Peng rob eos binary parameters

[mariorossi1983]

Hi everybody,
I have just been registered into the Forum right now and I will be happy to actively participate to the Forum discussions!
I have a problem with PengRobinson EoS.
I would like to employ standard PR EoS for mixtures with arithmetic mean mixing rule for covolume and binary interaction parameter (bij = (bi+bj)/2*(1-etaij)). Just, I realized, that binary interaction parameter (Kij) is available only for attractive parameter (a) and binary parameter is provided for covolume. I was wondering, if there is any method/route combination to implement the above mentioned mixing rule for b in Aspen or, alternatively, if you could indicate how to set-up a fortran subroutine to calculate it.

Thank you in advance

Cheers

[jackofalltrades]

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