Distillation Column with Two Feeds

A distillation column with a total condenser and a partial reboiler is used to separate a nonideal mixture composed of ethanol and water. Feed 1, the lower feed, is saturated vapor (, where is the feed quality), which is 30 mole% ethanol. Feed 2, the upper feed, is a subcooled liquid, which is 40 mole% ethanol. One mole of vapor must condense inside the column to heat four moles of feed two to its boiling point (, where is the feed quality). The column specifications are a distillate with 72 mole% ethanol and a residue with 2 mole% ethanol. The column has a reflux ratio equal to 1.0 and operates at a pressure equal to 101.325 kPa. Both feed 1 and 2 are input at their optimum feed locations. The total number of stages, for various values of the flow rates of both feeds (to be set by the user), can be obtained using the McCabe and Thiele graphical construction. The green lines are the operating lines for the top, middle, and bottom sections of the column. The blue lines are the feed lines for each feed. The equilibirum curve is shown in magenta and the staircase construction is displayed in black.



  • [Snapshot]
  • [Snapshot]
  • [Snapshot]


P. C. Wankat, Equilibrium Staged Separations, Englewood Cliffs, NJ: Prentice Hall, 1988.
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.

Mathematica »
The #1 tool for creating Demonstrations
and anything technical.
Wolfram|Alpha »
Explore anything with the first
computational knowledge engine.
MathWorld »
The web's most extensive
mathematics resource.
Course Assistant Apps »
An app for every course—
right in the palm of your hand.
Wolfram Blog »
Read our views on math,
science, and technology.
Computable Document Format »
The format that makes Demonstrations
(and any information) easy to share and
interact with.
STEM Initiative »
Programs & resources for
educators, schools & students.
Computerbasedmath.org »
Join the initiative for modernizing
math education.
Step-by-Step Solutions »
Walk through homework problems one step at a time, with hints to help along the way.
Wolfram Problem Generator »
Unlimited random practice problems and answers with built-in step-by-step solutions. Practice online or make a printable study sheet.
Wolfram Language »
Knowledge-based programming for everyone.
Powered by Wolfram Mathematica © 2018 Wolfram Demonstrations Project & Contributors  |  Terms of Use  |  Privacy Policy  |  RSS Give us your feedback
Note: To run this Demonstration you need Mathematica 7+ or the free Mathematica Player 7EX
Download or upgrade to Mathematica Player 7EX
I already have Mathematica Player or Mathematica 7+