What to do if the key components cannot be separated during Aspen simulation extraction?
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I’d like to ask the experts: what should I do if, when using Aspen’s EXTRACT module to simulate the extraction process, the key components cannot be separated?:'
Is it actually possible to separate them? What is used for the equation of state? Are there any missing binary interaction coefficients?
It is possible according to the literature; the NRTL equation of state is used, and the binary interaction coefficients are available. According to the literature, C4H6O2 exits at the top of the tower as C2H4O, while C3H6O exits at the bottom of the tower; however, after my experiments, most of these three components remained at the bottom of the tower.
For things with similar properties, why does the one with a higher molecular weight come out from the top of the tower? If you get all three substances at the bottom of the tower, then what comes out of the top of the tower?
A sensitivity module can be defined to determine which operating variables are related to the key components at the tower top
It might be due to the lack of interaction parameters in the second institute; you can use the group contribution method for estimation
Check the settings to ensure that the 1st and 2nd liquid values are set correctly.
It’s very likely a problem with the interaction parameters in the second institute; try using the group contribution method