**C1.** Derive Eq. (8-7) for the two-column, binary, heterogeneous azeotrope system.

**C2.** An equation for α_{org–w in w} similar to Eq. (8-13) is easy to derive; do it. Compare the predicted equilibrium in water with the butanol-water equilibrium data given in Problem 8.D2. Comment on the fit. Vapor pressure data are in Perry and Green (1984). Use the data in Table 8-2 for solubility data.

**C3.** For a binary heterogeneous azeotrope separation, the feed can be introduced into the liquid-liquid separator. In this case two stripping columns are used.

**a.** Sketch the column arrangement.

**b.** Draw the McCabe-Thiele diagram for this system.

**c.** Compare this system to the system in Figure 8-3A.

**C4.** Sketch the McCabe-Thiele diagram for a two-pressure ...

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