14 Nitrogen & Fertilizers

Potassium

________ promotes growth and healthy fruit and flowers.

Ammonia

________ is manufactured using The Haber process which occurs in five stages:

Fertilisers

________ contain nitrogen, potassium and phosphorus.

atm

So 200 ________ is a compromise pressure between a lower yield of products being made safely and economically.

ºC

So 450 ________ is a compromise temperature between having a lower yield of products but being made more quickly.

N2

Stage 1: H2 and ________ are obtained from natural gas and the air respectively and are pumped into the compressor through pipe.

Nitrogen

________ makes chlorophyll and protein and promotes healthy leaves.

Phosphorus

________ promotes healthy roots.

iron catalyst

The ________ does not increase the yield of ammonia produced but it does increase the rate of reaction, meaning that more ammonia can be made in a given time.

Ammonia

________ can be displaced from its salts by the addition of an alkali substance.

Fertiliser

________ compounds contain the following water- soluble ions:

ammonia

The ________ is liquefied and removed to pressurised storage vessels.

Stage 1

 H2 and N2 are obtained from natural gas and the air respectively and are pumped into the compressor through pipe

Stage 2

 The gases are compressed to about 200 atmospheres inside the compressor

Stage 3

The pressurised gases are pumped into a tank containing layers of catalytic iron beds at a temperature of 450 °C

Stage 4

 Unreacted H2 and N2 and the product ammonia pass into a cooling tank

Stage 5

The unreacted H2 and N2 gases are recycled back into the system and start over again

Temperature

450 ºC

Pressure

200 atm

Catalyst

 Iron