Davood Heydari - Iranian Aerospace Organization, Tehran, Iran
Reza Ghiai - Iranian Aerospace Organization, Tehran, Iran
Akbar Afshar Asl - Iranian Aerospace Organization, Tehran, Iran

An accurate improved correlation has been developed for the density of liquid nitrogen tetroxide (N2O4). The correlation is applicable over a wide range of temperatures (from boiling point up to critical temperature) and pressures (atmospheric up to 400 bar). The proposed improved correlation is derived of Chueh – Prausnitz model. This proposed model is using saturated density or molar volume, ρs or Vs, in the Hankinson - Thomson model. Ability of this model are compared to other models and showed. When tested against a data base of 129 points of liquid density for nitrogen tetroxide, the proposed correlation gave an average absolute errors (AAD %) of 0.492% compared to 6.472, 6.428, 1.908, 2.888, 4.644, 3.400 and 1.72 percent for Soave-Redlich-Kwong EOS, Peng-Robinson EOS, Aalto-Chang-Zhao, Aalto-Keskinen, Chueh – Prausnitz, Hankinson-Brobst-Thomson and yen-Woods models respectively.

Nitrogen tetroxide; Saturated Liquids, Compressed Liquids; Density