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Unformatted text preview: reboiler increases the distance between the equilibrium curve and the operating lines for Sections 2 and 3 so that the steps in Sections 2 and 3 accomplish larger composition changes. Exercise 7.38 (continued)
Analysis: Addition (continued) Exercise 7.39
Subject: Distillation of a mixture of para-dichlorobenzene (P) and ortho-dichlorobenzene (O), two close-boiling isomers, using the McCabe-Thiele diagram, with the Kremser equation to accurately calculate the separations at the two ends of the column. Given: Feed of 62 mol% P and 38 mol% O that is slightly vaporized with q = 0.9. Distillate is liquid of 98 mol% P. Bottoms is 96 mol% O. Pressures at top and bottom are 20 psia and 15 psia, respectively. Reflux ratio, R = 1.15 times minimum. Assumptions: Constant molar overflow. Total condenser and partial reboiler. Average relative volatility based on Raoult's law. Find: Number of theoretical stages from McCabe-Thiele diagram, using Kremser supplement for the two ends of the column. Analysis: From a simulation program or handbook, the temperatures at the top and...
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