(a) For the cascade shown in Figure a, calculate the compositions of streams V4 and L1. Assume...

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(a) For the cascade shown in Figure a, calculate the compositions of streams V4 and L1. Assume atmospheric pressure, saturated liquid and vapor feeds, and the vapor-liquid equilibrium data given below. Compositions are in mole percent.

(b) Given the feed compositions in cascade (a), how many equilibrium stages are required to produce a V4 containing 85 mol% alcohol?

(c) For the cascade configuration shown in Figure b, with D = 50 mol, what are the compositions of D and L1?

(d) For the configuration of cascade (b), how many equilibrium stages are required to produce a D of 50 mol%alcohol?

EQUILIBRIUM DATA, MOLE-FRACTION ALCOHOL 0.3 0.5 0.9 0.1 0.5 0.68 0.7 0.82 0.2 0.94

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