Activity for its4am
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its4am posted a comment on discussion Help (Classic UI)
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...
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That’s understandable. Thank you for all your efforts. I'll try to find a solution by trial-and-error.
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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Hello, I'm working on the conversion of ethanol to acetaldehyde. I'm trying to replicate results from in the literature (10.1039/c4cs00105b), more specifically equilibrium compositions obtained with Aspen Plus using the Equilibrium based reactor (REquil). I tried replicating the data using the 'Gibbs and Equilibrium Reactors' sample. In the case of the Gibbs reactor, I get the message "Index was outside the bounds of the array." I'm not exactly sure what I am doing wrong; I read the forum and couldn't...
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Hello, I'm working on the conversion of ethanol to acetaldehyde. I'm trying to replicate results from in the literature (10.1039/c4cs00105b), more specifically equilibrium compositions obtained with Aspen Plus using the Equilibrium based reactor (REquil). I tried replicating the data using the 'Gibbs and Equilibrium Reactors' sample. In the case of the Gibbs reactor, I get the message "Index was outside the bounds of the array." I'm not exactly sure what I am doing wrong; I read the forum and couldn't...
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