90 kg/h of a mixture of water and ethanol is fed to a distillation column. The mixture fed consists of 40% ethanol by weight and the balance is water.

The overhead vapor was found to contain 85 wt% ethanol, and the liquid leaving the column from the bottom has 98 wt% water. The vapor stream enters a condenser and is then split into

two streams. The reflux stream is recycled back to the column and the distillate stream is collected.

The liquid from the bottom enters eboiler that has two outlets: the vapor stream is recycled to the column and the liquid stream is collected as "bottoms"

It is known that 80% of the mixture fed goes to the overhead stream. 5% of the amount of ethanol fed is collected in the "bottoms! stream.

a. Draw and label the process flow sheet. (5 marks)

b. Calculate the NDF for each control volume (you can skip the splitter/condenser). You need to explain on the scanned copy how you found each NDF and you need to enter the values for the

NDFs here in the system. (15 marks)

c. Calculate the mass flow rate of the "bottoms" stream, the mass flow rate of the "distillate" and the mass flow rate of the "reflux". You need to enter your final answers here in the