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  • Specialty Gas Mixing
  • Gas Chromatography
  • Process Instrumentation
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University Schedule

  • March 14 - 16 Basic Gravimetric Mixture Filling
  • March 16 - 18 Basic Gas Chromatography
  • June 13 - 15 Advanced Gravimetric Mixture Filling
  • June 15 - 17 Advanced Gas Chromatography
  • September 12 - 14 Basic Gravimetric Mixture Filling
  • September 14 - 16 Basic Gas Chromatography

Cryo Trap Gas Purifier

Improve your GC Performance with our helium carrier gas purifier

Our cryo traps purify the carrier gas being supplied to a Gas Chromatograph (GC) significantly improving the GC performance especially for PPM or PPB analysis. The Precision Specialty Gas is used to purify Helium or Neon. It uses an activated carbon bed immersed in a liquid nitrogen bath. It will remove the following impurities by freezing or liquefying: water, Carbon Dioxide, Oxygen, Argon and hydrocarbons. It will impede the flow of Nitrogen significantly to produce a very clean outlet stream of the source gas.

Features & Benefits

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  • Designed to purify the carrier gas, such as Helium or Neon, being supplied to a Gas Chromatograph (GC) significantly improving the GC performance especially for PPM or PPB analysis.
  • It will remove the following impurities by freezing or liquefying: water, Carbon Dioxide, Oxygen, Argon and hydrocarbons. It will impede the flow of Nitrogen significantly to produce a very clean outlet stream of the source gas.
  • The gas purifier uses low temperature deposition of impurities in Helium, Neon or Hydrogen. It traps inert gases, such as Argon, Krypton, and Xenon to the ppb level.
  • This is a simple, low cost, highly effective regeneration makes the purifier usable for years without media replacement.
  • Each unit is shipped fully assembled and comes pre-tested

Available Options

  • Activated Carbon or Molecular Sieve
  • 30 liter dewar
  • Regenerated/Exchange traps

 

Helium Gas Purifiers

The easy and economical way to purify industrial grade helium (5.0) into Chromatographic grade (6.0 or better) and compress it into cylinders in your facility.

Purify Helium or Neon with Precision’s process gas purifier. It uses an activated carbon bed immersed in a liquid nitrogen bath. Helium or Neon is pumped into the purifier at up to 5000 SCFH. (The upper limit on capacity is to ensure that the gas has sufficient residence time in the trap to capture the impurities.) A back pressure regulator on the outlet of the trap prevents free flow through the unit.

The gas flows through a pre-cooling coil within the liquid nitrogen vessel and continues through a series of activated carbon canisters that capture the impurities and impede the flow of nitrogen. After the trap, the gas is warmed with an ambient air vaporizer and then returned to the control panel. When the purifier has become saturated with impurities, it must be regenerated. Nitrogen supplied to the skid is heated with an onboard heater and the hot nitrogen flows through the activated carbon to release and drive out the impurities.

Features & Benefits

  • Removes the following impurities by freezing or liquefying: water, Carbon Dioxide, Oxygen, Argon and hydrocarbons
  • Designed to significantly impede the flow of Nitrogen to produce a very clean outlet stream of the source gas.
  • The purifier unit doesn’t need to be in a permanent location. It operates without electricity or nitrogen gas.
  • The unit may be placed in proximity to cylinder filling operations and moved for regeneration.
  • Skid mounted, turnkey solution is easy to set-up and start producing
  • Produce 5.0, 6.0, or possibly 7.0 grade helium from your current source of product
  • Unit includes regeneration system, allowing for repeated use of purifier traps
  • Each unit is shipped fully assembled and comes pre-tested
Major System Components
  • Control Panel – Used to direct the flow of gas to be purified and for nitrogen for regeneration.
  • Activated Carbon Trap – Captures impurities at cryogenic temperatures.
  • Cryogenic Vessel – Used to immerse the trap in liquid nitrogen.
  • Vaporizer – Warms the purified gas back to ambient temperatures.
  • Heater – Heats the nitrogen used to regenerate the trap.
  • Electrical Enclosure/Controller – Controls the heater used during regeneration.
  • Filter – Traps particulates after the purifier.

Gas Supply Considerations

The purification process depends on the residence time of the gas within the carbon traps. The slower the process, the more impurities can be removed. If the incoming gas is grossly contaminated, then a long residence time will be required.

While gas compressors are sometimes used to feed the purifier, with a compressor feeding the system, it is often not possible to reduce the flow rate through the purifier. A storage tube or bank of cylinders is highly recommended.

In addition to controlling the residence time of the gas, flow control is important to control the boil off of liquid nitrogen in the cryogenic vessel. If the incoming gas is cold, say from a tube trailer in the winter, the boil off will be less pronounced than if the same trailer were used in the summer.

Excessive boil off of liquid nitrogen is bad for two reasons: it may be so violent that it poses a risk of injuring the operator and/or it may mean that the carbon traps are not being maintained at the desired cryogenic temperatures and the effectiveness of the purifier is diminished.

The liquid nitrogen should not boil off violently, but more like a gentle simmer as in a boiling pot of water.

The purifier must be periodically regenerated to remove the impurities trapped within it. NOTE: While the purifier will remove trace oxygen from an incoming gas stream, gross contaminants of oxygen should not be passed through the purifier as it is packed with activated carbon.

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