3 replies to this topic

[ChinmoyBasak]

Hello everyone, I'm currently working on a project that involves simulating the thermodynamics of a chemical process using Aspen Plus. I'm wondering if anyone has experience using external thermodynamic models in Aspen Plus, and if so, could you share some tips or resources on how to do it effectively?

Specifically, I'm interested in using an external model to calculate the properties of non-ideal systems, such as solid-liquid equilibria. I understand that Aspen Plus comes with built-in models, but I'm hoping to use an external model that may provide more accurate or detailed results.

Any advice or guidance on this topic would be greatly appreciated. Thank you in advance

[latexman]

I have no experience using external thermodynamic models in Aspen Plus.  I do have over 20 years using their internal thermodynamic models.  When selecting from the available internal thermodynamic models in Aspen Plus, I do take care, and always run their Methods Assistant in Properties/Specifications - Methods/Global.  I have used methods to support from simple/ideal to ionic to rigorous VLLE simulations.  I don't recall a time when I thought Aspen Plus's internal thermodynamic models were not up to the challenge.  I've always thought their methods were one of the reasons for their success.  So, I am curious, why are you looking at using external thermodynamic models in Aspen Plus?  I would give their internal methods a go at it first.

[ChinmoyBasak]

Thank you for your answer, and I apologize for the delay. I am currently working with a highly concentrated electrolyte system. According to a research paper, both the eNRTL (which underpredicts) and Pitzer (which overpredicts) models are unable to accurately simulate properties beyond a concentration of 6M. That is why I was attempting to use an experimental model to simulate the behavior. I tried regression, but the results did not match at different temperatures, which led me to consider a completely different model. I may be wrong.

[latexman]

Good luck.