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In this work, hydrate−liquid water−vapor (H−L W −V) equilibrium data for methane (CH 4 ), carbon dioxide (CO 2 ), and four synthetic carbon dioxide (CO 2 ) rich natural gas mixtures are measured. The measured pressure and temperature are in the range of (1.10 to 15.29) MPa and (272.15 to 290.15) K, respectively. In addition, a thermodynamic model based on Peng−Robinson (PR) EoS coupled with van der Waals−Platteeuw and modified Krichevsky and Kasarnovsky (KK) equation has been used for prediction of the equilibrium condition. The comparison between experimental measurements and model prediction shows excellent agreement obtained with an absolute average error of temperature (AAE) as low as 0.09. Additionally, the enthalpy of dissociation for simple and mixed gas hydrates is estimated using the measured equilibrium data by applying the Clausius−Clapeyron equation.

In this work, the hydrate dissociation condition for carbon dioxide rich gas mixture in the presence of methanol, methanol + sodium chloride or calcium chloride, and ethylene glycol, ethylene glycol + sodium chloride or calcium chloride aqueous solution, were measured and reported. The measurements are carried out at temperature and pressure range of (263.85 to 284.75) K and (2.76 to 12.08) MPa. All data were measured using the isochoric pressure search method. In order to exhibit the inhibition effect of above-mentioned aqueous solution, a comparison was made between experimental data of carbon dioxide rich gas mixture in the presence of pure water and aqueous solutions consist of inhibitor and electrolytes. Furthermore, a thermodynamic model was used to correlate the experimental values.

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