oxygen is prepared on a large scale from
Answers
Answer:
Oxygen is prepared commercially on a large scale by fractional distillation of liquified air.
Explanation:
Oxygen is a gas used widely for many purposes- starting for use in the industry for cutting steel to as a life saver in hospitals!
Commercially, oxygen is obtained by fractional distillation.
What is the process of fractional distillation of air?
In this method, the air is passed through a supercooled chamber and cooled down to -200°C. As the temperature goes down-
- Water vapour condenses and is removed using absorbent filters from the air mixture.
- Next, Carbon dioxide solidifies at -79°C, and it is removed.
- As the temperature decreases further, the air liquefies and the air mixture contains a mixture of liquid nitrogen and liquid oxygen.
- The liquid nitrogen and oxygen are then separated by fractional distillation.
The liquid air mixture is passed through the bottom of a separating column. The temperature at the bottom of this column is comparatively higher than in the upper region.
Oxygen is less volatile than Nitrogen. Nitrogen has a boiling point of -190°C, whereas, oxygen has a boiling point of -185°C.
Thus, by this method, nitrogen and oxygen are separated out. Oxygen is collected at the bottom and nitrogen is collected from the top.
Conclusion:
Thus, oxygen is obtained commercially by fractional distillation of liquified air.
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