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Which of the following reaction unit is used in manufacture of Ammonium Nitrate by Stengel’s process?

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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) Tantalum

The 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

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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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