Nitrogen Generators

How Onsite Nitrogen Generation Works

IATT AiroGen® Lab Nitrogen Generators use Pressure Swing Adsorption technology (PSA) to produce pure nitrogen gas from atmospheric air supplied by an external or internal air compressor. PSA produces nitrogen purity of better than 99.5% up to 99.9999%.

PSA Nitrogen Generation is carried out using the adsorptive properties of adsorptive media such as a Carbon Molecular Sieve (CMS). Oxygen and other trace gasses are preferentially adsorbed onto the adsorptive media at varying portions depending on the system pressure while the nitrogen passes through due to its molecular structure being too large to penetrate the fine porosity of the adsorptive media.

The system uses two pressurised twin towers to contain the adsorptive media where the clean dry compressed air enters at the bottom of one of the towers – oxygen, carbon dioxide, moisture, some hydrocarbons and trace gases are adsorbed and nitrogen passes through the adsorbent media bed into a buffer tank prior to the outlet, further filtration and onwards for use in the analytic application. After a predetermined time, dependant on the purity of nitrogen required, the tower switches to regenerative mode and flows the pressurised compressed air into the second tower (hence the term Pressure Swing...) where the process starts again. The first tower then depressurises and the adsorbed oxygen and other trace gases are released and exhausted to atmosphere.

What is Adsorption? – In a gas application such as nitrogen generation this is the accumulation of molecules of oxygen and other trace gases to form a thin film on the surface of a specifically selected solid such as carbon by intermolecular forces – the adsorption process is reversible which facilitates the constant use of the system to generate nitrogen on a commercially viable scale.

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Saltmeadows Trade Park, Neilson Road, Gateshead, Tyne & Wear, NE10 0EQ t. 0191 477 0060 | e. | 2016