D11. We wish to distill an ethanol-water mixture to produce 2250lb of distillate product per day. The distillate product is 80mol% ethanol and 20mol% water. An L/D of 2.0 is to be used. The column operates at 1atm. A packed column will use 5/8-inch plastic Pall rings. Calculate the diameter at the top of the column. Physical properties: MWE=46,MWW=18, assume ideal gas, L=0.52cP at 176F,L=0.82 g/ml a. Operation is at 75% of flooding. What diameter is required? b. * If Eq. (10-45) is not satisfied, what size of plastic Pall rings should be used? c.* Operation is at a pressure drop of 0.25 in. of water per foot of packing. Use the size of Pall rings found in part b. What column diameter is required? d. Repeat part a (with 1.0-in. Pall rings) but for 22,500 lb of distillate product per day. If Eq. (10-45) is not satisfied, find the diameter of plastic Pall rings that work. Note: It is not necessary to redo the entire calculation, since D and hence V and hence diameter are related to the feed rate