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Modeling mass transfer of CO2 in brine at high pressures by chemical potential gradient

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Abstract

To investigate long-term CO2 behavior in geological formations and quantification of possible CO2 leaks, it is crucial to investigate the potential mobility of CO2 dissolved in brines over a wide range of spatial and temporal scales and density distributions in geological media. In this work, the mass transfer of aqueous CO2 in brines has been investigated by means of a chemical potential gradient model based on non-equilibrium thermodynamics in which the statistical associating fluid theory equation of state was used to calculate the fugacity coefficient of CO2 in brine. The investigation shows that the interfacial concentration of aqueous CO2 and the corresponding density both increase with increasing pressure and decreasing temperature; the effective diffusion coefficients decrease initially and then increase with increasing pressure; and the density of the CO2-disolved brines increases with decreasing CO2 pressure in the CO2 dissolution process. The aqueous CO2 concentration profiles obtained by the chemical potential gradient model are considerably different from those obtained by the concentration gradient model, which shows the importance of considering non-ideality, especially when the pressure is high.

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Authors and Affiliations

  1. Division of Energy Science, Luleå University of Technology, SE-97187, Luleå, Sweden

    YuanHui Ji & XiaoYan Ji

  2. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing, 210009, China

    XiaoHua Lu

  3. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing, 210096, China

    YongMing Tu

  4. Division of Structural Engineering and Bridges, Royal Institute of Technology (KTH), 10044, Stockholm, Sweden

    YongMing Tu

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  1. YuanHui Ji
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  2. XiaoYan Ji
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  4. YongMing Tu
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Correspondence to XiaoHua Lu.

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Ji, Y., Ji, X., Lu, X. et al. Modeling mass transfer of CO2 in brine at high pressures by chemical potential gradient. Sci. China Chem. 56, 821–830 (2013). https://doi.org/10.1007/s11426-013-4834-8

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  • DOI: https://doi.org/10.1007/s11426-013-4834-8

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