二氟二氯甲烷-1,1-二氟乙烷二元系恒温汽液平衡的研究

Study on Isothermal Vapor Liquid Equilibrium for Dichorodifloromethane-1,1 -Difloroethane Binary System

用带观察窗的静态平衡器测定了二氟二氯甲烷、1,1-二氟乙烷在常沸点以上的蒸汽压以及该二元系在29.81℃、39.90℃和49.86℃下的加压汽液平衡,获得了温度T、总蒸汽压p、系统总组成Z、系统总量n_T以及汽相体积V^(?)的数据。以物料衡算与由T,p、x推算y的方法相结合,求得了平衡相组成x、y。并进一步用修正的PR及修正的SRK状态方程成功地关联了数据。

Vapor pressures of pure dichorodifloromethane and 1, 1-difloroethane above ordinary boiling point and the isothermal vapor liquid equilibria of the binary system at 29.81, 39.90 and 49.86℃ are measured in a static high pressure equilibrium cell with viewing windows. Temperature T, total vapor pressur p, total amount n_T and volume of vapor phase V^(?) are taken directly from the experiment. With the use of the material balance and the method of calculating vapor phase composition y from T, p and x, equilibrium liquid and vapor phase compositions x and y of this binary system are obtained. The fugacity coefficients needed during the calculations and mole volume of vapor phase are estimated by the modified PR equation of state. Expermental data are correlated with the modified PR and modified SRK equation of state.