Liquid Equilibrium The Flash Separator

Calculating vapor-liquid equilibrium is one of the classic problems in any introduction to numerical analysis. It is also very simple from both a conceptual and a mathematical point of view. Moreover, it does not require too many chemical engineering fundamentals, making it good for other communities. 

Let us consider the problem proposed by Henley and Rosen (1969), which we already looked at in Example 1.5. 

This analyzes bubble point calculation, a special case in point. To calculate the bubble point, the problem is reduced to a single equation in one unknown temperature. Now, for the same mixture of toluene and 1-butanol, the problem is to calculate flash separator conditions when vapor flow is V = 25. 

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