Question

Quote the sequence in which the constituents of air are collected in fractional distillation of air?
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Answer 1

Answer:

Fractional distillation of air

About 78 per cent of the air is nitrogen and 21 per cent is oxygen. These two gases can be separated by fractional distillation of liquid air.

Liquefying the air

Air is filtered to remove dust, and then cooled in stages until it reaches –200°C. At this temperature it is a liquid. The air has been liquefied.

Here's what happens as the air liquefies:

water vapour condenses, and is removed using absorbent filters

carbon dioxide freezes at -79°C, and is removed

oxygen liquefies at -183°C

nitrogen liquefies at -196°C

The liquid nitrogen and oxygen are then separated by fractional distillation.

The liquefied air is passed into the bottom of a fractionating column. Just as in the columns used to separate oil fractions, the column is warmer at the bottom than it is at the top.

Answer 2

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