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DX Model PSA Nitrogen Gas Plants

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DX Model PSA Nitrogen Gas Plants
In case higher purities are required like 99.999 % and additional deoxo purification systems is required. There are two types :
Palladium based purification system:
In this after PSA plant a deaxo tower is added in which hydrogen reacts with oxygen and thus removes oxygen from Nitrogen. Moisture formed is removed in downstream gas dryer. Following is the composition of gas.
Nitrogen: 99.999%
Oxygen: in ppm level
Hydrozen: 0.5% min. or more if required
Dew point: -( 60 ) deg. or better
Copper based deoxo purification system:
However, in case, both hydrozen and oxygen are not required. A copper deoxo based system is used to eliminate both hydrogen and oxygen.
Nitrogen: 99.999%
Oxygen: ppm level
Hydrogen: Nill to ppm level
Hydrogen source ( ammonia cracker unit )
Note: In both the above cases, hydrogen can be sourced from ammonia cracker unit which can be supplied as part of plant.
Ultra high purity model:
In this type, purity of 99.9999% is directly available from PSA module without deoxo by use of different technology/material & longer time cycle.
Advantages are:

  • Higher purity without deoxo system.
  • Most useful where hydrogen/ammonia is not easily available.
  • Most economical upto 100 Nm 3/hr.


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