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# Describe the manufacture of H2SO4 by contact process?

7.21     Describe the manufacture of $H_{2}SO_{4}$ by contact process?

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Sulphuric acid is manufactured by the Contact Process that involves three steps:

(i) burning of sulphide ores or sulphur in the air to generate.$SO_2$

(ii) conversion of $SO_2$to $SO_3$ by the reaction with oxygen in the presence of a catalyst ($V_2O_5$ ), and

(iii) absorption of $SO_3$in $H_2SO_4$to give Oleum ($H_2S_2O_7$)

Diluting the oleum with water gives $H_2SO_4$ of the desired concentration.

$2SO_2+O_2\rightarrow 2SO_3$

$SO_3+H_2SO_4\rightarrow H_2S_2O_7(olium)$

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