101711_D9 and D11

101711_D9 and D11 - D 6. We are separating a mixture o f a...

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D6. We are separating a mixture of acetone and ethanol in a distillation column operating at one atmosphere pressure. The column has a total condenser and a partial reboiler . . The distillate is 90 mol%-acetone, and the bottoms is 10 mol% acetone. The reflux is returned as a saturated liquid. Use a boilup ratio of V/B = 2.0. Two feeds are fed to the column. The first feed has a flow rate of 75 kmollh, it is a saturated liquid, and it is 60 . mol% acetone. The second feed has a flow rate of 100 kmollh, it is a two-phase mix- ture that is 60% vapor, and it is 40 mol % acetone. Use the optimum feed location for each feed. Assume CMO. Equilibrium data are in Problem 4.D7. a. Find the distillate and bottoms flow rates, D and B. b. Plot the two feed lines and the three operating lines. c. Step off stages and find the optimum feed location for each feed stream and the total number of equilibrium stages required. D7.* a. A distillation column with a total condenser is separating acetone from ethanol. A distillate concentration of x D = 0.90 mole fraction acetone is desired. Since CMO is valid, LlV = constant. If LlV is equal to 0.8, find the composition of the liquid leav- ing the fifth stage below the total condenser. b. A distillation column separating acetone and ethanol has a partial reboiler that acts as an equilibrium contact. If-.!.he bottoms composition is x B = 0.13 mole fraction acetone and the boilup ratio V IB = 1.0, find the vapor composition leaving the sec- ond stage above the partial reboiler. c. The distillation column in parts a and b is separating acetone from ethanol and has = 0.9, x B = 0.13, LlV = 0.8, and V/B = 1.0. If the feed composition is z = 0.3 (all x D concentrations are mole fraction of more volatile component), find the optimum
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This note was uploaded on 12/29/2011 for the course CHE 128 taught by Professor Scott,s during the Fall '08 term at UCSB.

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101711_D9 and D11 - D 6. We are separating a mixture o f a...

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