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  Dewars Method

Dewar’s Method:

The mixture of noble gases acquired by the above technique is separated into individual constituents by the utilization of coconut charcoal that adsorbs various gases at distinct temperatures.

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                                               Figure: Separation of noble gases (Dewar’s technique)

The mixture of noble gases are passed into a double-walled bulb having coconut charcoal and located in a low temperature bath at 173K. It is permitted to stay in contact with the charcoal for about half an hour. At 173K, only argon, krypton and xenon are absorbed by the charcoal whereas helium and neon stay unabsorbed. These are pumped out and collected.

The mixture of neon and helium is kept in contact with coconut charcoal at 93K that completely absorbs neon leaving free helium.

The charcoal at 173K having argon, krypton and xenon is positioned in contact with the other charcoal at the temperature of liquid air whenever argon diffuses into other charcoal.

The temperature of first charcoal (i.e., temp.173K) still having krypton and xenon is raised to 183K whenever krypton is set free while xenon stay absorbed in the charcoal. Whenever it is heated, xenon is recovered.

 

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