Section 3 Flashcards
How is ethene produced?
Cracking of crude oil.
How is ethanol formed?
Ethene reacts with steam.
What is the temperature and pressure of ethene and steam reaction?
300C 60-70atm.
Why is the ethene steam reaction cheap?
Ethene is cheap and not much of it is wasted.
What is the problem with ethene and steam reaction?
It uses crude oil which is a non-renewable resource, which is running out and will soon become very expensive.
What is the catalyst for ethene and steam reaction?
Phosphoric acid.
What is the raw fermentation material?
Sugar.
What is fermentation?
Conversion of ethanol using yeast.
What temperature does fermentation need?
30C.
What is an advantage for fermentation?
Sources are renewable as sugar is grown all over the world. Yeast is also easy to grow.
What are the disadvantages of fermentation?
The process isn’t very concentrates so it needs to be distilled to increase its strength.
What is the quality of fermentation compared to ethene method?
Ethene is pure and fermentation is impure.
How can ethanol turn back into ethene?
Dehydration reaction.
How does the dehydration reaction work?
Ethanol vapour is passed over a hot catalyst of aluminium oxide.
What catalyst is used in dehydration reaction?
Aluminium oxide the catalyst provides a large surface area for the reaction.
