There is no gas phase in the results of the ammonia flash module
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I now want to use the Aspen Plus Flash module to calculate the gas-phase composition of ammonia water at 1 bar, 15% w/w, and 15°C, but the results show no gas phase – only a liquid phase. Logically, there should be a gas phase containing water vapor and ammonia; I’m not sure why this is the case, and I hope someone with more knowledge can provide guidance.
Please carefully check whether the settings for the material property method are reasonable You should use the activity coefficient equation for this; please check one of my previous posts
Thank you for your reply. I’m using the E-NRTL property method, which should be correct. It still doesn’t work. Is it because below a certain boiling point there is only a liquid phase, and no vapor can be formed through flashing?
The NRTL result is 1.54% wt