Adsorption Technology. PSA Generators

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Exceptional comprehension of adsorption technology enables Grasys to develop high performance PSA generators.

Adsorption technology enables to efficiently produce such gases as nitrogen and oxygen from atmosphere air. The unit operation is based on the pressure swing adsorption principle (PSA). Adsorption separation process for gaseous fluid is based on the condition of solid substance, called adsorbent, binding of single gas mixture components. Such a phenomenon is driven by coupling strength of gas and adsorbent molecules.

Currently, three procedures for cyclic heatless adsorption air separation process have gained widespread: pressure - Pressure Swing Adsorption (PSA), vacuum - Vacuum Swing Adsorption (VSA) and mixed - Vacuum Pressure Swing Adsorption (VPSA). For pressure patterns - Pressure Swing Adsorption (PSA) - nitrogen (oxygen) is recovered at a pressure value above atmosphere whereas adsorbent regeneration stage proceeds at atmosphere pressure. In vacuum patterns - Vacuum Swing Adsorption (VSA) - nitrogen (oxygen) is produced at atmosphere pressure, whereas regeneration is performed at negative pressure. Functioning of the mixed patterns - Vacuum Pressure Swing Adsorption (VPSA) - combines a change in pressure from positive to negative.

The PSA unit operating principle is based on the different absorption rates of the gas mixture single components passed through adsorbent under pressure. Successive absorption stages of the separated gas mixture components and adsorbent regeneration are performed by changing pressure in two adsorbers, which are vessels containing adsorbent. These stages proceed at temperature close to indoor temperature. At the absorption stage performed under elevated pressure one of the gas mixture components is predominantly captured by adsorbent with resulting product gas. At the regeneration stage the absorbed component is discharged from adsorbent and vented into the atmosphere. Thereupon the whole process reiterates.

Adsorption Generator Flowchart Used for Oxygen / Nitrogen Production

Air-to-gaseous nitrogen or oxygen production technology using adsorption processes is highly researched and enjoys wide application in industrial-scale plants to produce high-purity nitrogen or oxygen.

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