Aspen simulation of ethanol-water azeotrope problem
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Aspen simulation was used to find the azeotropes present in various substances, with four substances entered: ethanol, propanone, chloroform, and water. As a result, only three azeotropes were found, namely: chloroform and water, chloroform, water, and propanone, and chloroform and propanone. No azeotrope of ethanol and water appeared. Is there something wrong?
This is a bug related to the version. As you can see, the boiling point of ethanol is exactly the same as that of propane; it’s clear that ethanol was added after performing an azeotrope search, by entering all the required components at once, which should eliminate any problems.
Sure enough, the two boiling points shown were the same. I created another one, and after entering all the values at once, I still encountered the same problem
This shouldn’t happen; turn off ASPEN completely, create a new setup, enter the three components at once, and then search for the azeotrope
After turning everything off, I created a new one, and sure enough, it worked properly
Take a close look to see if it’s ethanol that’s being used – or if it’s actually propanol. Additionally, for the ethanol-water system, UNIQUAC and NRTL give better predictions of VLE, while WILSON is less reliable
The input is fine; it might be a bug in the software. Closing it and recreating it resolved the issue