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1.The air is first filtered to remove dust, then water vapour and carbon dioxide are removed (If water vapour and carbon dioxide are not removed, they would become solid in the cooling process and block the pipes).
2.Air is compressed to a high pressure and then cooled. This cooled air is then allowed to expand quickly into a chamber through a jet. This expansion cools the air even more.
3.The process of compression, cooling and rapid expansion of air is repeated again and again making the air more and more cool. Ultimately the air gets so cooled that it turns into a liquid. In this way,liquid air is obtained.
4.The liquid air is fed into a tall fractional distillation column from near its bottom and warmed up slowly.
(a) Liquid nitrogen (present in liquid air) has the lowest boiling point of, -196°.So, on warming,liquid nitrogen boils off first to form nitrogen gas. This nitrogen gas is collected from the top part of the fractional distillation column.
(b) Liquid argon (present in liquid air) has a slightly higher boiling point of, -186° So, liquid argon boils off next and collected as argon gas in the middle part of the fractional distillation column.
(c) Liquid oxygen (present in liquid air) has a still higher boiling point of, -183°.So, liquid oxygen boils off last and collected as oxygen gas from the bottom of the fractional distillation column.
A flow diagram showing the main processes involved in obtaining different gases from air is given below :
Notes
Matter in Our Surroundings - Notes
1. The Case of a Liquid Solute Dissolved in a Liquid Solvent
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2. 11. Metals Usually Have a Silver or Grey Colour
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5. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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9. To Study the Properties of a Colloid
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12. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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14. Separation Of Mixture Of a Solid And a Liquids
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16. 1. Separation by a Suitable Solvent
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18. 6. Metals are Usually Strong. They Have High Tensile Strength.
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20. To Separate a Mixture of Alcohol and Water
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21. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
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22. To Study the Properties of a Compound of Iron and Sulphur
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25. To Study the Properties of a Solution
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28. Separation of Mixture Of Two Solids
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29. 3. Metals are Good Conductors of Heat and Electricity.
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30. 11. Non-Metals Have Many Different Colours.
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32. Chemical Formula for daily use material
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34. To Separate the Salt-Water Mixture (or Salt-Solution)
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44. 7. Metals are Solids at the Room Temperature
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46. 4. Metals are Lustrous (or Shiny), and can be Polished.
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