Unformatted text preview: , where benzene mole fractions are plotted because it is the more volatile component. It is seen that for benzene, xD = 0.90 and xB = 0.28. Exercise 7.14 (continued)
McCabe-Thiele Diagram Exercise 7.15
Subject: Effect of loss of plates in a distillation column separating a benzene-toluene mixture. Given: Saturated vapor feed of 13,600 kg/h of 40 wt% benzene and 60 wt% toluene. Column with 14 plates above the feed location. Plate efficiency is 50%. Reflux ratio is 3.5. Previously, with 10 plates in the stripping section, column could achieve a distillate of 97 wt% benzene and a bottoms of 98 wt% toluene. Vapor-liquid equilibrium data in Exercise 7.13. Assumptions: Constant molar overflow. Total condenser and partial reboiler. Find: (a) If column with 10 inoperable plates can yield a distillate of 97 wt% benzene, assuming that we no longer can achieve the 98 wt% bottoms product. (b) The distillate flow rate. (c) The composition of the bottoms. Analysis: (a) First convert the feed to kmol/h and mole fractions, using molecular weights of 78.11 for benzene an...
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