Overview

The OLI MSE-SRK thermodynamic framework was developed for systems with high pressure (over 80 bar) and gasses containing high concentrations of carbon dioxide and hydrocarbons from C1 to C7. A good article can be found here: Mixed Solvent Electrolyte-Soave-Redlich-Kwong (MSE-SRK)

The MSE-SRK option in all of the OLI software products, including UniSim Design, is enabled in the MSE thermodynamic framework by adding a user database. There is no specific switch to be used.

Disclaimer

This tutorial uses the OLI Engine in UniSim Design version 12. While the tutorial is applicable to other versions, there may be some small differences in the user interface and results.  This tutorial also uses UniSim Design R500 with the same disclaimer.

Assumptions

This tutorial will not teach you how to use UniSim Design. Rather, we assume that you already know the basics of that product.  

It is also assumed that you know how to enable a user databank in UniSim Design when using the OLI Electrolyte Fluid Package. See: Using OLI Databanks in Honeywell UniSim® Design

Enabling the MSE-SRK

One of the oddities of the OLI databases is that the first three letters of the name of the database have to be unique. So, we cannot use the name MSESRK or similar since the master MSE public database is also called MSEPUB.

Thus, the actual name to be used is SRKMSE.ddb. This database is a system database and is stored in the OLI system database folder: C:\ProgramData\OLI Systems\Databanks\12.0.0

(note the version 12.0.0 in the path).

Please start UniSim Design and add the OLI Fluid Package in the normal manner. Make sure to select the MSE thermodynamic framework.  Then, add the database.

Next, add the path from above for the system database:

Add the name of the database SRKMSE and click the check box.

Close the box like any other UniSim Design box.

If this is the first time you have loaded this database since installing UniSim Design R500, you will see this message in the trace window:

You have now enabled the OLI MSE-SRK thermodynamic framework.

Conclusion

By following the steps outlined in this guide, you have successfully enabled the OLI MSE-SRK thermodynamic framework within UniSim Design. This framework enhances the accuracy of simulations involving high-pressure systems with significant concentrations of carbon dioxide and hydrocarbons.

Ensuring the correct setup of the SRKMSE database is critical for achieving reliable results in your thermodynamic calculations. If you encounter any issues, refer to the relevant OLI documentation or consult the support team for further assistance.

We hope this tutorial has been helpful in guiding you through the process. Happy modeling! 🚀