Question: A distillation column with two feeds is separating ethanol from water. The first feed is 60 wt.% ethanol, has a total flow rate of

A distillation column with two feeds is separating ethanol from water. The

A distillation column with two feeds is separating ethanol from water. The first feed is 60 wt.% ethanol, has a total flow rate of 1000 kg/h, and is a mix of liquid and vapor at 81 C. The second feed is 10 wt% ethanol, has a total flow rate of 500 kg/h and is liquid at 20 C. We desire a bottoms product that is 0.01 wt% ethanol and a distillate product that is 85 wt% ethanol. The column operates at 1 kg/cm and is adiabatic. The column has a total condenser and a partial reboiler, which acts as an equilibrium contact. The distillate and reflux are saturated liquids. Find B and D in kg/h and find Qc and QR in kcal/h for: (a) reflux ratio Lo/D = 3. (b) boilup ratio/= 2.5 (These are two separate problems). Use the H vs. x,y diagram for enthalpy values.

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