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

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16.7 Mass-Transfer Analysis of Extraction

One would expect that mass-transfer analysis of extraction would be very similar to the analysis of absorption and stripping (Section 16.4). However, there are significant differences, such as the frequent use of ratio units (Section 13.5), because they extend the region of validity of the analysis. Although an analysis similar to absorption with individual mass-transfer coefficients and concentrated analysis can be used, in practice the overall mass-transfer coefficient KO-ED and the simplest form for NTU are used (Frank et al., 2008; Treybal, 1980). The analysis is kept simple because of large uncertainties in the mass-transfer data (discussed later). After developing the HTU-NTU analysis in Section ...

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