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Which of the following reaction unit is used in manufacture of Ammonium Nitrate by Stengel’s process?(a) Carbon steel(b) Graphite(c) Stainless steel(d) TantalumThe question was posed to me in a national level competition.This intriguing question originated from Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

Answer» CORRECT choice is (d) Tantalum

The explanation: Carbon steel can be used only in the reaction where TEMPERATURE reaches a maximum of 120 degrees. However, in Stengel process, where it is necessary to preheat 60% HNO3 to 170 degrees, expensive tantalum metal is needed to avoid high temperature HNO3 CORROSION.


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