PRODE extended five parameters EOS (Peng Robinson, Soave Redlich Kwong, Cubic Plus As

[tmander]

with release 1.2 of Base version of PRODE PROPERTIES
the extended versions of Peng Robinson, Soave Redlich Kwong and Cubic Plus Association
include five parameters for each compound
(previously the five parameters were not available in base version)
(Cubic Plus Association has 7 parameters to include Association term)

have you compared the three parameters version vs. five parameters version ?
Does the five parameters version allow more accuracy on VLE / enthalpy / density values ?

[cmarc]

yes, I have compared values for densities (volume)
and enthalpies of (polar) fluids and mixtures,
on absolute values the results are more accurate
than three parameters version,
however as noticed on a different post,
for derivatives (vs. pressure, temperature) you
may expect much larger errors
(this is quite usual but one must know)