Application to an Equilibrium Stage

The above equations are combined with the following equations to complete the VLLE model An overall material balance relates the feed flow rate F to the liquid rates and the vapor rate V  

Component material balances based on the distribution between vapor and mixed liquid are expressed as 

The summation equations for the vapor and mixed liquid are combined in one equation  

In a similar manner, X and X are obtained from the following component bal- 

A 100 kmol/h stream containing ethylene glycol, furfural, and water is sent to a flash drum where the temperature and pressure are controlled such as to cause separation into two liquid streams and a vapor stream. At these conditions the /(-values are determined as listed below and may be assumed constant within the range of operations. It is required to calculate the product streams flow rates and compositions. 

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