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

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18.2.2 Solute Movement Theory for Linear Isotherms

The theory becomes simplest when the linear isotherm, Eq. (18-5b) or (18-6b), is used. Since almost all equilibrium data becomes linear at low enough concentrations or partial pressures, there are a number of real applications of linear isotherms.

When Eq. (18-6b) is valid, Image, and Eq. (18-13) becomes

Image

(18-15a)

for any adsorbate i. Note that none of the terms depend upon the concentration of adsorbate i. Thus, at low concentrations where the linear isotherm is valid the solute velocity becomes constant. ...

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