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How Can I Change The Interaction Parameter For Unifac And Nrtl To Get

aspen plus unifac nrtl interaction parameter

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#1 Mehrbod

Mehrbod

    Brand New Member

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Posted 01 October 2012 - 11:31 PM

I am trying to find thermodynamic model for Triolein, oleic or Stearic Acid and Ethanol, Liquid liquid equilibria in Aspen Plus. after importing molecular structure for them and add some equilibrium data from articles and also importing critical properties and Antoine equation for Triolein.
I changed the property model to NRTL, and Also UNIFAC.

after investigation I saw NRTL has around 15-20% deviation from data that given by Batista.
"http://pubs.acs.org/....1021/je9900169"
and the result for UNIF-LL has to much deviation from his data.

Which parameter should change to get the better result? and How can I add new UNIFAC group interaction parameters to aspen plus.
Thanks for your advice

Edited by Mehrbod, 11 October 2012 - 01:56 PM.


#2 mohagheghfard

mohagheghfard

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Posted 19 October 2012 - 01:54 PM

Mehrbod,
Generally Hyop components are based upon some limited information of them like molecular structure and almost using the commercial simulation softwares like aspen, create considerable deviatiuon and the results not enough reliable that's why licensors develops their own in-house softwares. If you give more details, we may proceed more.
Rgds,




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