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

doi:10.21203/rs.3.rs-9216687/v1

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

2026 · doi:10.21203/rs.3.rs-9216687/v1

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This study investigated phase equilibria in the quinary brine system NaBr–MgBr2–CaBr2–SrBr2–H2O and a related quaternary subsystem (MgBr2–CaBr2–SrBr2–H2O) at 298.15 K, using an isothermal dissolution equilibrium approach to measure liquid compositions and identify solid precipitation forms. From these experimental data, the authors constructed equilibrium phase diagrams and then applied the Pitzer thermodynamic model with existing parameter sets to calculate solubility and generate simulated phase diagrams. They report good agreement between simulated and experimental phase diagrams, which they interpret as validation of the modeling accuracy. The paper’s main limitation is that it focuses on a single temperature (298.15 K) and relies on existing Pitzer model parameters rather than developing new ones. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

Abstract The oil-gas field brine of Nanyishan in Qinghai province is a liquid mineral resource of significant exploitation and utilization value. In addition to abundan 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 2 −CaBr 2 −SrBr 2 −H 2 O and its quaternary subsystem MgBr 2 −CaBr 2 −SrB r2 −H 2 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.

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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 | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Phase Diagrams of Quinary System NaBr–MgBr 2 –CaBr 2 –SrBr 2 –H 2 O and Its Quaternary Subsystem at 298.15 K: Experimental Determination and Thermodynamic Modeling Guo-liang Nie, Rui-zhi Cui, Hong-bao Ren, Wu Li This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9216687/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 7 You are reading this latest preprint version Abstract The oil-gas field brine of Nanyishan in Qinghai province is a liquid mineral resource of significant exploitation and utilization value. In addition to abundan 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 2 −CaBr 2 −SrBr 2 −H 2 O and its quaternary subsystem MgBr 2 −CaBr 2 −SrB r2 −H 2 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. Strontium bromide Phase diagram Phase equilibrium Solubility Pitzer model Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Reviews received at journal 08 May, 2026 Reviewers agreed at journal 07 May, 2026 Reviewers agreed at journal 03 May, 2026 Reviewers invited by journal 01 May, 2026 Editor assigned by journal 25 Mar, 2026 Submission checks completed at journal 25 Mar, 2026 First submitted to journal 24 Mar, 2026 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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