Clathrate phase behavior of the phenolmethane, phenolcarbon dioxide and phenolnitrogen systems

Three-phase, solid clathratephenol-rich liquid-vapor, equilibrium lines for the two binary phenolmethane and phenolcarbon dioxide systems were measured using a newly-designed equilibrium apparatus. The measured clathrate dissociation pressure and corresponding temperature ranges are 88.8–326.8 bar and 312.4–325.4 K for the phenolmethane system and 21.0–99.2 bar and 314.2–319.3 K for the phenolcarbon dioxide system. An abrupt increase of dissociation pressures appeared near 319 K for the phenolcarbon dioxide system, while the phenolmethane system shows a continuous increase of dissociation pressures with no abrupt change over the whole range. In addition, three-phase, solid phenolphenol-rich liquid-nitrogen gas, equilibrium line for the phenolnitrogen system was also determined at the temperature range of 313.4–314.0 K and pressure range of 1.0–180.4 bar and showed a temperature minimum at 313.4 K. No clathrate phase was found in this system.