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

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16.7.1 Mass-Transfer Equations and HTU-NTU Analysis

The transfer rate/volume in (kg A)/(s m3) [or (kmol A)/(s m3)] to or from the dispersed phase is

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(16-80a)

In these equations xD is the weight or mole fraction of the solute A in the dispersed phase, and x*D is the weight or mole fraction that would be in equilibrium with the continuous-phase fraction of A, xC. Note that xD may refer to either raffinate or extract, which is different than the notation in Table 13-2. Determination of “a,” the area/volume (m2 dispersed phase/m3 total volume of mixer) for mass transfer, is discussed in Section 16.7.3. The units of KO-ED are (kg solute A in dispersed ...

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