| 초록 |
Hydrate phase equilibria for the binary carbon dioxide+water and methane+water mixtures in silica gel pores of nominal diameters 6.0, 30.0, and 100.0 nm were measured and compared with the calculated results based on van der Waals and Platteeuw model. At a specific temperature, three phase HLV equilibrium curves for pore hydrates were shifted to the higher pressure condition depending on pore sizes when compared with those of bulk hydrates. Notably, hydrate phase equilibria for the case of 100.0 nominal pore size were nealy identical with those of bulk hydrates. The activities of water in porous silica gels were modified to account for capillary effect, and the calculation results were generally in good agreement with the experimental data. Physical properties such as enthalpy of dissociation and hydration number were also estimated from the data. |
