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

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13.3 Dilute Fractional Extraction

Very often, particularly in bioseparation, extraction is used to separate solutes from each other (Belter et al., 1988; Frank et al., 2008; Schiebel, 1978). In this situation we can use fractional extraction with two solvents as illustrated in Figure 13-5. In fractional extraction the two solvents are chosen so that solute A prefers solvent 1 and concentrates at the top of the column, while solute B prefers solvent 2 and concentrates at the bottom of the column. In Figure 13-5 solvent 2 is labeled as diluent so that we can use the nomenclature of Table 13-2. The column sections in Figure 13-5 are often separate so that each section can be at a different pH or temperature. This will make the equilibrium curve ...

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