Read e-book online Analytical Supercritical Fluid Extraction PDF

By Maria Dolores Luque Castro; Miguel Valcarcel Cases; M T Tena

ISBN-10: 3642786731

ISBN-13: 9783642786730

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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 [17].

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.

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Analytical Supercritical Fluid Extraction by Maria Dolores Luque Castro; Miguel Valcarcel Cases; M T Tena

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