Solvatochromic parameters and solubilities in supercritical fluid systems

1993 ◽  
Vol 71 (11) ◽  
pp. 1834-1840 ◽  
Author(s):  
Mark L. O'Neill ◽  
Peeter Kruus ◽  
Robert C. Burk
Keyword(s):  
Supercritical Fluid ◽  
Supercritical Fluids ◽  
Spectroscopic Studies ◽  
Solvatochromic Parameters ◽  
Solubility Prediction ◽  
Fluid Systems ◽  
Supercritical Fluid Solvents ◽  
Opposite Order ◽  
Solvent Systems ◽  
Solvent Power

Spectroscopic studies of the compound 2-nitroanisole in supercritical fluids CO2 and N2O show that π* values vary linearly with density. The solubility trends in these single component supercritical fluid solvents qualitatively followed the trends in solvent power predicted from π*. However, the relative solvent power predicted for CO2 and N2O based on π* resulted in an opposite order to what was determined experimentally through solubility measurements. The π* parameter may be of some use for solubility prediction if only a limited set of solute–solvent systems are considered. Measurements of π*, especially those in binary supercritical fluid solvents, suggest that π* could be a valuable tool for probing the solute-organized cybotactic region.

Molecular thermodynamics of solute-polymer-supercritical fluid systems

AIChE Journal ◽  
1991 ◽  
Vol 37 (4) ◽  
pp. 607-616 ◽  
Author(s):  
Jae-Jin Shim ◽  
Keith P. Johnston
Keyword(s):  
Supercritical Fluid ◽  
Molecular Thermodynamics ◽  
Fluid Systems

Generation and Propagation of Thermally Induced Acoustic Waves in Supercritical Fluids: Numerical and Experimental Results

2010 ◽  
Author(s):  
Bakhtier Farouk ◽  
Zhieheng Lei
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Fluid ◽  
Supercritical Fluids ◽  
Acoustic Waves ◽  
Rapid Heating ◽  
Time Dependent ◽  
Cylindrical Chamber ◽  
Thermally Induced ◽  
Supercritical Carbon

The behavior of thermally induced acoustic waves generated by the rapid heating of a bounding solid wall in a closed cylindrical chamber filled with supercritical carbon dioxide is investigated numerically and experimentally. A time-dependent one-dimensional problem is considered for the numerical simulations where the supercritical fluid is contained between two parallel plates. The NIST Reference Database 12 is used to obtain the property relations for supercritical carbon dioxide. The thermally induced pressure (acoustic) waves undergo repeated reflections at the two confining walls and gradually dissipate. The numerically predicted temperature of the bulk supercritical fluid is found to increase homogeneously (the so called piston effect) within the domain. The details of generation, propagation and dissipation of thermally induced acoustic waves in supercritical fluids are presented under different heating rates. In the experiments, a resistance-capacitance circuit is used to generate a rapid temperature increase in a thin metal foil located at one end of a closed cylindrical chamber. The time-dependent pressure variation in the chamber and the temperature history at the foil are recorded by a fast response measurement system. Both the experimental and numerical studies predict similar pressure wave shapes and profiles due to rapid heating of a wall.

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