The water contents of compressed methane gas In equilibrium with water and diethylene glycol-water solutions of 0.156, 0.472, and 0.662 mole fraction water were measured at 298.15 and 323.15 K and pressures of 3, 5, and 8 MPa. The solubilities of methane In the diethylene glycol, water, and diethylene glycol-water solutions were also measured under the same conditions of the water content measurement. The methane solubility data were analyzed with the Krlchevsky-Kasarnovsky equation to obtain the Henry constant of methane In the diethylene glycol-water solutions.Gas dehydration plays an important part in gas purification processes. Diethylene glycol and triethylene glycol are effective gas dehydrating agents. A knowledge of the vapor-liquid equilibria in the gas-glycol-water system is helpful in designing an effective dehydration system. Takahashi et al. (1) have reported the vapor-liquid equilibrium data in the carbon dioxide-diethylene glycol-water and carbon dioxide-triethylene glycol-water systems. In this study, we measured the vapor-liquid equilibria in the methane-diethylene glycol-water system at 298.15 and 323.15 K and pressures of 3, 5, and 8 MPa.

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