0 thus the minimum feed rate 100 kmolh under these

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Unformatted text preview: 00 kmol/h. Under these conditions, no bottoms product is withdrawn and the reboiler performs as a total reboiler. The vapor leaving the top of the column has the same composition as the feed. Therefore, we consider only a total of 8 equilibrium stages. In the McCabe-Thiele diagram below, the stripping section operating line is coincident with the 45o line. The 8 stages are stepped off from the top at y = 0.36 and x = 0.36. The mole fraction of benzene in the reboiler is found to be 0.008 from the low concentration region plot. Therefore, the corresponding toluene mole fraction = 0.992, which is quite pure. Note that 2 diagrams below are used, with the second, covering the stages at the bottom of the column in the low concentration region. To obtain accuracy in this low-end region, the vaporliquid equilibrium data for x = 0.1 and x = 0.2 were fitted to a quadratic equation passing through the origin, with the result, y = 2.35x - 2.5x2 . Analysis: (a) (continued) Exercise 7.18 (continued) Analysis: (continued)...
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