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Statement Of Problem

A liquid feed at its bubble point is to be fractionated in a column equivalent to 15 equilibrium stages including total condensor , partial reboiler. Feed is at the eight stage from the top.

• iso-Butane 0.1
• n - Butane 0.3
• iso-Pentane 0.2
• n- Pentane 0.3
• n- Hexane 0.1

• Pressure = 310.2435 kPa
• Relux Ratio = 3
• D/F Ratio = 0.4

Calculate percentage recovery of all components in distillate and bottom product

Solution :-

We will assume a linear temperture profile as a first approximation. At top plate of the column we will assume that temperature is equal to bubble point of least volatile component (iso - butane BP = 23.9^oC ). We assume a steady state and also the liquid and vapor flow rates are constant. At bottom of the column we will assume temperature to be equal to bubble point of most volatile component (n- Hexane BP = 115.556^oC). Now we can assume a linear temperature profile

To get the values for equilibrium constant K we will use Antoine Equation:

Values of Antoine constans are as follows :

To converge the solution we use Theta- convergence technique. Default value of theta is set to be 1, but we can always change its value if our results are not converging

Warning: This application is intended to be used only for demonstrational and educational purposes. It should not be used for any real time applicaiton. Author shall not be responsible for any loss incurred due to this application