Write two condition to maximise the yield of h2so4 by contact process
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Answer: (i) Low temperature (ii) High pressure (iii) V2O5 as catalyst.
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Manufacture of sulphuric acid by Contact process involves three steps:-
1. Burning of ores to form SO2
2. Conversion of SO2 to SO3 by the reaction of the former with O2
3. Absorption of SO3 in H2SO4 to give oleum (H2S2O7).
➤The key step in this process is the second step.
➤In this step, two moles of gaseous reactants combine to give one mole of gaseous product. Also, this reaction is exothermic.
➤Thus, in accordance with Le Chatelier’s principle, to obtain the maximum amount of SO3 gas, temperature should be low and pressure should be high.
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