Interactive Self-Study Module: Single-Component Phase Diagrams 
Department of Chemical and Biological Engineering, University of Colorado Boulder 
Overview:

This module uses screencasts and interactive simulations to explain the phase equilibrium of a single-component. It explains phase diagrams, including vapor-liquid equilibrium and the critical point. It 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 two 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.
    Motivation:

    Understanding single-component phase behavior is important for many processes in chemical engineering and necessary to understand multi-component phase behavior.

    This module is intended for a Thermodynamics course and may also be useful for a Materials and Energy Balance course.


    Before studying this module, you should:

    • Be able to apply the Antoine equation to determine saturation pressure of a single component at a given temperature.

    After studying this module, you should be able to:
    1. Given a phase diagram, determine the state of a single-component system at a given pressure and temperature.
    2. Be able to explain how a single-component system changes as temperature or pressure changes.
    3. Explain the significance of a critical point and identify it on a single-component phase diagram.
    4. Explain how a liquid can become a vapor without going through a phase change. 
    5. Be able to draw a pressure-temperature diagram.
    6. Be able to identify melting point and boiling point on a P-T diagram at a selected pressure.
    7. Be able to identify the triple point on a P-T diagram and explain what phases are present at the triple point.