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

Answers (1)

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_2to SO_3 by the reaction with oxygen in the presence of a catalyst (V_2O_5 ), and

(iii) absorption of SO_3in H_2SO_4to 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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