However the reboiler is assumed to have a 100

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Unformatted text preview: re required plus the partial reboiler. The feed plate is 4 from the top. Analysis (continued) Exercise 7.26 (continued) Exercise 7.27 Subject: Distillation of carbon disulfide and carbon tetrachloride. Given: Partially vaporized feed (q = 0.5) of 40 mol% CS2. Operation with a reflux ratio, L/D, of 4 and a Murphree vapor efficiency of 80%. Partial reboiler and total condenser. Vapor-liquid equilibrium data. Assumptions: Constant molar overflow. Find: For a distillate of 95 mol% CS2 and a bottoms of 5 mol% CS2, determine: (a) Minimum reflux ratio, minimum boilup ratio, and minimum number of stages. (b) Number of trays. Analysis: (a) In the McCabe-Thiele plot on the next page, rectifying section and stripping section operating lines are shown for determining minimum reflux and boilup ratios. Note that the q-line has a slope given in Eq. (7-26) as q/(q - 1) = 0.5/(0.5 - 1) = -1 and intersects the point {0.4, 0.4}. The rectifying section operating line intersects the point {0.95, 0.95} and the point where the...
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This note was uploaded on 09/08/2008 for the course CHE 244 taught by Professor Selebi during the Spring '06 term at Lehigh University .

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