Aspen property method approach and model data regression: examples of empirical data sharing
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Sharing of experience data on the methodology, model development, and data regression for Aspen material properties – everyone should share what they have done. For example, in a forum post calculating the freezing point of a methanol-water mixture using the NRTL method, it is necessary to modify the PHIS property route to PHIS06. Wait, this post was last edited by fang_yanchen on 2009-2-23 12:39.]
When using the nrtl method, the calculation route for the enthalpy of pure substances relies on HL00; this route yields quite inaccurate values for the specific heat of pure substances. You can switch to HL14, and the results will then be correct.
When calculating density, the volume of the liquid phase is sometimes calculated using the API method and sometimes with other methods; we know that the API method is independent of the mixing rules. A certain substance was once used; when calculating its density for the pure form, the value was fairly similar to that given in the manuals. However, when calculating the density of this substance with a purity of 99.9%, there was a significant difference from the density of the pure form. The mixing rules were taken into account when calculating the volume of the liquid phase, which is why the calculations were inaccurate. Using API for the calculations yielded much more accurate results.
Great stuff, thanks to the original poster for sharing it – what a kind person! ! !
This post was last edited by Necessary solitude on 2017-8-14 20:48; choose the appropriate method based on the actual situation