Abstract
AbstractHenry's law constants for aqueous CO2, H2S and NH3 up to 300°C have been recalculated from literature vapour pressure, enthalpy and heat capacity data. The high vapour pressure of water above 150°C causes significant solute‐water interactions in the gas phase, which were calculated using the Peng‐Robinson cubic equation of state. The results were combined with selected ionization constant data to derive a vapour‐liquid equilibrium model for dilute solutions. The model reproduces experimental data for binary systems at solute molalities of up to 0.5 m at 100°C, 1.0 m above 250°C and ionic strengths below about 0.1 m.
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