How to transfer the data estimated by ASPEN to the simulation module for calculation?
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Because the calculation error indicated that the DGSFRM parameter for phosphates was missing, I used the estimation function to come up with a value and added it myself to the properties parameters of the pure substance. Yet when I ran the calculation again, the same error occurred: \"Missing!\" Why is that? Did I not add it correctly to the database? How can I make the calculation module reference the data I have set? ****Property parameter error: the solid formation free energy (DGSFRM) is missing for the component “ORTHO(S)”. It is not possible to calculate the reaction constant. ! Calculations were stopped due to missing property parameters
COMPONENT “ORTHO(S)”"
Well, I found out later that it’s not phosphoric acid, but monohydrated phosphoric acid; I made a mistake. But this makes it even harder to estimate the solid free energy, because it contains a molecule of water of crystallization – so how do you go about estimating it? It seems that the physical properties of such a substance cannot be found either; I deleted it, and then an error was reported stating that there aren’t enough equations. . . . What should I do?
Has the original poster’s problem been solved? How did you estimate the free energy parameters? {:1_90:}
I used the ASPEN estimation module, which includes the parameter option for the free energy of solid formation. I also recommended an estimation method; it’s a fairly simple process. The results were not very different from those given in the manual for phosphoric acid, so the values turned out to be reasonably accurate. Once the calculations were completed, the results could be used. I made a mistake by confusing phosphoric acid with monohydrated phosphoric acid, which led me to think that the data couldn’t be transferred. . . . . I made a mistake myself. . . . It is now running normally.
Could the original poster help estimate the free energy of ammonium bisulfate solid when they have time? No matter how I try to set it, I can’t estimate it.:'
Check the chemical process design manual for ammonium bisulfate; it seems to be listed there. A few days ago, when I was trying to solve this problem, I came across it in the manual{:3_63:}
Thank you very much, although it’s just the free energy of the solution~~I’ll take another look
The manual also contains information on the free energy of solid formation; it’s just not certain whether there is the solid you’re looking for~
Mm-hmm, I’ve seen it. The manual mentions a solution: handshake