PREDICTION OF THE THERMODYNAMIC PROPERTIES OF SULFUR-HEXAFLUORIDE

The relative merits of two modern methods for the prediction of thermodynamic properties of fluids have been examined. Sulphur hexafluoride has been chosen as the test fluid for the study because it has a high degree of molecular symmetry and because a set of internationally-approved thermodynamic tables for the fluid is being prepared. The two prediction methods studied are the principle of corresponding states and thermodynamic perturbation theory. The efficacy of the two methods has been compared using criteria such as their accuracy with respect to experimental data and the speed and ease of implementation. Although both methods have advantages in specific regions, the simpler corresponding-states procedure is found to be superior overall. © 1990.