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CPA is a equation of state that has attracted some interest from the oil industry.
Is is made by combining the SRK EOS with the associating term.
This results in a model that can handle far more complex fluids then the original SRK model.
2 mixing rules are defined for the association term in CPA:
•CR1 or Auto
The literature gives more information on the 2 mixing rules
For non-associating components 3 parameters are fitted to vapor pressure and density while for associating components 2 extra parameters are fitted.