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Benedict–Webb–Rubin–Starling Equation of State + Hydrate Thermodynamic Theories: An Enhanced Prediction Method for CO 2 Solubility and CO 2 Hydrate Phase Equilibrium in Pure Water/NaCl Aqueous Solution System

Author

Listed:
  • Changyu You

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Chinese Academy of Sciences, Guangzhou 510640, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Zhaoyang Chen

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Chinese Academy of Sciences, Guangzhou 510640, China)

  • Xiaosen Li

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Chinese Academy of Sciences, Guangzhou 510640, China)

  • Qi Zhao

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Chinese Academy of Sciences, Guangzhou 510640, China
    School of Energy Science and Engineering, University of Science and Technology of China, Hefei 230026, China)

  • Yun Feng

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Chinese Academy of Sciences, Guangzhou 510640, China
    School of Energy Science and Engineering, University of Science and Technology of China, Hefei 230026, China)

  • Chuan Wang

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Chinese Academy of Sciences, Guangzhou 510640, China
    School of Energy Science and Engineering, University of Science and Technology of China, Hefei 230026, China)

Abstract

Accurately predicting the phase behavior and physical properties of carbon dioxide (CO 2 ) in pure water/NaCl mixtures is crucial for the design and implementation of carbon capture, utilization, and storage (CCUS) technology. However, the prediction task is complicated by CO 2 liquefaction, CO 2 hydrate formation, multicomponent and multiphase coexistence, etc. In this study, an improved method that combines Benedict–Webb–Rubin–Starling equation of state (BWRS EOS) + hydrate thermodynamic theories was proposed to predict CO 2 solubility and phase equilibrium conditions for a mixed system across various temperature and pressure conditions. By modifying the interaction coefficients in BWRS EOS and the Van der Waals–Platteeuw model, this new method is applicable to complex systems containing two liquid phases and a CO 2 hydrate phase, and its high prediction accuracy was verified through a comparative evaluation with a large number of reported experimental data. Furthermore, based on the calculation results, the characteristics of CO 2 solubility and the variation of phase equilibrium conditions of the mixture system were discussed. These findings highlight the influence of hydrates and NaCl on CO 2 solubility characteristics and clearly demonstrate the hindrance of NaCl to the formation of CO 2 hydrates. This study provides valuable insights and fundamental data for designing and implementing CCUS technology that contribute to addressing global climate change and environmental challenges.

Suggested Citation

  • Changyu You & Zhaoyang Chen & Xiaosen Li & Qi Zhao & Yun Feng & Chuan Wang, 2024. "Benedict–Webb–Rubin–Starling Equation of State + Hydrate Thermodynamic Theories: An Enhanced Prediction Method for CO 2 Solubility and CO 2 Hydrate Phase Equilibrium in Pure Water/NaCl Aqueous Solutio," Energies, MDPI, vol. 17(10), pages 1-41, May.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:10:p:2356-:d:1393898
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    References listed on IDEAS

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    1. Wang, Xiaolin & Zhang, Fengyuan & Lipiński, Wojciech, 2020. "Research progress and challenges in hydrate-based carbon dioxide capture applications," Applied Energy, Elsevier, vol. 269(C).
    2. Aya, I. & Yamane, K. & Nariai, H., 1997. "Solubility of CO2 and density of CO2 hydrate at 30 MPa," Energy, Elsevier, vol. 22(2), pages 263-271.
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