CLATHRATE PHASE-EQUILIBRIA FOR THE WATER PLUS DEUTERIUM-OXIDE PLUS CARBON-DIOXIDE AND WATER PLUS DEUTERIUM-OXIDE PLUS CHLORODIFLUOROMETHANE(R22) SYSTEMS

Clathrate phase equilibria for two ternary water + deuterium oxide + c arbon dioxide and water + deuterium oxide + chlorodifluoromethane (R22 ) systems were measured at several different mass % of water and deute rium oxide mixtures. Equilibrium dissociation pressures of these two t ernary systems at the three-phase (clathrate-liquid-vapor) boundaries range (1.43 to 4.86) MPa and (0.141 to 0.886) MPa, respectively. The t emperature range occupied by the three-phase boundary of the water + d euterium oxide + R22 system is a little larger than that of the water + deuterium oxide + carbon dioxide system. The dissociation pressures at the quadruple points were found to steadily increase with deuterium oxide composition.