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    "# Example: Hexane-Ethanol Flash Drum\n",
    "\n",
    "## Problem Statement\n",
    "\n",
    "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) \n",
    "\n",
    "1. What are the bubble point and dew point temperatures and compositions for this mixture?\n",
    "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?\n",
    "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?\n",
    "\n",
    "\n",
    "\\begin{align*}\n",
    "200\\,\\frac{\\mbox{kgmol}}{\\mbox{hr}} & = F \\\\\n",
    "& = L + V \\\\\n",
    "& = L + 0.233L \\\\\n",
    "& = 1.233 L\n",
    "\\end{align*}\n",
    "\n",
    "\n",
    "\n"
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