Ethanol Flashcards Preview

GCSE Chemisty*** > Ethanol > Flashcards

Flashcards in Ethanol Deck (10):
1

Chemical formula for ethanol

C2H5OH

2

Conditions for hydration of ethene

- 60-70 atmospheres
- 250-350°C
- phosphoric acid as a catalyst

3

Describe the process of hydration of ethene

- it is a continuous process
- Ethene and steam is fed in at one end and moves over phosphoric acid and ethanol comes out the other

4

Positives of hydration of ethene

- Unreacted ethene is recycled
- constant process
- pure ethanol comes out
- quick process

5

Negatives of hydration of ethene

- uses a lot of energy
- ethene is non-renewable as it comes from crude oil

6

Conditions needed for fermentation

- reactants = yeast and sugar
- 30-40°C
- anaerobic, in a closed vessel- enzymes present

7

Describe fermentation

- large sugar molecules (sucrose) are broken down into glucose and fructose
- Enzymes in the yeast break the glucose into ethanol and CO2

8

Positives of fermentation

- sugar is a renewable resource
- uses little energy

9

Negative’s of fermentation

- not pure ethanol is produced, it needs to be purified by fractional distillation
- batch process
- takes 20-60 hours to ferment

10

Describe the hydration of ethanol to form ethene

- ethanol is passed over a hit aluminium oxide catalyst