Phase equilibrium data of the system CO2 + glycerol plus methanol at high pressures

In this work, phase equilibrium data of the ternary system CO2(1) + glycerol(2)+ methanol(3) at high pressures are presented. The static synthetic method using a variable-volume view cell was employed to obtain the phase envelope in the temperature range of 303.15-343.15 K and at pressures up to 22 MPa. For the pressure transition measurements a given amount of carbon dioxide was injected into a methanol:glycerol mixture with a known molar ratio. Three different methanol to glycerol molar ratios were investigated (1:30, 1:20 and 1:12). The mole fraction of carbon dioxide was varied according to the system as follows: 0.3373-0.9741 for the glycerol to methanol molar ratio of 1:30, 0.2524-0.9949 for the molar ratio of 1:20, 0.2625-0.9940 for the molar ratio of 1:12. A complex phase behavior including vapor-liquid (VL), liquid-liquid (LL) and vapor-liquid-liquid (VLL) transitions were observed for these systems. (C) 2011 Elsevier B.V. All rights reserved.