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What is the major engineering problem associated with ammonia production?

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What is the major engineering problem associated with ammonia production?

(a) Corrosion

(b) Heat recovery

(c) Handling deposited carbon

(d) Burner design

The question was posed to me by my school principal while I was bunking the class.

Origin of the question is Inorganic Chemical topic in section Inorganic Chemical Industries of Chemical Technology

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Right answer is (a) Corrosion

To elaborate: This has been the major reason why NH3CO2 process was slow to develop. High cost silver or tantalum liners are used in the autoclave with hastelloy C, titanium, stainless steel and aluminium alloys used in order to reduce corrosion.

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