The temperature-composition phase diagram for two immiscible liquids, benzene and water, is at constant pressure. Set the pressure with a slider. Set the overall benzene mole fraction with its slider. The bar graph shows the moles of liquid water (blue), liquid benzene (orange) and vapor (red), 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.

This simulation was created in the Department of Chemical and Biological Engineering, at University of Colorado Boulder for LearnChemE.com by Rachael Baumann under the direction of Professor John L. Falconer, with additional contributions by Derek M. Machalek and Garrison J. Vigil. It was converted from Mathematica to HTML5 by Neil Hendren. This simulation was prepared with financial support from the National Science Foundation. Address any questions or comments to learncheme@gmail.com. All of our simulations are open source, and are available on our LearnChemE Github repository.

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