Temperature-Composition Diagram for Immiscible Liquids

The temperature-composition phase diagram for two immiscible liquids, benzene and water, is at constant pressure. Set the pressure with a slider to change the saturation temperature. Set the overall benzene mole fraction with its slider. The bar graph shows the moles of liquid water (blue), liquid benzene (orange) and vapor (green), which contain both components. The system contains one mole total. You can add heat to change the temperature and the amounts in each phase. At a given pressure, all three phases co-exist at only one temperature. When heat is added at this temperature, one of the liquid phases completely evaporates before the temperature increases.


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


The pressure of the vapor above two immiscible liquids, benzene and water, is the sum of the individual saturation pressures (benzene) and (water):
The Antoine equation is used to calculate the saturation pressures:
where , , and are Antoine constants for component , and is temperature (°C).
The dew point curves for the two liquids can be found by solving the following equations for temperature.
For conditions where liquid water is present:
and for conditions where liquid benzene is present:
where and are the vapor mole fractions for benzene and water.
The screencast video at [1] explains how to use this Demonstration.
[1] Temperature-Composition Diagram for Immiscible Liquids. www.colorado.edu/learncheme/thermodynamics/TxyImmiscibleLiquids.html.
    • 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+