Abstract
This paper reports the four-phase (ice + hydrate + difluoromethane + 3,3-dimethyl-2 butanone) equilibrium pressure-temperature conditions at temperatures (260.8 to 273.1) K in the system of water, CO_2and 3,3-dimethyl-2-butanone. The pressure range of the present measurements in the system is (0.087 to 0.120) MPa. the measurements were carried out using isochoric methods. Phase equilibrium conditions of the hydrate formed in this study were measured to be at higher temperatures and lower pressures than those of the structure-I difluoromethane simple hydrate. The results indeicate that structure H hydrate formed with difluoromethane and 3,3-dimethyl-2butanone is thermodynamically stable exclusively at the temperatures below freezing point of water.
