PREDICTION OF GAS HYDRATE PHASE BEHAVIOR WITH PRSV2 EQUATION OF STATE

In this paper, a simple thermodynamic model is developed to calculate the phase equilibrium of pure gas hydrates (CH4, C2H6, C3H8, CO2,N2,). The equality of fugacity approach is used to model the vapor-liquid-hydrate phase equilibrium. The van der Waals and Platteuw model is applied to describe the hydrate phase,and PRSV2 EOS with Van Laar-type twobinary- parameter mixing rule is chosen to calculate the fugacities of vapor and liquidphases. The model parameters are fitted to experimental data for pure gas hydrate, and this model is able to precisely predict vaporliquid- hydrate forming pressure for single guest hydrate