Prediction of methane and carbon dioxide solubility in water in the presence of hydrate

Most proposed technologies to form gas hydrates use continuously stirred tank reactors where gas is bubbled into the liquid. From a reactor modeling point of view, it is necessary to determine the gas solubility in the liquid with and without hydrates as this will dictate interphase mass transfer and affect overall conversion. This work assembled a model to predict these solubility values using the Trebble–Bishnoi equation of state, the van der Waals and Platteeuw model and the Holder model. Model predictions, as well as predictions from Henryʹs law, were compared to available experimental data of methane–water and carbon dioxide–water systems. Although Henryʹs law cannot be applied under hydrate–liquid water equilibrium, its accuracy was very good due to the small effect of pressure on solubility in that zone. The accuracy of the model in this work has been improved by re-adjusting its parameters with recent vapor–liquid water and vapor–liquid water–hydrate equilibrium data of methane–water and carbon dioxide–water systems.