PSA Nitrogen Generator

GENERON® has over 40 years of experience in the design and manufacturing of Nitrogen Pressure Swing Adsorption (PSA) systems.  With many standard models to choose from, GENERON® has a model that is right for you. If one of our 50+ standard models does not meet your needs, we can custom build one to your exact specifications.

GENERON® has over 20,000 systems installed worldwide, in most every market, including; Manufacturing, Marine, Petrochemical, and Oil & Gas. GENERON® manufactures the following Series of  PSA nitrogen generation systems, per environment and user requirements:

PSA nitrogen generator

Twin Tower Series – Used for General Industrial Applications

Over 50 Standard Models to Choose from, Low Flow & High Flow designs

Compact Series – Used for Industrial Applications

where all vessels are contained on one base for easy transport and installation

Smaller Systems for low to medium flows; Incoming Air Receiver, Nitrogen vessels, and Nitrogen Buffer vessel all on common base.

Bank Series – Used for Industrial Applications

where system expansion might be desired.

Smaller Systems for low to medium flows; banks of vessels are utilized and added as system requirements change.

Marine Series – Used in Marine Industry

onboard ships and tankers

Designed for limited space and height requirements

Maritime classifications, such as DNV-GL, ABS, ClassNK, LR, RINA, etc.

Custom Designed Series

GENERON® will design and build systems to your project specification.

If one of our Standard Designs doesn’t meet your needs, we specialize in designing and building systems to individual or project specifications, around the world.


What Is an Pressure Swing Adsorption (PSA)?

PSA is a technology used to separate some gas species from a mixture of gases under pressure according to the species’ molecular characteristics and affinity for an adsorbent material. It operates at near-ambient temperatures and differs significantly from cryogenic distillation techniques of gas separation. Specific adsorptive materials (e.g., activated carbon, molecular sieves, etc.) are used as a trap, preferentially adsorbing the target gas species at high pressure. The process then swings to low pressure to desorb the adsorbed material.

How Does an Industrial PSA Nitrogen Generator Work?

Pressure swing adsorption processes rely on the fact that under high pressure, gases tend to be attracted to solid surfaces, or “adsorbed”. The higher the pressure, the more gas is adsorbed; when the pressure is reduced, the gas is released, or desorbed. PSA processes can be used to separate gases in a mixture because different gases tend to be attracted to different solid surfaces more or less strongly. If a gas mixture such as air, for example, is passed under pressure through a vessel containing an adsorbent bed of zeolite that attracts nitrogen more strongly than it does oxygen, part or all of the nitrogen will stay in the bed, and the gas coming out of the vessel will be enriched in oxygen. When the bed reaches the end of its capacity to adsorb nitrogen, it can be regenerated by reducing the pressure, thereby releasing the adsorbed nitrogen. It is then ready for another cycle of producing oxygen-enriched air.

Using two adsorbent vessels allows near-continuous production of the target gas. It also permits so-called pressure equalization, where the gas leaving the vessel being depressurized is used to partially pressurize the second vessel. This results in significant energy savings, and is common industrial practice.
GENERON offers a Industrial Series including:

Why choose a GENERON® PSA Nitrogen Generator?


  • The key to making the investment in Nitrogen Generation equipment is to be certain you are purchasing from a dependable company. GENERON® has thousands of systems installed and operating worldwide.
  • GENERON® has one of the largest product portfolios on the market with over 50 standard models to choose from, and purities up to 99.9995% and flow rates to 2,030 scfm (3,200 Nm3/h)
  • Quality is assured and maintained through ISO-9001 certified design and manufacturing facilities.


  • Cost saving of 50% to 300% when compared to bulk liquid supply, dewar, and Nitrogen cylinders
  • Continuous supply, will never run out of Nitrogen
  • No complicated supply contracts with ever escalating charges 


  • No safety or handling issues associated with bulky high pressure cylinders
  • Eliminates the dangers of cryogenic liquids


Typical System Configuration (PFD)

PSA nitrogen generation system

System Specification

  • GENERON® can offer complete turn-key system design, including all system components and design drawings. Our technical teams work directly with our clients to specify and install systems to our customer’s exact specifications.  GENERON® has a full service team ready 24 / 7 to answer any question you may have.


How a Pressure Swing adsorption (PSA) system works:

GENERON® Nitrogen PSA Generator Systems use the basic principle of passing air over a bed of engineered adsorbent material, which bonds with oxygen, leaving a rich stream of nitrogen gas to exit.

The adsorption separation is accomplished by the following process steps:


The inlet (ambient) air is compressed by an air compressor, dried by an air dryer, and filtered, before entering the process vessels.


The pre-treated and filtered air is directed into a vessel filled with Carbon Molecular Sieve (CMS) where the oxygen is adsorbed preferentially in the CMS pores.  This allows concentrated nitrogen, with an adjustable purity, (as low as 50 ppm O2) to remain in the gas stream and flow out of the vessel.  Before the full adsorption capacity of the CMS is reached, the separation process interrupts the inlet flow, and switches to the other adsorber vessel.


The oxygen-saturated CMS is regenerated (the adsorbed gases are released) by means of a pressure reduction, below that of the previous adsorption step.  This is achieved by a simple pressure release system where the exhaust (waste) gas stream is vented from the vessel, usually through a diffuser or silencer and back into safe surrounding atmosphere. The regenerated CMS is refreshed and can now be used again for the generation of nitrogen.


Adsorption and desorption should take place alternately at equal time intervals. This means that the continuous generation of nitrogen can be achieved by using two adsorbers;  while one is adsorbing, the other is in regeneration mode; and switching back and forth, provides for a continuous and controlled flow of nitrogen.


Constant nitrogen product flow and purity is ensured by a connected product buffer vessel that stores the nitrogen output.  This can be designed for nitrogen purities up to 99.9995%  and pressures up to 150 psig (10 bar).


The result product is a constant stream of On Site produced, high purity Nitrogen, at a cost significantly below the price of liquid or bottled gases.

PSA nitrogen compressor