Hi, I was curious about the possibility of retrieving the "activity coefficient" of solute in a solution by using methods like UNIFAC or NRTL. In Aspen Plus it is possible to retrieve these parameters, including fugacities. How is it possible to do this in Aspen Hysys?
Thanks in advance for your kind help
Sorry, we have no experience in determining the “Activity coefficient Calculation in Aspen Hysys”
Best regards
Prof. Dr. Ismail Tavman
I'm not sure how to get the program to give you fugacities directly but you could easily perform a series of flashes and calculate Kvalue = Y/X for each component. K= f/P where P is total pressure and f is fugacity so f=KP
ActuallyI am calculating LLE so I need to determine the activity of each component in the two liquid phases..
yes, but this should only valid in ideal conditions, right? Could you provide an example or some references?
Greetings Gianfranco,
I am more familiar with Aspen Plus, but my speculation is that it should be fairly similar to get the activity coefficients and fugacities. From the aspen plus user interface you can generate x-y VLE, curves for selected pairs of components which have binary parameters. This feature also generates associated properties such as the activity coefficients for these pairs. Fugacity Coefficients (PHIL, PHILMX, and PHIV) for liquid pure components, liquid mixtures, and vapor can also be obtained as a stream property. As mentioned above, if you have the binary parameters, you can do flashes on the relevant streams to get xi and yi compositions and do the calculations manually to get Fugacity. Because these are accessible from Aspen Plus its a certainty that they are also accessible in Hysys.
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