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A stream of aqueous methanol having 45 mol% CHOH is to be separated into a top product having 96 mol% methanol and a bottom product with 4% methanol. The feed is at its bubble point and the operating pressure is 101.3 kPa. A reflux ratio of 1.5 is suggested. (i) Determine the number of ideal trays, (ii) Find the number of real tray if the overall tray efficiency is 40%. On which real tray should the feed be introduced ? The equilibrium data for the methanol-water system at 101.3 kPa are given below. X 8 0 y 0 0.02 0.134 0.04 0.23 0.06 0.304 0.08 0.365 0.10 0.418 0.15 0.517 0.20 0.579 X y 0.30 0.665 0.40 0.729 0.50 0.779 0.60 0.825 0.70 0.87 0.80 0.915 X 0.90 0.958 0.95 0.979 1.0 y 1.0
A stream of aqueous methanol having 45 mol% CHOH is to be separated into a top product having 96 mol% methanol and a bottom product with 4% methanol. The feed is at its bubble point and the operating pressure is ...

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4. A mixture of water and ethyl alcohol containing 0.16 mole fraction alcohol is continuously distilled in a plate fractionating column to give a product containing 0.77 mole fraction alcohol and a waste of 0.02 mole fraction alcohol. It is proposed to withdraw 25 per cent of the alcohol in the entering stream as a side stream containing 0.50 mole fraction of alcohol. Determine the number of theoretical plates required and the plate from which the side stream should be withdrawn if the feed is liquor at its boiling point and a reflux ratio of2 is used.
4. A mixture of water and ethyl alcohol containing 0.16 mole fraction alcohol is continuously distilled in a plate fractionating column to give a product containing 0.77 mole fraction alcohol and a waste of 0.02 mole fraction alcohol. It is ...

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