A mixture contains 20 mol% ethanol and 80 mol% ethyl acetate. If the operating p

Question

A mixture contains 20 mol% ethanol and 80 mol% ethyl acetate. If the operating pressure is 101.32 kPa, Find (using Rachford - Rice flash equations): Bubble point temperature Dew point temperature Will the mixture form an Azeotrope? If yes, determine the temperature and composition of the Azeotrope. You can use Excel/MAT LAB or any other computational software to do the calculations. Antoine equation parameters for the components are as follows: (vapor pressure in torr and temperature in degreeC) The activity coefficients can be calculated using the following equations: ln gamma_acetate = 0.855 / [1 + 0.855x_acetate / 0.753x_alcohol ln gamma_alochol = 0.753 / [1 + 0.753x_alcohol / 0.855x_acetate]

Explanation / Answer

The first step: Using Antoine Equation we can know the saturation T for every component using the total pressure of the system. You will obteined (Tsat Alcohol , Tsat acetate).

2 step: You have to calculate Tsistem= Xalcohol*TsatAlcohol+ Xacetate*Tsatacetate

3 step: Using Tsystem, you can calculate the Psat of every component with antoine equation.

4 step: Using Raoult Law, using only one specie, you can evaluate the composition in the steam phase.

5 step: You have to do this procedure to get a tolerance no more of 10% with the temperature.

NOTE: its to long the exercise, i need more time to response all the exercise

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