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Unformatted text preview: where it is seen that xB = 0.08. Analysis: (b) (continued Exercise 7.17 (continued) (3) The products are now computed by overall material balances: F = 100 = D + B and 50 = xDD + xBB = 0.96D + 0.08B. Solving these two equations, D = 47.7 mol/100 mol feed and B = 52.3 mol/100 mol feed. Analysis: (continued) (c) (1) A saturated vapor feed is fed to the reboiler. The slope of the rectifying section operating line, (L/V), is 0.9. To determine the bottoms composition, use a McCabe-Thiele diagram in terms of benzene, the more volatile component. The q-line and the rectifying section operating line are fixed and 7 trays are stepped off from the top, starting at the distillate mole fraction for benzene, xD , of 0.96. Then, the stripping section operating line is positioned by trial and error so that the reboiler stage is stepped off to arrive at the point where the assumed location of the stripping section operating line intersects the 45o line. The result is shown below, where it is seen that xB = 0.07. (2) The products are now com...
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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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