Ammonia (Habor Process) (D) Flashcards
1
Q
How do we obtain nitrogen?
A
Through fractional distillation of liquid air.
2
Q
How do we obtain hydrogen?
A
Through cracking of crude oil.
3
Q
What are the optimal conditions for Haber Process?
A
- Temperature: 450°C
- Pressure: 250 atm
- Presence of a finely-divided iron catalyst
4
Q
What is the equation for the formation of nitrogen?
A
N2 (g) + 3H2 (g) ⇌ 2NH3 (g)
5
Q
State two reasons why unreacted gases are fed back into the reactor.
A
- Unreacted gases are recycled and reused to produce the maximum yield of ammonia
- To save cost and energy from burning fossils fuels from obtaining nitrogen from fractional distillation of liquid air and hydrogen from hydrocarbons
6
Q
Pros and cons of using higher temperature.
A
- Pro: Faster speed of reaction
- Con: Lower yield of ammonia
7
Q
Pros and cons of using a lower temperature.
A
- Pro: Higher yield of ammonia
- Con: Slower speed of reaction
8
Q
Pros and cons of using a high pressure.
A
- Pros: Higher yield of ammonia, Faster speed of reaction
- Cons: Higher cost of maintaining equipment
9
Q
Pros and cons of using a lower pressure.
A
- Pro: None
- Con: Lower yield of ammonia, slower speed of reaction
10
Q
Why are expensive metals as catalysts more economical
A
- Catalysts speeds up rate of reaction so processes can be completer in a shorter time using less fuel
- Catalysts are chemically unchanged so it can be reused indefinitely
