A distillation column is connected to another separation device. The fresh feed to the column is F= 1000.0 kmol/h of a saturated vapor that is 20.0…

A distillation column is connected to another separation device. The fresh feed to the column is F= 1000.0 kmol/h of a saturated vapor that is 20.0 mol% ethanol and 80.0mol% water. The feed is input at its optimum feed stage. The distillation column has a partial condenser and no reboiler. The column is heated with direct injection of pure steam with is a saturated vapor at 1.0 atm. The ratio bottoms flow rate = B/S= 5.0. The reflux ration L0/D= 1.0. The distillate from the column is 70mol% ethanol and the bottoms is 1.0mol% ethanol. The column operates at a pressure of 1atm, the reflux is returned as a saturated liquid, and CMO is assumed to be valid.

The distillate is sent to a separation device that, because it operates on a different principle than distillation, is not limited by the precense of an azeotrope. The device produces product P and recycle stream R that is a saturated liquid returned to the distillation column at its optimum feed stage. The product P concentration from the device is 98.7 mol% ethanol.

a. Find steam flow rate S, bottoms flow rate B, distillate flow rate D, prduct flow rate P, and recycle rate R -all in kmol/h- and find mole fraction of ethanol in recycle stream Xr.

b. For the distillation column find the optimum feed plate for the recycle stream, the optimum feed plate for fresh feed, and the total number of equilibrium stages required.

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