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Binary Interaction Parameters For Mixtures


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#1 Guest_rgpelexcelente_*

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Posted 18 October 2004 - 08:05 PM

Hello All wink.gif ,

Do you have any experience in comparing the use of binary
interaction parameters of activity coefficient methods in
multicomponent mixtures.

I was wondering if the use of BIPs would cause some errors in the
computation of a multicomponent mixture because the BIPs were
measured for a single pair and not in such mixture.
unsure.gif
Please advise.

Regards,

Roberto.

P.S: Do you happen to know any paper discussing this topic?

#2 siretb

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Posted 20 October 2004 - 08:06 AM

As long as the binary paprameters are given for the same service (avoid as much as possible to mix a pair of parameters given for LL with a pair given for VL) it works fine and I never had any major problem with miluticomponents.
Be a bit careful if some parameters are outside of the usual range; for exemple Renon NRTL alpha parameter should be around 0.2-0.3. It is possible to see values well beyond this range. It can mean that a regression program has found a mathematical optimum there, but devoid of physical meaning.
To sum up, it works, bur exercice judgement before blending sets of paramerters




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