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<p>The oil–gas field brine of Nanyishan in Qinghai province is a liquid mineral resource of significant exploitation and utilization value. In addition to abundant sodium, potassium, magnesium, and calcium, it contains a certain concentration of trace elements such as strontium and bromine. In-depth studies on its physicochemical properties are crucial for realizing comprehensive resource development and utilization. Focusing on the compositional characteristics of this brine, this study employed isothermal dissolution equilibrium method to investigate the phase equilibria of quinary system NaBr − MgBr<sub>2</sub> − CaBr<sub>2</sub> − SrBr<sub>2</sub> − H<sub>2</sub>O and its quaternary subsystem MgBr<sub>2</sub> − CaBr<sub>2</sub> − SrBr<sub>2</sub> − H<sub>2</sub>O at 298.15 K. Experimental determinations of liquid phase compositions and solid phase precipitation form were conducted, enabling the construction of equilibrium phase diagrams. Based on the Pitzer thermodynamic model, theoretical calculations of solubility data at 298.15 K were performed using existing model parameters. The results showed that simulated phase diagrams exhibited a good consistency with experimental ones, validating the model’s accuracy. The findings of this study not only provide a foundation for further research on multitemperature phase equilibria and thermodynamic properties of complex brine systems containing magnesium, calcium, strontium, and bromine, but also offer fundamental thermodynamic data to guide the comprehensive development and utilization of similar brine resources.</p>

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Phase Diagrams of Quinary System NaBr–MgBr2–CaBr2–SrBr2–H2O and Its Quaternary Subsystem at 298.15 K: Experimental Determination and Thermodynamic Modeling

  • 期刊论文

  • 发表日期：

    2026年7月26日

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  • Guoliang Nie,
  • Ruizhi Cui,
  • Hongbao Ren,
  • Wu Li

摘要

The oil–gas field brine of Nanyishan in Qinghai province is a liquid mineral resource of significant exploitation and utilization value. In addition to abundant sodium, potassium, magnesium, and calcium, it contains a certain concentration of trace elements such as strontium and bromine. In-depth studies on its physicochemical properties are crucial for realizing comprehensive resource development and utilization. Focusing on the compositional characteristics of this brine, this study employed isothermal dissolution equilibrium method to investigate the phase equilibria of quinary system NaBr − MgBr2 − CaBr2 − SrBr2 − H2O and its quaternary subsystem MgBr2 − CaBr2 − SrBr2 − H2O at 298.15 K. Experimental determinations of liquid phase compositions and solid phase precipitation form were conducted, enabling the construction of equilibrium phase diagrams. Based on the Pitzer thermodynamic model, theoretical calculations of solubility data at 298.15 K were performed using existing model parameters. The results showed that simulated phase diagrams exhibited a good consistency with experimental ones, validating the model’s accuracy. The findings of this study not only provide a foundation for further research on multitemperature phase equilibria and thermodynamic properties of complex brine systems containing magnesium, calcium, strontium, and bromine, but also offer fundamental thermodynamic data to guide the comprehensive development and utilization of similar brine resources.