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Pressure Swing Absorbtion diag

Pressure Swing Adsorption

Pressure Swing Adsorption Explained

The characteristic of molecular sieve crystals to differentially adsorb the gases comprising air make oxygen concentration possible in devices of small-scale and modest power consumption. The efficiency of the process is promoted under conditions of higher pressure, lower temperature, and higher concentrations of the gases to be adsorbed.

As air flows through a column (or bed) of molecular sieve, the component gases it contains are adsorbed and stratified in the order of their relative affinity to the molecular sieve material.

The process may continue until the next to last gas component stratifies near the end of the bed. Once the full bed length is used, the bed must be regenerated by desorbing (or purging) the adsorbed gases. Purging is accomplished by reducing the pressure in the bed and back-flushing with some of the concentrated gas product. Adsorption and desorption are completely reversible processes and can be carried out indefinitely. If properly cycled through the adsorb-desorb process, molecular sieve beds never "wear out" or become "clogged."

Last Updated: December 31, 2014

OG-15

The OG-15 Oxygen Concentrator uses pressure swing absorption to remove nitrogen from the compressed air. The OG-15 uses 2 sieve beds and cycles between sieve beds during operation. The internal compressor creates air pressures of 30-40 PSI, and oxyge pressures of up to 15 PSI.

OX-15

The OX-15 Oxygen Concentrator uses pressure swing absorption to remove nitrogen from the compressed air. The OX-15 uses multiple sieve beds and is constantly purging one of the many sieve beds to maintain constant outlet oxygen pressures. The internal compressor creates air pressures of 30 PSI, and oxyge pressures of up to 7 PSI.

AS-D

The AS-D is a large industrial oxygen concentrator that requires 90 PSI of compressor air, but can provide oxygen pressures over 50 PSI. Two large sieve beds are used to purge nitrogen from the air.
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