Discussion
Match each stage of the contact process with what happens in it.
List I
A. Sulphur burner
B. Converter
C. Absorption tower
D. Drying tower
List II
1. trioxide is absorbed into strong acid
2. sulphur is burned in dry air to the dioxide
3. air is dried with sulphuric acid before use
4. the dioxide is oxidised over vanadium catalyst
Answer: B
The four vessels appear in every flowsheet of the process, and the drying tower is the one most often forgotten although moisture in the air would cause mist in the absorber later. Each vessel appears on every flowsheet of the process.
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