Riazi-Daubert Methods:
Follwing simplified formula can be used to calculate critical volume of hydrocarbons:
For range C5-C20:
Vc = 1.7842 x 10^{–4 }T^{2.3829} SG^{–1.683}
For C20 and heavier:
Vc = 6.2 x 10^{10} x [ exp (-7.58 x 10^{-3 }T_{b }- 28.5524 x SG + 1.172 x 10^{-2 }T_{b }SG)] T_{b}^{1.20493 }SG^{17.2074} (Use for
where Vc is in cma/mol and Tb is in kelvin.