确定流动汽液平衡釜总压的直接法

本文提出了两种由体系温度(T)及汽液相组成(y,x)推算总压(P)的直接法。对二元体系,如果忽略气相非理想性,计算总压的公式如下: 式中P_1~0、P_2~0分别为组分1、2的饱和蒸汽压,P为在y_1~0组成下的总压。 P=y_1x_1P_1~0+y_2x_2P_2~0 式中:y_1、y_2分别为组分1、2的活度系数,可由图解积分法求得。用T、x、y、P均已知的体系数据,对上述两方法进行验算,结果计算值与实验值吻合。此法可直接确定用流动平衡釜测汽液平衡时的总压;对同时测定了T、x、y、P的体系可进行逐点的P检验。

DIRECT DETERMINATION OF SYSTEM PRESSURE AT VAPOR-LIQUID EQUILIBRIUM

Two methods for evaluating system pressure (p) at vapor-liquid equlibrium in terms of temperature (T), vapor and liquid compositions (y, x) are described. If gas nonideality can be neglected, methods for binary systems are given as follows: Where, P_1~0 and P_2~0 are saturated vapor pressure of components 1 and 2 respectively, y_1 and y_2 are activity coefficients of components 1 and 2 respectively, and p is the system pressure at equilibrium vapor composition y_1~0.The results calculated using the above methods are in good agreement with experimental results. These methods can also be used for p thermodynamic consistency test for systems where T, x, y, p are determined.