Distillation columns that perform difficult separations are called superfractionators. By difficult separations we mean that the relative volatility between the chemical components is quite low: less than 1.2 and approaching 1.05. Such low relative volatilities mean that there is very little difference between the composition of the liquid phase and the composition of the vapor phase in equilibrium with it. Hence many equilibrium stages are required to accomplish the separation.
KeywordsDistillation Column Manipulate Variable Reflux Ratio Relative Volatility Bottom Product
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