Quiz 4 Question - Distillation tower PDF

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Distillation tower ...

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CHME 326—Mass Transfer and Separation Processes Fourth Quiz, May 10, 2020

Spring 2020 Allocated time: 70 minutes Uploading time: 10 minutes

Remember that you are allowed only to use the course textbook and class notes. You are not allowed to use any other resources, neither online nor non-online. You are not allowed to have any type of communication with anyone. Not obeying these rules will have serious consequences for you. You MUST explain each and every step you are taking in solving the question. You MUST explain your reasoning at each step. Read the question carefully, understand it, make a sketch and transfer the information given to it. Analyze the system, plan your solution, and then start solving it.

A distillation column is used to separate acetone from water. The main feed to the tower is coming from an upstream process having a flow rate of 200 kmol/h and contains 70 mole percent acetone. In addition, the plant feeds a 30 mole percent acetone aqueous solution from a waste tank with a flow rate of 100 kmol/h. It was found that for each 5 moles of the main feed coming from the upstream process into the tower, 1 mole of liquid inside the tower evaporates on the feed tray. Also, it was found that the second feed, coming from the waste tank, requires 1200 kJ/kmol of heat to completely evaporate and it would completely condense if 1300 kJ/kmol of heat was removed from it. Moreover, the bottom product acetone mole percent is found to be 1 mole percent, and the reboiler vaporizes 66.67% of its feed and produces a vapor with a flow rate of 280 kmol/h. The equilibrium data for acetone in the acetone-water mixture are plotted in the graph provided. a) Calculate the percent recovery of acetone and purity in the overhead product. b) Calculate the reflux ratio required for this separation and find the number of theoretical trays.

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