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Question
How is ethanol manufactured from sugarcane?
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Solution
The fermentation method can be used to obtain ethanol from sugarcane. Actually, in industries, C2H5OH is prepared by the fermentation of molasses, which is a by-product obtained during the manufacture of sugar from sugarcane.
It is converted into ethanol by the following steps:
- Dilution of molasses
- Addition of nitrogen source
- Addition of yeast
- Distillation of wash.
Chemical Reductions:
\[\ce{\underset{\text{Sugar}}{C12H22O11} + H2O->[Invertase]\underset{\text{Glucose}}{C6H12O6} + \underset{\text{Fructose}}{C6H12O6}}\]
\[\ce{\underset{\text{Glucose or Fructose}}{C6H12O6}->[Zymase]\underset{\text{Ethanol}}{2C2H5OH} + 2CO2}\]
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