Developed from the Redlich–Kwong–Soave EOS, this EOS  gives better vapour pressure and density results for many petrochemical compounds. For this class of compounds even caloric data are represented rather well.
For heavy alkanes an update of this EOS is available, referred to as PR78 on this website .
The critical compression factor of this EOS is fixed. It is not possible for this EOS to match all 3 critical conditions.
adjustable parameters: 3
For mixture calculations the following mixing theories are available:
 D. Y. Peng and D. B. Robinson, Ind. Eng. Chem. Fundam. 15 (1976) 59–64.
 D. B. Robinson and D. Y. Peng, GPA Research Report RR-28 (1978), 1–36.
 J.-W. Qian, R. Privat, and J.-N. Jaubert, Ind. Eng. Chem. Res. 52 (2013) 16457–16490.
 J.-W. Qian, R. Privat, J.-N. Jaubert, C. Coquelet, Ramjugernath, D.. Int. J. Refrig. 73 (2017), 65–90.
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