PHASE EQUILIBRIA AND CO2 DISTRIBUTION IN THE Co2-EPOXIDE-TOLUENE SYSTEMS

The liquid-vapor equilibria at 40—70℃ in the systems consisting ofCO,propylene oxide,ethlyene oxide,poly（propylene carbonate）,and/ortoluene were determined by simple measurements and flash calculation.The re-sults coincided with those calculated by the Peng—Robinson equation of state.The ratios of the COconcentration in the liquid phase vs. that in the whole sys-tem were also determined and found to depend upon the product of temperature T（K）multiplying the weight of COin unit volume which it may occupy ac-cording to the following regression equation with a relevant coefficient of0.95:α=（ρV/V）/（W/V）=1.68-0.0030 TW/（V-V-V）whereW（g）is the total weight of COin the system;Vand Vare respectively thesystem capacity,the volume of the liquid phase; Vis the volume of COdis-solved in the liquid phase;Vand Vare respectively the volumes of other liquidcomponents（mL）.