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Question:

Describe the manufacture of H2SO4 by contact process?

Answer:

Sulphuric acid is manufactured by the contact process. It involves the following steps:

Step(i):

Sulphur or sulphide ores are burnt in air to form SO2.

 

Step(ii):

By a reaction with oxygen, SO2 is converted into SO3 in the presence of V2O5 as a catalyst.

 

Step (iii):

SO3 produced is absorbed on H2SO4 to give H2S2O7 (oleum). This oleum is then diluted to obtain H2SO4 of the desired concentration. In practice, the plant is operated at 2 bar (pressure) and 720 K (temperature). The sulphuric acid thus obtained is 96-98% pure.


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