CO_2－环氧化物－甲苯的汽液平衡及CO_2在体系中的分配

Phase equilibria and CO_2 distribution in the CO_2-epoxide-toluene system

对由ＣＯ２、环氧丙烷、环氧乙烷、聚碳酸亚丙酯、甲苯等构成的７个体系在４０～７０℃的气液平衡作了简易测定和闪蒸计算，结果与用Ｐｅｎｇ—Ｒｏｂｉｎｓｏｎ状态方程法计算的完全一致；计算了ＣＯ２在液相及在整个体系中的浓度比α，发现它与ＣＯ２在单位可占据容积中的质量与温度乘积成线性关系：回归相关系数为－０．９５，式中Ｔ为体系温度（Ｋ），Ｗ１为ＣＯ２总重（ｇ），Ｖｏ、Ｖ１和Ｖ１分别为体系总容积、液相体积和液相中各组分体积（ｍｌ），下标１表示超临界组分ＣＯ２。

he liquid-vapor equilibria at 40-70℃in the system consisting of CO2,propylene oxide,ethylene oxide,poly (propylene carbonate),and/or toluene were determined by simple measurements and flash calculation.The results coincided with those from the calculation by the Peng-Robinson Equation of State.The ratios of CO2 concentrations in the liquid phase to those in the whole system were also determined and found to depend upon the product of temperature and the weight of CO2in unit occupiable volume(The relevant coefficient was-0.95):where T is the temperature(K);W1 is the total weight of CO2 in the system;Vo,VL,and V1are the capacity of the system,the volume of the liquid phase,and the volumes of the components(mL),respectively;the subscript 1 denotes the supercritical component CO2.