In this process SO2 is obtained by brning sulpher or Iron pyrites in air
S + O → SO2
4FeS2 + 11O2 → 2Fe2O3 + 8SO2
The obtained SO2 is oxidised SO2 + NO2 → SO3 + NO into SO3 by NO3 The obtained SO3 is treated is less then chamber crystals are formed.
2SO2 + NO + NO2 + H2O + O2 → 2(OHSO2.O.NO)
When champer crystals are appeared the flow of water vapours increases.
As a result of this H2SO4 is obtained
2(OHSO2.O.NO) + H2O → 2H2SO4 + NO + NO2
