Coupling an equation of state and Henry's Law to model the phase equilibria of gases and brines: Examples in the N2–H2O–NaCl system |
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| Authors: | Renee J Perez Robert A Heidemann |
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| Institution: | aApplied Geochemistry Group, Department of Geology and Geophysics, University of Calgary, 2500 University Drive, Calgary Alberta, Canada, T2N 1N4;bDepartment of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, Calgary Alberta, Canada, T2N 1N4 |
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| Abstract: | We propose a thermodynamic model for the mixing of gases in aqueous sodium chloride solutions valid to high pressures, high temperatures, and high ionic strength solutions. Our model couples Henry's Law with any equation of state to reproduce experimental data in the aqueous-rich liquid and gas-rich vapor region. In our model, the chemical potential of the solute in the brine is related to the chemical potential of the solute in pure water through salting-out coefficients. The model reproduces all crucial phenomena of binary (gas–water) and pseudo-binary (gas–water–salt) vapor–liquid mixtures below their critical point. We applied the model to reproduce the phase behavior of nitrogen in water and NaCl brines. Results and discussions are shown. |
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| Keywords: | Nitrogen Solubility Water Sodium |
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