35 alternating between the equilibrium curve eq 1 and

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Unformatted text preview: perating line, Eq. (2) or (3). We begin using Eq. (2), but switch to Eq. (3), when x < xF = 0.05. The calculations are terminated when x < xB = 0.002. The calculations can be done with a spreadsheet, with the following results, given as mole fractions of A leaving an equilibrium stage. The optimal feed stage is the top plate. Equilibrium stage Partial condenser 1 2 3 4 5 6 7 8 Partial reboiler yA 0.350 0.223 0.190 0.155 0.121 0.0894 0.0626 0.0407 0.0235 0.0106 xA 0.0824 0.0458 0.0376 0.0296 0.0224 0.0161 0.0110 0.00701 0.00400 0.00178 The calculations show that besides the partial condenser and partial reboiler, 8 equilibrium stages are needed in the column. Exercise 7.23 Subject: Distillation of a mixture of methanol and water with a subcooled liquid feed. Given: Liquid feed of 14,460 kg/h methanol and 10,440 kg/h water at q = 1.12. Distillate of 99 mol% methanol and a bottoms of 99 mol% water are desired. Column has a total condenser and a partial reboiler. Operation at 1 atm wit...
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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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