Interactive Self-Study Module: Partially-Miscible Liquids Phase Diagrams
Department of Chemical and Biological Engineering, University of Colorado Boulder 

This module uses screencasts and interactive simulations to explain the vapor-liquid phase equilibrium of two liquids that partially miscible in the liquid phase. Both pressure-composition and temperature-composition diagrams are explained. It then provides example problems to allow the user to test themselves. We suggest using the learning resources in the following order:

    1. Attempt to answer the multiple-choice ConcepTests before watching the screencasts or working with the simulations.
    2. Watch the screencasts that describe the phase diagrams and answer the questions within the screencasts.
    3. Use the interactive simulations to further understand the behavior of the phase diagrams.
    4. Try to solve the two example problems before watching the solutions in the screencasts.
    5. Answer the ConcepTests.

    Partial miscibility is important in some separations.

    This module is intended for a thermodynamics course and a separations course.

    Before studying this module, you need to:

    • Be able to identify what phases are present and what their compositions are on binary phase diagrams that show vapor-liquid equilibrium for non-ideal, miscible solutions. (Vapor-Liquid Equilibrium for Non-Ideal Solutions)
    • Know properties of an azeotrope and be able to identify an azeotrope on a phase diagram.

    After studying this module, you should be able to:
    1. Given temperature and composition, use phase diagrams for partially miscible liquids of binary systems to identify which phases are present. 
    2. Identify regions where liquid phase separation occurs on a phase diagram.