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How is sulphuricacid manufacture by contact process ? |
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Answer» Solution :Manufacture of sulphuric acid by contact process involves the following steps. i. Initially sulphur dioxide is produced by burning sulphur or iron pyrites in oxygen/air. `S+O_(2)rarrSO_(2)` `4FeS_(2)+11O_(2)rarr2Fe_(2)O_(3)+8SO_(2)` ii. Sulphur dioxide formed is oxidised to sulphur trioxide by air in the presence of a catalyst such as `V_(2)O_(5)` or platinised asbestos. iii. The sulphur trioxide is absorbed in concentration sulphuric acid and PRODUCES OLEUM `(H_(2)S_(2)O_(7))`. The oleum is converted into sulphuric acid by diluting it with water. `SO_(3)+H_(2)SO_(4)rarr H_(2)S_(2)O_(2)overset(H_(2)O)rarr 2H_(2)SO_(4)` To maximise the YIELD the plant is operated at 2 bar pressure and 720 K. The sulphuric acid obtained is this process is over `96%` pure. |
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