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

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8.6 Extractive Distillation

Extractive distillation is used for the separation of azeotropes and close-boiling mixtures. In extractive distillation, a solvent is added to the distillation column. This solvent is selected so that one of the components, B, is selectively attracted to it. Since the solvent is usually chosen to have a significantly higher boiling point than the components being separated, the attracted component, B, has its volatility reduced. Thus, the other component, A, becomes relatively more volatile and is easy to remove in the distillate. A separate column is required to separate the solvent and component B. The residue curves, after the solvent is added, are shown in Figure 8-7 (separation of close boiling components) and ...

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