#!/usr/bin/env python
# coding: utf-8

# # Example: Hexane-Ethanol Flash Drum
# 
# ## Problem Statement
# 
# A 200 kg-mol/hour liquid ethanol/hexane mixture that is 20 mole % hexane needs to be separated. Experimental vapor/liquid equilibrium data measured at 1 atm is available in the accompanying chart (from http://www.ddbst.com/en/EED/VLE/VLE%20Ethanol%3BHexane.php) 
# 
# 1. What are the bubble point and dew point temperatures and compositions for this mixture?
# 2. Sketch a flowsheet for an isothermal flash drum operating at 1 atm that separates the mixture into liquid and vapor streams of 100 kg-mol/hour each. What fraction of the hexane is recovered in the vapor stream?
# 3. Modify your design so that the vapor stream is 50 mole % hexane. Now what fraction of the hexane is recovered in the vapor stream?
# 
# 
# \begin{align*}
# 200\,\frac{\mbox{kgmol}}{\mbox{hr}} & = F \\
# & = L + V \\
# & = L + 0.233L \\
# & = 1.233 L
# \end{align*}
# 
# 
# 
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