Chapter 13.13, Problem 27P

Interpretation Introduction

Interpretation:

Estimate the pressure and vapor–phase composition for a vapor–liquid–liquid equilibrium system of benzene (1) + water (2) at two temperatures: 303.15 K and 342.35 K.

Concept Introduction:

The phase equilibrium relationship is,

$P_1^{sat}+P_2^{sat}=P$

Here, pressure is $P$, vapor pressure of benzene is $P_1^{sat}$, and vapor pressure of water is $P_2^{sat}$.

The expression to obtain the vapor mole fraction of benzene is,

$y_1=\frac{P_1^{sat}}{P}$

Here, vapor mole fraction of benzene is $y_1$.

The vapor pressure using Antoine equation is,

$P^{sat}={10}^{\left[A-\frac{B}{C+T\left(°\text{C}\right)}\right]}$

Here, temperature in degree Celsius is $T\left(°\text{C}\right)$, and Antoine coefficients are $A,B,\text{and}C$.