Measurement and thermodynamic modeling of carbon dioxide hydrate formation conditions using dry water through hydrophobic nano silica

Dry water is accounted for as an effective medium for gas storage in a clathrate hydrated form. We used the van der Waals-Platteeuw framework for correlation of the experimental CO2 hydrate formation conditions in the presence of dry water through a reversed micellar approach. Activity of water in a reversed micelle presented an effect on the thermodynamic characteristics of a dry water system. The binary interaction parameters of the UNIQUAC model was adjusted using the CO2 - H2O hydrate equilibrium formation conditions data. Due to the hydrophobic nature of the nanoparticles, the hydration forces contributed the predominant term at the water chemical potential function using a dry water medium. The results showed that dry water presented a thermodynamic promoter effect. Therefore, applying a water-in-air microemulsion model, a good agreement of the calculated values with the experimental data was demonstrated using the two adjustable parameters of the hydration force term.