By Maria Dolores Luque Castro; Miguel Valcarcel Cases; M T Tena
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Additional info for Analytical Supercritical Fluid Extraction
An accurate knowledge of the position of the critical point for a given mixture composition is of great significance with a view to developing procedures involving binary mixtures. g. CO 2) modified by an organic solvent. The computations involved are based on the modified Handinson-Brobst-Thomson equation .
The following sections discuss the influence of pressure and temperature on several essential properties of supercritical fluids, namely: density, diffusivity, viscosity and dielectric constant. 1 Density The density of a supercritical fluid is markedly dependent on its pressure and temperature. 0 REDUCED PRESSURE (P, = P/Pcl Fig. 9. Two-dimensional reduced densityreduced pressure graph including several reduced temperature isotherms. CP = critical point. (Reproduced with permission of Butterworth) at a constant temperature (an isotherm) is typically non-linear.
The close relationship between solubility and density Triple intersection Solute-solvent interaction 44 Pure fluids Binary fluids Physico-Chemical Properties of Supercritical Fluids is discussed in detail in Chap. 3. At a given, constant temperature, dissolution of non-polar and scarcely polar analytes will be favoured by low pressures, whereas that of polar and high-molecular weight solutes will be easier at high pressures. This allows the sequential extraction of groups or families of similar compounds, which is dealt with in detail in Chap.
Analytical Supercritical Fluid Extraction by Maria Dolores Luque Castro; Miguel Valcarcel Cases; M T Tena