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4. Calculate the limiting vapor and liquid flows for each section using Eqs. (2.54c), (2.54gD, (2.55c), and (2.55cf). Use these to determine the slopes of the component balance lines.

Le = 89.9(1.0 - 0.043) = 86.0 Ve - 149.8(1.0 - 0.26) = 110.9 L'e = 123.9(1.0 - 0.23) - 95.4 Ve = 83.8(1.0 - 0.063) = 78.5 Rectifying section slope = LJVe = 86.0/110.9 = 0.776 Stripping section slope ยป LjVe = 95.4/78.5 = 1.215

Equilibrium curves. To establish the equilibrium curve for the key components, Hengstebeck (15) recommends that the relative volatilities of the key components be determined at the bottom product bubble-point temperature and at the overhead product dew-point temperature. If these top and bottom values differ by less than 10 percent, the equilibrium curve is drawn from Eq. (1.4), that is,

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