Local composition embedded equations of state for strongly nonideal fluid mixtures

1989 ◽  
Vol 28 (8) ◽  
pp. 1251-1261 ◽  
Author(s):  
Rong Jwyn Lee ◽  
Kwang Chu Chao
Keyword(s):  
Equations Of State ◽  
Local Composition ◽  
Fluid Mixtures

Backone family of equations of state: 2. Nonpolar and polar fluid mixtures

AIChE Journal ◽  
2001 ◽  
Vol 47 (3) ◽  
pp. 705-717 ◽  
Author(s):  
Ulrike Weingerl ◽  
Martin Wendland ◽  
Johann Fischer ◽  
Andreas Müller ◽  
Jochen Winkelmann
Keyword(s):  
Equations Of State ◽  
Polar Fluid ◽  
Fluid Mixtures

Local composition models for fluid mixtures over a wide density range

1987 ◽  
Vol 38 (1-2) ◽  
pp. 39-62 ◽  
Author(s):  
Keith P. Johnston ◽  
Sunwook Kim ◽  
Joseph M. Wong
Keyword(s):  
Density Range ◽  
Local Composition ◽  
Fluid Mixtures

Scaled hard-sphere equations of state for linear fused hard-sphere pure fluids and fluid mixtures

2003 ◽  
Vol 35/36 (1) ◽  
pp. 35-45
Author(s):  
Julio Largo ◽  
María Maeso ◽  
José Solana
Keyword(s):  
Hard Sphere ◽  
Equations Of State ◽  
Fluid Mixtures ◽  
Pure Fluids

Molecular Thermodynamics of Supercritical Fluid Mixtures

1983 ◽  
Vol 22 ◽  
Author(s):  
Charles A. Eckert
Keyword(s):  
Supercritical Fluid ◽  
Hard Sphere ◽  
Rational Design ◽  
Equations Of State ◽  
Selective Absorption ◽  
Fluid Mixtures ◽  
Partial Molal Volumes ◽  
Enhancement Factors ◽  
Solute Interactions ◽  
Molal Volumes

ABSTRACTSupercritical fluid extraction uses a dense gas as a solvent at a temperature only slightly above its critical temperature and a pressure of a few hundred bars. The process offers the advantages of both conventional distillation and solvent extraction, and permits the facile achievement of difficult separations by highly selective absorption and desorption of various solutes. A valid thermodynamic model is essential for the rational design of such processes. We have made extensive solubility measurements at pressures to about half a kilobar, and we interpret the results in terms of perturbed hard-sphere equations of state. In this, we characterize solution nonidealities in terms of enhancement factors, which are often in the range of 103−108. Even better information about the specific solvent-solute interactions are available from measurements of partial molal volumes in supercritical solutions. These are very difficult measurements, as the effects are most pronounced precisely where the solvent compressibility is greatest, and accurate data are possible only because of the advent of the high-pressure vibrating tube densitometer, which converts density determinations to highly accurate frequency measurements for determinations to a precision of ±0.0001 g/cc. The solute partial molal volumes are many liters negative in the critical region, and these data are interpreted in terms of various equations of state.

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