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Why is Monoethanol amine used in the manufacture of CO2 gas?

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Why is Monoethanol amine used in the manufacture of CO2 gas?

(a) Coolant

(b) Absorber

(c) To increase the pH

(d) To decrease the pH

The question was posed to me during a job interview.

This intriguing question comes from Synthetic Organic Chemical Industries in chapter Synthetic Organic Chemical Industries of Chemical Technology

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The correct option is (b) Absorber

For explanation: Monoethanol amine is used as a absorber for manufacture of CO2 gas because it’s a weak base which can be used as a scrubber.

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