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

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13.12 Minimum Solvent Rate for Partially Miscible Systems

As the solvent rate is increased, the separation should become easier, and the outlet extract stream, EN, should become more diluted. The effect of increasing S/F is shown in Figure 13-28. As S/F increases, the mixing point moves toward the solvent and the solute concentration in stream EN decreases. Starting with a low value of S/F, the difference point starts on the right-hand side of the diagram (Rj+1 > Ej) and moves away from the diagram as S/F increases. When Rj+1 = Ej, Δ is at infinity. A further increase in S/F puts Δ on the left-hand side of the diagram (Rj+1 < Ej). It now moves toward the diagram as S/F continues to increase. Some of these S/F ratios will be too low, and even ...

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