I'm using piperazine in a simulation in Aspen plus, however I think that the database doesn't have all property characteristics of PZ. Is there an updated database or does Aspen provide them separately from the software (I'm using version 8)?
It is possible to predict the standard Gibbs free energy of formation based on the structure i.e. functional group methods such as Joback (1984), Constaninou and Gani (1994) or Benson (encoded in CHETAH). Joback is probably the least complex to implement on spreadsheet.
Also, I believe it may be available in Aspen Plus. See around P38 of the article in the link below:
http://www.just.edu.jo/~yahussain/files/Thermodynamic%20Models.pdf
The methods are explained in Properties of Gases and Liquids (5th Ed) Poling, Prausnitz and O'Connell.
See also NIST Special Database 16. CHETAH - Chemical Thermodynamic and Energy Release Program, Version 7.2 | NIST
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