Your local gas generation partner


Pressure Swing Adsorption, on-site nitrogen gas generation

One of the core technologies in many nitrogen gas generators today is Pressure Swing Adsorption (PSA), using Carbon Molecular Sieve (CMS) adsorbent. The PSA process using CMS is a highly efficient method of generating high purity nitrogen gas from compressed air.

What are PSA and CMS?

PSA is an air separation technique that allows the separation of a gas mixture into its individual components by using a solid medium, in this case CMS, to which part of the gas mixture preferentially adsorbs under pressure.

The CMS is essentially a bed of small carbon beads. When a nitrogen purification column packed with CMS is pressurised with atmospheric air (mainly consisting of nitrogen, oxygen and argon) and moisture, oxygen and moisture are adsorbed by the carbon beads whereas nitrogen is not. This occurs because of the angstrom size of nitrogen and oxygen molecules – the CMS pores are exactly the right size to allow oxygen to enter and adsorb, whereas the nitrogen molecules are too large and pass through the purification column.

PSA-nitrogen generator

PSA using CMS diagram

The PSA process consists of a two stage cycle;

  1. The Adsorption stage, where oxygen, H2O, and CO2 molecules in compressed air are adsorbed into the porous structure of the CMS whilst nitrogen molecules pass through the column and into a storage vessel.
  2. The Regeneration stage where the pressure normalises via rapid depressurisation and the adsorbed molecules are vented to the atmosphere.

This process requires a constant temperature, which is as close to an ambient as conditions will allow (20-25 deg C).

Peak Scientific produce several PSA generators including several of our best-selling Genius series to our Precision Nitrogen and Hydrogen generators for GC as well as our whole of lab solution, i-FlowLab.

To find out more about Peak's PSA generators    






Related Post: Read about the advantages of PSA nitrogen generators here.

Laboratory nitrogen hydrogen

Peak Scientific laboratory gas generators

Post a comment

Please enter the code as shown:


Mr. Misao Iwata - 04/10/2016 03:47
Dear Sirs,

Would you, please, give me a technological comment of whether or not your company
are able to fabricate the PSA units to adsorb and desorb CO2 from flue gas stream?

I am very thrilled at your comment.

I look forward to receiving your comments as quickly as possible.

Thank you very much, indeed.

With the best regards.
Bruce Peat - 04/10/2016 07:55
Dear Mr Misao Iwata,

To ensure the best quality and purity of nitrogen output we always recommend that the inlet gas meets ISO8753-1:2010 Class 1.4.1. We would not recommend the use of flue gas which does not meet this standard to supply our compressorless nitrogen generators.

A breakdown of this standard is below:

Class 1 Particulate
In each cubic metre of compressed air, the particulate count should not exceed 20,000 particles in the 0.1-0.5 micron size range, 400 particles in the 0.5-1 micron range and 10 particles in the 1-5 micron size range.

Class 4 Water
A pressure dew point (PDP) of +3 degrees C or better is required and no liquid water is allowed.

Class 1 Oil
In each cubic metre of compressed air, not more than 0.01mg of oil is allowed. This is a total level for liquid oil, oil aerosol and oil vapour.

If you have any further questions please let us know by leaving a comment or you can use the following link to contact us:

Kind Regards,



Peak Scientific ASMS conference Peak Scientific scoops Scottish Exporter of the Year Award Scottish Engineering Awards Nitrogen Trace Product Catalogue HPLC Geneva International Track Fastest Growing Private Business Gas Chromatography Nitrogen Carrier Gas Hydrogen cylinders Dr Ed Connor Awards JASIS Japan Precision video GC Austria (MSACL) conference Birmingham Helium gas agilent generator celebrate gas agilent tardis peak Dusty Beijing Nitrogen Hydrogen ebf gas generation #dustyontour lab gas nitrogen hydrogen China #dustyontour Melbourne laboratory Peak logo Matterhorn LC-MS gas generator analysis laboratory gas generator modified atmosphere packaging laser cutting electronic component assembly India Exhibition lab National Convention South African Chemical Institute SACI lab gas bottling sparging flushing storing wine Christmas 12 days Rudolph christmas xmas new periodic elements song music universe generation Scotland pancake science Australia Proteomics show valentines love Price increase bulk gas Agilent Safety Mass Spectrometry Sciex sciex tour Award Gas Generator Innovation Queen's Award on-site adsorption PSA safety on-site nitrogen generation CMS Analytica Germany gas generators exhibitions Munich Genius 3010 Ant Teknik Eurasia Istanbul Turkey Hydrogen trace nitrogen trace careers football GC-MS food quality Genius Shimadzu 3051 Kemiportalen pairing search find Sweat diffusion through snow GC analysis Gas chromatography capillary column cylinder AZOM MRX labs gas chromatography wine cork no-taint Amorim NDtech jobs cancer dogs Infinity showcase product Nihonium Moscovium Tennessine Oganesson The International Union of Pure and Applied Chemistry Tomatoes La Tomatina Chromatography today gas cylinder BioTechniques User Manuals Stoller Biomarker Discovery Centre MS table Mass Spec Thermal Desorption Sampling Corona CAD Detector Singapore training Solaris china precision nm32la service Protected proteomics peak protected NMR spectroscopy Tianjin Ionization Mass Spectrometry Conference AIMS 2016 high-purity gas After-sales maintenance seminar Genius series LCMs Genius Nitrogen Generator Precision Hydrogen Generator maintenance ELSD Micro Mass Spec zero air i-FlowLab whole of lab register flexflow elsd solaris mass spec high-performance liquid chromatography N2 Solaris Nitrogen Northern Flicker bird Tartarian Morrow's Honeysuckle APS Proteomics Lorne exhibition FlexFlow helium Valentine's Day mass spectrometry hydrogen generator nitrogen generator chromatography customer service expertise warranty hplc Europe food gc lcms gc-ms China-lab GCMS zeroair iflow Peak SCientific TOC LC-MS Chromatography Gas generators asms launch reviews NM32LA genius selectscience asia oil & gas n2 oxygen ICP-MS collision Qatar Select Science Complete Protected generators event university singapore USA Cylinders switch design technology Scientific show after service support engineer OEM chromatographie Values brand promise protected CPL-SM Thermo Scientific Aerosol detector Cannabis Quality Control Testing LCMS SM-PCI hydrogène gaz de collision Garantie générateur de gaz Gasgenerator Nitroge iflow lab Careers Recruitment Sample Evaporation ICP CO2 Analyzer FT-IR TOC hygrogen carrier gas i-flowlab azote LC_MS
To Top