Pressure Swing Adsorption (PSA) technology

How it works

Pressure Swing Adsorption (PSA) is a cost-effective method of producing high-purity nitrogen and oxygen. All of Oreco’s PSA generators are based on PSA technology. An Oreco NitroGen® solution consists of two cylinders that store Carbon Molecular Sieves (CMS), which is used to produce nitrogen. An external buffer tank stores the pure nitrogen. Zeolite is used for oxygen production.


The PSA process starts as clean and dry compressed air enters the first cylinder (left).

The unwanted oxygen gas is adsorbed by the pellets at high pressure, but the nitrogen molecules pass through. The resulting high-purity nitrogen gas is stored in the buffer tank. 

During this step of the cycle, the second cylinder (right) is cleaned.


Next, the pressure between the two cylinders is equalised.


When the pressure drops in the left cylinder and the pellets are saturated, waste products (oxygen) are blown out through the exhaust system.

The process is repeated from step, 2 but this time in the right cylinder. Pressure builds up, followed by equalisation.

The process is repeated and a constant production of nitrogen gas is established.

Contact us

Oreco A/S . Oldvej 1A . DK-3540 Lynge . Denmark . TEL. +45 4332 0200 .

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