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

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8.2.1 Binary Heterogeneous Azeotropes

Although not common, there are systems such as n-butanol and water, which form a heterogeneous azeotrope (Figure 8-2). Figures 8-2A and 8-2B plot the same data, but for different components. When the vapor of the azeotrope with mole frac yaz is condensed, a water-rich liquid phase α and an organic-rich liquid phase β separate from each other. You should feel comfortable converting from Figure 8-2A to 8-2B, and vice versa.

Figure 8-2. Heterogeneous azeotrope system, n-butanol and water at 1 atmosphere (Chu et al., 1950). (A) Plotted as butanol mole fractons. (B) Plotted as water mole fractions.

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