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

Abstract

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. (C) 1997 Elsevier Science B.V.