Modeling the thermodynamic behavior of poly(lactide-co-glycolide)+supercritical fluid mixtures with equations of state

2006 ◽  
Vol 244 (1) ◽  
pp. 16-25 ◽  
Author(s):  
Pedro Arce ◽  
Martín Aznar
Keyword(s):  
Supercritical Fluid ◽  
Equations Of State ◽  
Fluid Mixtures ◽  
Thermodynamic Behavior

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.

Thermodynamic behavior of supercritical fluid mixtures

1986 ◽  
Vol 7 (2) ◽  
pp. 231-243 ◽  
Author(s):  
J. M. H. Levelt Sengers ◽  
G. Morrison ◽  
G. Nielson ◽  
R. F. Chang ◽  
C. M. Everhart
Keyword(s):  
Supercritical Fluid ◽  
Fluid Mixtures ◽  
Thermodynamic Behavior

Low temperature extraction and upgrading of oil sands and bitumen in supercritical fluid mixtures

2010 ◽  
Vol 46 (27) ◽  
pp. 4923 ◽  
Author(s):  
Sarah A. Brough ◽  
Sandra H. Riley ◽  
G. Sean McGrady ◽  
Supaporn Tanhawiriyakul ◽  
Laura Romero-Zerón ◽  
...  
Keyword(s):  
Low Temperature ◽  
Supercritical Fluid ◽  
Oil Sands ◽  
Fluid Mixtures ◽  
Low Temperature Extraction
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