Fertiliser Technology
Fertiliser plant making ammonium sulphate employing gypsum-ammonia reaction (usual practice is to use ammonia and sulphuric acid) is located at

Baroda (under G.S.F.C.)
Rourkela (under SAIL)
Sindri (under FCI)
Bokaro (under SAIL)

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Fertiliser Technology
Multistage operation (as in the case of catalytic oxidation of SO₂) is not carried out for NH₃ synthesis, because of

Higher pumping cost
Comparatively higher pressure drop
Chances of entrainment and disturbance of catalyst bed
High cost of the high pressure vessel used for the reactor

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