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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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18.1.1 Definitions

The most common contacting device for adsorption, chromatography, and ion exchange is the packed bed shown schematically in Figure 18-1. The particles are packed in the cylindrical column of cross-sectional area Ac and the length of the packed section is L. Some type of support netting or frit is used at the bottom of the packed section and a hold down device such as a net or frit is used at the top of the packed section. Figure 18-1 illustrates a number of important variables. The external porosity εe is the fraction of the column volume that is outside the particles. To some extent the value of εe depends on the shape of the particles (e.g., εe is smaller for spheres than for irregular shaped particles) and the packing procedure ...

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