Your plant feeds 100.0 kmol/h of a mixture that is 46.0 mol% ethanol and 54.0 mol% water to a flash drum. Your boss thinks that results will be better with two flash drums (same configuration as in problem 2.D2) with V₁ = 30.0 kmol/h and V₂ = 30.0 kmol/h.

Data From problem 2.D2

D2.* Two flash distillation chambers are hooked together as shown in the diagram. Both are at 1 atm pressure. The feed to the first drum is a binary mixture of methanol and water that is 55.0 mol% methanol. Feed flow rate is 10,000 kmol/h. The second flash drum operates with (V/F) 2 = 0.70 and the liquid product composition XM,2 = 0.250. Equilibrium data are given in Table 2-8.

1. For the two-drum configuration, find L₁, L₂, and x₂.

2. Compare x₂ to the liquid mole fraction from a single flash drum with V/F = 0.60.

a. For the two-drum configuration, find L₁, L₂, and x_2.

b. Compare x₂ to the liquid mole fraction from a single flash drum with V/F 0.60.

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TABLE 2-8. Vapor-liquid equilibrium data for methanol water (p = 1 atm) (mol %) Methanol Liquid Methanol Vapor Temp., C 0 0 100 20 2.0 13.4 96.4 4.0 23.0 93.5 6.0 30.4 91.2 8.0 36.5 89.3 10.0 41.8 87.7 15.0 51.7 84.4 20.0 57.9 81.7 30.0 66.5 78.0 40.0 72.9 75.3 50.0 77.9 73.1 60.0 82.5 71.2 70.0 87.0 69.3 80.0 91.5 67.6 90.0 95.8 66.0 95.0 97.9 65.0 100.0 100.0 64.5