What factor(s) would you consider in recommending one of these columns over the other? Assume that the packed column operates at 70% of flooding and contains 1.5 in Berl saddles.ĭ. Determine the height of a packed column to perform this separation. Estimate the height (ft) of a tray tower to perform this separation.Ĭ. Determine the number of equilibrium stages and the actual number of stages. Determine the liquid flow rate (lbmol/hr) and the mole fraction of ammonia in the liquid leaving the column.ī. The equilibrium relationship is linear with y/x = 0.85. The mole fraction of ammonia in the effluent gas must be less than 0.000001. The water entering the column contains no ammonia. Water is to be used to remove ammonia from an air stream containing 1% ammonia by volume. Which direction (vapor to liquid or liquid to vapor) is the ethanol transferring as you move up the column? Would an overall mass transfer coefficient been a good choice for this problem? Why or why not? (Hint‐ look at the equilibrium curve).Ĥ. How does the height you calculated compare with that expected from a tray column designed for the same separation (see example 4‐3 for the number of trays)? Please comment on the similarities and differences and any assumptions that you made to make this comparison.ģ. How does your solution compare with that shown in your text? What differences exist and why?Ģ. The reflux is returned as a saturated liquid and CMO can be assumed.įind the optimum feed plate location and the total number of equilibrium stages required. A distillate composition of 80 mol% ethanol and a bottoms composition of 2 mol% ethanol are desired. The feed is 20 mol% ethanol, feed rate is 1000 kmol/h, and feed temperature is 80☏. In the enriching section HG = 0.4054 m and HL = 0.253 m, and in the stripping section HG = 0.2835 m and HL = 0.1067 mĪ distillation column with a total condenser and a partial reboiler is separating an ethanol-water mixture. Use a vapor flow rate that is nominally 75% of flooding. We wish to repeat Example 4-3 (distillation of ethanol and water) except that a column packed withĢ-inch metal Pall rings will be used. Equilibrium data for acetone and ethanol at 1 atm Stages, and required q value of the feed. If the feed composition is z = 0.3 (all concentrations are moleįraction of more volatile component), find the optimum feed plate location, total number of
The distillation column in parts a and b is separating acetone from ethanol and has xD = 0.9, xB If the bottoms composition is xB = 0.13 mole fraction acetone and theīoilup ratio /B = 1.0, find the vapor composition leaving the second stage above the partialĬ. A distillation column separating acetone and ethanol has a partial reboiler that acts as anĮquilibrium contact.
If L/V is equal to 0.8, find the composition of the liquid leaving the fifth stage belowī. A distillateĬoncentration of xD = 0.90 mole fraction acetone is desired. A distillation column with a total condenser is separating acetone from ethanol. If F = 50 mol/h, z = 0.8, p = 1 atm, and ym = 0.892 mole fraction methanol, find V, L, and xm.Ī. If z = 0.4, p = 1 atm, and Tdrum = 77☌, find V/F, xm, and ym. What must the flow rate and composition of the feed be?į. We are operating the flash drum so that the liquid mole fraction is 45 mol% methanol. V/F must be used? For a feed rate of 1000 lbmol/h, find product flow rates and compositions.ĭ. If the feed is 30 mol% methanol and we desire a liquid product that is 20 mol% methanol, what Mole fractions and flow rates? Feed rate is 100 kmol/h.Ĭ. Feed is 60 mol% methanol, and 40% of the feed is vaporized. We are separating a mixture of methanol and water in a flash drum at 1 atm pressure. HowĬan you get the composition from P and T? Setting the pressure and temperature also specifies the equilibrium composition. This part is sort of backwards (feed composition is not specified). Which variables have been specified, and how doesĭ. Which two variables (besides the feedĬomposition) have been specified? The drum just separates the vapor from the liquid.Ĭ. The other comments/questions are to help you.Ī.
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