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Generating binary and ternary phase diagrams using HYSYS or UniSim

Plots of vapor-liquid equilibrium (VLE) and liquid-liquid equilibrium (LLE) have two important uses:

1. As an aid to designing separation methods.

2. To compare with experimental data in order to validate the thermodynamic model chosen.

Here’s how to create binary and ternary VLE and LLE diagrams using an extension:

1. You must be logged on to the computer as an Administrator, because registering an extension modifies the code on the C drive, and this is permitted only for Administrators. Thus, you may require the assistance of one of your IT people to do this.

2. Right click on EqPlots.dll and Save Target to a convenient location on your computer. Save EqPlots.edf to the same location.

3. Create a case containing the components of interest and choose a suitable fluid package. (Can be more than two components.)

4. Go to the Simulation Environment

5. Go to Tools/Preferences/Extensions and Click on Register an Extension. Find EqPlots.dll and open it. This will remain part of HYSYS or UniSim on your machine until it is Unregistered. Close Preference.

6. Go to Flowsheet/Add Operation. Select the Extensions category and Add Equilibrium Plots. This should open the equilibrium plots extension.

7. For a Binary plot, click the Binary tab at the bottom of the Equilibrium Plots menu, and select the components and the type of plot desired. For an XY plot, specify either T or P, and click on Plot. For a TXY plot, specify P. For a PXY plot, specify T.

8. For a Ternary plot, click the Ternary tab, select the components, the type of plot (VLE or LLE), and both T and P. Click on Plot. If nothing is plotted, it is because there is only one phase present at the selected T and P. If two phases are present, the phase envelopes and tie-lines will be shown connecting compositions in equilibrium with one another.

Created July 1, 2007. Updated January 21, 2009. Please email questions, comments and suggestions to W.R. Wilcox

Disclaimer: The material on these pages is intended for instructional purposes by Clarkson University students only. Neither Clarkson University nor Professor Wilcox is responsible for problems caused by using this information.

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