Question

Nitric acid prepared from ostwald process

Answer 1

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Answer 2

Nitric oxide gas obtained by the oxidation of ammonia is very hot. In order to reduce its temperature, it is passed through a heat exchanger where the temperature of nitric oxide is reduces to 150oC. Nitric oxide after cooling is transferred to another oxidizing tower where at about 50oC it is oxidized to nitrogen dioxide (NO2).

2NO + O2 ↔2 NO2

Step 3 — Absorption of NO2 (formation of HNO3)

Nitrogen dioxide from secondary oxidation chamber is introduced into a special absorption tower. NO2 gas passed through the tower and water is showered over it. By the absorption, nitric acid is obtained.

3NO2 + H2O -> 2HNO3 + NO

Nitric acid so obtain is very dilute. It is recycled in absorption tower so that more and more NO2 get absorbed. HNO3 after recycle becomes about 68 per cent concentrated.

Step 4 — Concentration

In order to increase the concentration of HNO3, vapours of HNO3 are passed over concentrated H2SO4. Being a dehydrating agent, H2SO4 absorbs water from HNO3 and concentrated HNO3 is obtained.

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