its4am

I'm not sure if it might help you one day, but I solved my problem by progressively adjusting the reflux and bottom molar flow s to match those of the HYSYS simulation instead of specifying the desired purity/product recovery. Directly putting the purity specifications and running the simulation (which works in HYSYS and with the shortcut column) does not work and results in the error message I mentioned in my first post. Feel free to contact me one day if you want to address this when you have more...

That’s understandable. Thank you for all your efforts. I'll try to find a solution by trial-and-error.

Thank you for your reply Mr Medeiros. Is there a way I check which spec is unfeasible? I can get the same column to work in HYSYS and a shortcut column works fine in DWSIM.

Hello everyone, I'm trying to simulate the dehydrogenation of propane into propylene. In my current process, I first convert propane to propylene in an equilibrium reactor, resulting in a feed of propane, propylene and hydrogen, each representing about one third of the molar fraction. Before separating propylene from propane, I want to remove hydrogen through distillation. However, whenever I run my simulation, I get an error message saying 'PR EOS unable to calculate compressibility factor at given...

Thank you for your reply. I tested the new simulation today. The Gibbs reactor now works when I use the Classic UI. Thank you! However, when using the ER, I now get 'This error occurs when the PR EOS is unable to find a density root with the given parameters.' The message is in French, but it seems that the software doesn't realize that the mole fractions are numerals. 166 29/01/2018 17:46:25 Error PR EOS: unable to find a root with provided parameters [T = 673,15 K, P = 101325 Pa, MoleFracs={ Non...

Thank you for your reply. I tested the new simulation today. The Gibbs reactor now works when I use the Classic UI. Thank you! However, when using the ER, I now get 'This error occurs when the PR EOS is unable to find a density root with the given parameters.' The message is in French, but it seems that the software doesn't realize that the mole fractions are numerals. 166 29/01/2018 17:46:25 Error PR EOS: unable to find a root with provided parameters [T = 673,15 K, P = 101325 Pa, MoleFracs={ Non...

Thank you for your reply. I tested the new simulation today. The Gibbs reactor now works when I use the Classic UI. Thank you! However, when using the ER, I now get 'This error occurs when the PR EOS is unable to find a density root with the given parameters.' The message is in French, but it seems that the software doesn't realize that the mole fractions are numerals. 166 29/01/2018 17:46:25 Error PR EOS: unable to find a root with provided parameters [T = 673,15 K, P = 101325 Pa, MoleFracs={ Non...

Thank you for your reply. I tested the new simulation today. The Gibbs reactor now works when I use the Classic UI. Thank you! However, when using the ER, I now get 'This error occurs when the PR EOS is unable to find a density root with the given parameters.' The message is in French, but it seems that the software doesn't realize that the mole fractions are numerals. 166 29/01/2018 17:46:25 Error PR EOS: unable to find a root with provided parameters [T = 673,15 K, P = 101325 Pa, MoleFracs={ Non...