This work presents a novel model for aqueous electrolyte solutions that extends the Cubic PlusAssociation Equation of State by combining the Debye–Hückel theory for electrostatic interactions. Thismodel is applied to perform a fluid phase modelling study of aqueous tetra-n-butyl ammonium halidesolutions. The interaction parameters between cations/anions and water are evaluated by regression ofthe experimental mean ionic activity coefficients (MIAC) of the electrolyte. The results show that thisnovel model correlates reasonably well with the experimental MIAC (for example, the relative averagedeviations are 6.3% for the MIAC of tetra-n-butyl-ammonium bromide). The interaction parametersbetween cations/anions and gas are evaluated by regression of the experimental gas solubilities. Theresults show that this novel electrolyte model correlates reasonably well with gas solubility (for example,the relative average deviations are 2.9% for the nitrogen solubility in aqueous tetra-n-butyl-ammoniumbromide solutions). For a more complete evaluation of the model, the electrostatic terms, parameterestimation approaches, and salting effects on gas solubility are analysed and discussed in detail.
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