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Changing of internals of a column, with more efficient ones are?

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Changing of internals of a column, with more efficient ones are?

(a) Retrofitting

(b) Refitting

(c) Revamping

(d) Recycling

I got this question at a job interview.

My question is based upon Definition of Tray Area, Vapour Load and Liquid Load topic in section Tray Design and Operation of Distillation Design

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Right answer is (a) Retrofitting

Easiest explanation: Retrofitting is generally done to reduce energy consumption of the column, it also increases the operating cost as well.

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