Question

why is preparation of sulphuric acid called contact process?

Answer 1

Answer on Question #44176, Chemistry, Other

Question:

why is preparation of sulphuric acid called contact process?

Answer:

The stage of oxidation of $\mathrm{SO}_2$ is carried out at $400 - 500^{\circ}\mathrm{C}$ in contact tower where $\mathrm{V}_2\mathrm{O}_5$ is filled in different pipes. $\mathrm{SO}_2$ here contacts with the catalyst and reacts with air $(\mathrm{O}_2)$ to produce $\mathrm{SO}_3$. Under above conditions $98\%$ $\mathrm{SO}_2$ is converted into $\mathrm{SO}_3$.

$$2 \mathrm{SO}_2 + \mathrm{O}_2 \rightarrow 2 \mathrm{SO}_3 + 45 \mathrm{kcal}$$

Vanadium pentaoxide $(\mathrm{V}_2\mathrm{O}_5)$ catalyst is used to increase rate of reaction.

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