Question

7. Why is there a need for rectification of air?
A. so that specific gases can be different purposes
C. so that the air is cooled
B. so that gases become liquids
D. so that air is heated
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Answer 1

Answer:

C. so that the air is cooled

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Answer 2

Rectification of air is performed to cool the air.

• An air-rectification system includes a two-stage low-temperature separation column connected to a heat exchanger
• Whereby air is cooled as it passes through the heat exchanger and is introduced into the high-pressure stage of the column, oxygen and nitrogen are fed from the high-pressure stage to a low-pressure stage of the column
• And separated therein to form low-temperature product oxygen and nitrogen that are warmed separately by passage through the heat exchanger, and a gas stream representing a heat-balancing stream is extracted from the rectification column.
• And passed through the heat exchanger, one of the gas streams between the heat exchanger and the rectification column being compressed at low temperatures.