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In which process unconverted NH3 is absorbed?

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In which process unconverted NH3 is absorbed?

(a) Stamicarbon process

(b) Toyo koatsu process

(c) Inventa process

(d) Hot- recycle process

I got this question during an internship interview.

Question is taken from Inorganic Chemical in portion Inorganic Chemical Industries of Chemical Technology

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The correct choice is (c) Inventa process

Easiest explanation: In inventa process, unconverted NH3 is absorbed in aqueous urea nitrate solution, then stripped and returned to autoclave. It provides better temperature control. Recycle gases are absorbed in stamicarbon process.

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