The cooled reaction gases are then passed through the bottom of an absorption column where a stream of air is added to oxidise nitric oxide to nitrogen dioxide.
2.
As the nitrogen dioxide passes up the column, it is absorbed by a stream of water flowing from the top of the absorption column to yield the desired product ( 57 % nitric acid ) which is then stored for downstream use.
3.
This stream of gas containing SO 2, after necessary cooling is passed through the catalytic converter bed column again achieving up to 99.8 % conversion of SO 2 to SO 3 and the gases are again passed through the final absorption column thus resulting not only achieving high conversion efficiency for SO 2 but also enabling production of higher concentration of sulfuric acid.
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