3.3.6: Ethanol Production

Question 1

Two ways to produce ethanol

Answer 1

Hydrating alkenes

Fermenting sugars

Question 2

Hydrating alkenes

Answer 2

steam and an acid catalyst

Question 3

Hydration of ethene conditions and catalyst

Answer 3

300 degrees C
60atm
solid phosphoric acid catalyst

Question 4

Hydration of ethene produces

Answer 4

ethanol

industrially

Question 5

How to increase yield of ethene hydration producing ethanol

Answer 5

re-use unreacted ethene gas

Question 6

Fermentation of glucose

Answer 6

An exothermic process carried out by yeast in anaerobic conditions
yeast produces enzymes which convert glucose into ethanol co2

Question 7

Where does ethene come from which is used in the industrial production of ethanol

Answer 7

cracking heavy fractions of crude oil

Question 8

How can the concentration of ethanol be increased after fermentation?

Answer 8

Fraction distillation

Question 9

Biofuel

Answer 9

A fuel made from biological material that has recently died

Question 10

Biofuel

and example

Answer 10

A fuel made from biological material that has recently died

eg: bioethanol

Question 11

Advantages of biofuels

2

Answer 11

Renewable energy sources

Release CO2 when burnt but effectively carbon neutral

Question 12

Ethical problem with biofuels

Answer 12

food vs fuel debate

land used for growing crops for fuel can’t be used to grow food

Question 13

Disadvantages with use of biofuels

Answer 13

ethical problem
deforestation
use of fertilisers which can be negative
practical problems

Question 14

Why isn’t the use of biofuels carbon neutral?

Answer 14

fossil fuels will be burned to power machinary, in transport and refinement = release CO2