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Amine absorption of CO2 is followed by which operation?

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Amine absorption of CO2 is followed by which operation?

(a) Cuprous formate

(b) Water scrubbing

(c) Liquid N2 scrubbing

(d) Caustic scrubbing

This question was posed to me during an online interview.

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

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Right answer is (d) Caustic scrubbing

To elaborate: Caustic scrubbing is done in order to have amine absorption of CO2. Cuprous scrubbing and liquid N2 scrubbing is done in order to remove traces of CO and CO2.

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