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//A Textbook of Chemical Engineering Thermodynamics
//Chapter 8
//Phase Equilibria
//Example 7
clear;
clc;
//Given:
P1 = 135.4; //vapour pressure of benzene (kPa)
P2 = 54; //vapour pressure of toluene (kPa)
//To determine the pressure at the beginning and at the end of process
//At beginning
x = 0.5; //liquid phase composition
//Using eq. 8.51 (Page no. 332)
P_beg = P2 + (P1-P2)*x;
//At the end
y = 0.5; //vapour phase composition
//Using eq. 8.54 (Page no. 333) and rearranging
P_end = (P1*P2)/(P1-y*(P1-P2));
mprintf('Pressure at the beginning of the process is %f kPa',P_beg);
mprintf('\n Pressure at the end of the process is %f kPa',P_end);
//end
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