9772

Batch Distillation of a Non-Miscible Binary Mixture

Consider a non-miscible binary mixture composed of benzene and water; this mixture presents a heteroazeotrope with a boiling temperature equal to 69.14°C and a benzene mole fraction approximately equal to 0.704. The NRTL (Non-Random Two-Liquid) model, developed by Renon and Prausnitz, is adequate in order to determine vapor-liquid equilibrium data.
This Demonstration dynamically simulates a simple batch distillation of this mixture. The temperature of the distillate is plotted versus time for selected values of the initial composition in the still.
The still is charged with 1000 kmol of the initial mixture. The vapor rate is assumed constant and equal to 10 kmol/hr.
It is found that (1) the first product to exit the column is the heteroazeotrope, which, as far as distillation is concerned, behaves as a low-boiling pure component; (2) if the initial composition is very rich in water (respectively in benzene) then this latter component will exit the column once all the benzene (respectively water) has left the column in the form of a binary heteroazeotrope.
If the initial composition is equal to the heteroazeotropic composition, then the temperature remains constant at all times and is equal to the boiling temperature of the heteroazeotrope (i.e., 69.14°C).
In addition, for this kind of separation, a single stage (i.e., simple batch distillation without a column) is sufficient and only two fractions are obtained (i.e., there is a sharp transition between the fraction containing the heteroazeotrope and the fraction containing either water or benzene; there is no intermediate fraction).
Applications of this type of distillation (i.e., involving a non-miscible mixture where one component is water) is hydrodistillation and steam-distillation of natural aromatic products to obtain essential oils, such as hydrodistillation of bitter-orange flowers to obtain neroli.

SNAPSHOTS

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









 
RELATED RESOURCES
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 © 2014 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+