18.6 Mass and Energy Transfer in Packed Beds

For detailed predictions and understanding of sorption separations we need to do a detailed analysis of diffusion rates, mass and energy transfer, and mass and energy balances in the column. In order to make the results somewhat tractable, we will make all the usual assumptions listed in Table 18-6.

Table 18-6. Assumptions for mass and energy transfer analysis

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The fluid flowing in the external void volume in Figure 18-1 is usually assumed to have a constant concentration (or partial pressure) at each axial distance z; thus, this bulk concentration is not a function of the radial distance from the center ...

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