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

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15.4.2 Transfer through Stagnant Films: Absorbers and Strippers

For absorbers and strippers (Section 16.4), the film model is often used. We again postulate a film of thickness δ, which has mass transfer by diffusion only. This is shown in Figure 15-6 for absorption with mass transfer of solute A in the gas-phase controlling. In absorption the carrier gas B often does not absorb; thus, there is a stagnant layer of B, NB = 0. Then, from Eq. (15-19),

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(15-32a)

Figure 15-6. Film model for absorption with gas-phase mass-transfer controlling

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