An Accurate Model to Calculate CO2 Solubility in Pure Water and in Seawater at Hydrate–Liquid Water Two-Phase Equilibrium

Understanding of CO2 hydrate–liquid water two-phase equilibrium is very important for storage in deep sea and submarine sediments. This study proposed an accurate thermodynamic model to calculate solubility pure seawater at (HLWE). The van der Waals–Platteeuw coupling with angle-dependent ab initio intermolecular potentials was used the chemical potential hydrate phase. Two methods were describe aqueous One using Pitzer activity Poynting correction fugacity dissolved water. Another Lennard–Jones-referenced Statistical Associating Fluid Theory (SAFT-LJ) equation state (EOS) CO2. There are no parameters evaluated from experimental data HLWE this model. Comparison indicates that can high accuracy. predicts increases increasing temperature, which agrees well available data. In regards pressure salinity dependences HLWE, there some discrepancies among decreases salinity, consistent most sets. Compared previous models, covers a wider range (up 1000 bar) generally more solutions composition A computer program calculation be obtained corresponding author via email.