Prediction of binary and ternary critical properties using deiters' equation, hard sphere and hard convex body equations of state

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Title: Prediction of binary and ternary critical properties using deiters' equation, hard sphere and hard convex body equations of state
Author(s): Mainwaring, David E.; Sadus, Richard J.; Young, Colin L.
Abstract: The use of recently developed equations of state for critical phenomena is examined. Deiter's equation is incapable of accurately predicting the gas-liquid critical properties of mixtures of dissimilar size molecules whereas a hard convex body equation does not yield significantly better results than asimple hard sphere equation. In many cases a 'hard sphere + attractive term' equation can predict the critical properties of Type II mixtures to within experimental error. This conclusion is valid for a wide range of component molecules. However, an adjustable parameter is usually required to optimize agreement. Type II liquid-liquid properties can also be accurately calculated but the same precision can not be obtained for Type III phenomena. Some calculations for CHF3 + alkane mixtures are reported which exhibited Type III behavior. In this work the critical properties of CF4+CHF3+CH4 over a wide range of temperature and pressure and calculated. The results illustrate the potential of theory to classify the phase behavior of ternary mixtures.
Publication type: Journal article
Research centre: Swinburne Institute of Technology. Centre for Applied Colloid Science
Source: Fluid Phase Equilibria, Vol. 42 (Aug 1988), p. 85-103
Publication year: 1988
Keyword(s): Deiter's equation; Hard sphere equation of state; Equations of state
Publisher: Elsevier
ISSN: 0378-3812
Publisher URL: http://dx.doi.org/10.1016/0378-3812(88)80051-7
Peer reviewed