N2 O2 nitrogen oxygen gas generator PSA VSA VPSA Membrane Liquid LN2 LO2 Cryogenic for all gas applications & demands

- Oct 13, 2017-

N2 O2 nitrogen oxygen gas generator PSA VSA VPSA Membrane Liquid LN2 LO2 Cryogenic for all gas applications & demands

Nitrogen & Oxygen generators principle Pressure swing adsorption

Pressure swing adsorption (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., zeolites, 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.



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. This is the process used in medical oxygen concentrators used by emphysema patients and others who require oxygen-enriched air to breathe. Using two adsorbent vessels allows near-continuous production of the target gas. It also permits so-called pressure equalisation, where the gas leaving the vessel being depressurised is used to partially pressurise the second vessel. This results in significant energy savings, and is common industrial practice. (the above requires major revision-the information is wrong) look at the size of O2 vs N2, O2 is smaller and is absorbed by the zeolite (the structure of zeolight only handles O2), and released on de-pressurization. nitrogen flows freely through the bed. all PSA devices are designed on this principle since 1953. look at the angstroms size, the atomic structure (and attractive forces acting) you will see which is bigger and what it's doing.




·        Air, after compression and dehumidification, is pumped into adsorption tank.

·        There are 2 processes taking place inside the adsorption tank, which are i) the process of adsorbing oxygen molecules onto the adsorbent material under pressure and abstracting nitrogen molecules, ii) the process of desorbing oxygen molecules from adsorbent material by depressurization to atmospheric pressure. In order to have continuous nitrogen output, the two processes repeat alternately in the two parallel adsorption tanks. This method is called PSA (Pressure Swing Adsorption).

·        Generated nitrogen is stalled in the gas tank, which the purity is monitored by integrated oxygen sensor.

Product Uses PSA N2

IndustryApplicationPurity (%)
Petrol chemicalPVC99.95
Benzene anhydride99
Petroleum and gasStorage, transportation, pipe cleaning97
Tire manufactureSulfuration99.99
Tire inflation95-99
Food and beverageFilling and sealing99-99.5
Beverage stirring99-99.6
Sauce/jam packing99-99.5
Edible oil99-99.5
Milk powder packaging99.9-99.99
Snack packaging99-99.5
ElectronicsDiode manufacture99.999
Transistor manufacture99.999
Process protection99.99-99.995
Heat treatmentProcess protection99.99-99.999
PharmacyAmpoule sealing99.99
Material transportation99.9
Vessel/tank inerting99
Quality protection99
Inert protection99.9-99.99
BiofuelInert protection99.5-99.9
FertilizerRaw material99.999
Coal mineFire proof99
MetallurgeContinuous casting99.99
Powder metallurge99.9
Magnetic material sintering99.995
Steel manufacture99.99
PlasticsPlastic granule transportation99
Plastic manufacture process99
ChemicalTank/vessel/duct purging99
Rubber packaging/storage99
Oil and greaseTank sealing99.5
Duct/vessel purging99.5
Oil transportion99.5
Reaction vessel inerting99.5
Float glassProcess protection99.9995
New materialProcess protection98

Buying Guides

The following points need to be confirmed by the purchaser before quoting and purchasing.

1. Country and standards (CE, PED, ASME, UL, API, GHOST, etc.).

2. Application.

3. Site conditions: altitude, temperature, humidity, surroundings, power supply specifications (voltage/Hz).

4. Basic requirements on capacity: purity, displacement (max output flow), product gas delivery pressure.

5. Any special requirements, such as for medical, short delivery time, shockproof, explosionproof, portable, movable, oil-free for product gas, no harmful gases (CO, CO2, SO2, etc.) in product gas, low dew-point, ....