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Unformatted text preview: ss balance: 158.22 = D + B (1) Overall benzene mass balance: 69.65 = 0.974D + 0.240B (2) Solving Eqs. (1) and (2): D = 43.16 kmol/h B = 115.06 kmol/h By weight, D = 43.16[0.974(78.11) + 0.026(92.13)] = 3,387 kg/h Analysis: (a) (continued) Exercise 7.15 (continued)
McCabe-Thiele Diagram Exercise 7.16
Subject: Effect on the separation of A from B by distillation when 3 of 7 theoretical plates rust and drop to the bottom of the column. Given: . Column has 7 theoretical plates + partial reboiler. Saturated liquid feed of 100 kmol/h of 50 mol% A is sent to plate 5 from the top. Distillate contains 90 mol% A. The L/V = 0.75 in the rectifying section. Vapor-liquid equilibrium data. Assumptions: Constant molar overflow. Total condenser. Find: Case 1: Column before the 3 plates rust and drop. (a) Composition of the bottoms product. (b) The L/V in the stripping section. (c) The kmol/h of bottoms product. Case 2: If plates 5, 6, and 7 counted down from the top are lost: (a) Composition of bottoms product. Case 3: Same as Cas...
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