We will be using iterative procedure for calculating Xi , NRTL eqns are given as;
......... activity coefficient of component 1
Using all these formulas and given information
Pressure at which first drop appears is dew point pressure;
first calculate vapou pressure of components at 50o C
for ethanol A = 16.8958 B = 3795.17 C = -42.232
for Water A = 16.3872 B = 3885.7 C = -42.98
Psat (ethanol)= 29.545 KPa Psat (water)= 12.405 KPa
Intially Assume x1 = x2 = 0.5
Using these values again repeat the procedure;
\
again iterating;
Therefore ; the dew point pressure is
Liquid composition
Q3 A binary vapor mixture contains 65.00% ethanol (1) in water (2) at 50 oC. Determine...