potassium bromide from bitters by phase equilibrium[J]. 中国化学工程学报, 2025, 79(3): 212-218.

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Evaporation crystallization for the extraction of potassium bromide from bitters by phase equilibrium

Evaporation crystallization for the extraction of potassium bromide from bitters by phase equilibrium

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