Question
Asked Jan 29, 2019
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A novice manufacture of alcohol for gasohol is having a bit difficulty with a distillation column. The operation is shown in figure. Too much alcohol is lost in the bottoms (waste). Calculate the composition of the bottoms and the weight of alcohol lost in the bottoms.

System
Boundary
Cooling
Water
Vapor
Heat
Exchanger
Reflux
Distillate (Product) P?
60% EtOH
40% H2O
Wt 1/10 feed
1000 kg Feed
Distillation
Column
F 10% EtOH
90% H2O
Bottoms (Waste) B-?
EtOH?
H20?
Heat
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System Boundary Cooling Water Vapor Heat Exchanger Reflux Distillate (Product) P? 60% EtOH 40% H2O Wt 1/10 feed 1000 kg Feed Distillation Column F 10% EtOH 90% H2O Bottoms (Waste) B-? EtOH? H20? Heat

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Expert Answer

Step 1

It is given that the weight of the product (distillate) is 1/10 of the feed. Thus,

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Step 2

Now, apply material balance on overall process, that is, the system boundary.

Total mass balance is given by equation (1) and mass balance on Ethanol (alcohol) is given by equation (2). Let the mass fraction of ethanol in the bottoms be xB(EtOH).

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Step 3

Solve equations (1) and...

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