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.

scholarly journals Equations of State for Hard-Sphere Chains

1996 ◽  
Vol 100 (2) ◽  
pp. 928-928
Author(s):  
Richard J. Sadus
Keyword(s):  
Hard Sphere ◽  
Equations Of State

Thermodynamic properties of liquid mixtures: Selection of the pure liquid parameter

1974 ◽  
Vol 27 (3) ◽  
pp. 647 ◽  
Author(s):  
DV Fenby ◽  
NF Pasco
Keyword(s):  
Equation Of State ◽  
Thermodynamic Properties ◽  
Equations Of State ◽  
Liquid Mixtures ◽  
Pure Liquid ◽  
Excess Thermodynamic Properties ◽  
Pure Fluids ◽  
Liquid Parameter ◽  
Selection Of

There has recently been a revival of interest in theories of liquid mixtures based on analytic equations of state for pure fluids. We have shown that the method used to determine the parameters of the pure-liquid equation of state has a significant effect on the excess thermodynamic properties obtained from such theories.

Phase stability of dense multicomponent charged and uncharged hard‐sphere fluid mixtures

1993 ◽  
Vol 98 (2) ◽  
pp. 1579-1587 ◽  
Author(s):  
C. Caccamo ◽  
M. Varisco ◽  
M. A. Floriano ◽  
E. Caponetti ◽  
R. Triolo ◽  
...  
Keyword(s):  
Phase Stability ◽  
Hard Sphere ◽  
Fluid Mixtures ◽  
Hard Sphere Fluid

Maximum‐entropy approach to classical hard‐sphere and hard‐disk equations of state

1991 ◽  
Vol 32 (8) ◽  
pp. 2258-2262 ◽  
Author(s):  
D. Wang ◽  
L. R. Mead ◽  
M. de Llano
Keyword(s):  
Maximum Entropy ◽  
Hard Sphere ◽  
Equations Of State ◽  
Hard Disk
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