Comparing the two methods of producing ethanol
2 marks · NormalState one advantage and one disadvantage of producing ethanol by hydration of ethene rather than by fermentation.
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Also accept: Advantage: produces purer ethanol / is a continuous process / is faster. Disadvantage: uses non-renewable resources / requires high energy / higher temperature and pressure.
Common mistakes: Giving an advantage/disadvantage of fermentation instead.
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Marking points
B1 · 1 mark · States one correct advantage of hydration of ethene over fermentation (e.g., produces purer ethanol, is continuous, is faster, more efficient).
B2 · 1 mark · States one correct disadvantage of hydration of ethene over fermentation (e.g., uses non-renewable crude oil, requires high temperatures/energy, higher pressure).
Worked solution
Advantage: The hydration of ethene is a continuous process and produces much purer ethanol.
Disadvantage: It uses non-renewable petroleum-based resources and requires a high input of energy.