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The liquid-vapor equilibria at 40—70℃ in the systems consisting ofCO_2,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 CO_2 concentration 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 CO_2 in unit volume which it may occupy ac-cording to the following regression equation with a relevant coefficient of0.95:α=(ρ_1V_1/V_L)/(W_1/V_O)=1.68-0.0030 TW_1/(V_0-V_2-V_3)whereW_1(g)is the total weight of CO_2 in the system;V_O and V_L are respectively thesystem capacity,the volume of the liquid phase; V_1 is the volume of CO_2 dis-solved in the liquid phase;V_2 and V_3are respectively the volumes of other liquidcomponents(mL).
The liquid-vapor equilibria at 40-70 ° C in the systems consisting ofCO_2, propylene oxide, ethlyene oxide, poly (propylene carbonate), and / ortoluene were determined by simple measurements and flash calculation. Re-sults coincided with those calculated by the Peng-Robinson equation of state. The ratios of the CO_2 concentration 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 CO_2 in unit volume which may occupy ac-cording to the following regression equation with a relevant coefficient of 0.95: α = (ρ_1V_1 / V_L) / (W_1 / V_O) = 1.68-0.0030 TW_1 / (V_0 -V_2 -V_3) whereW_1 (g) is the total weight of CO_2 in the system; V_O and V_L are respectively the system capacity, the volume of the liquid phase; V_1 is the volume of CO_2 dis-solved in the liquid phase; V_2 and V_3are respectively the volumes of other liquidcomponents (mL ).