Pioneer Air Systems

Molecular Sieve



Molecular sieves are synthetically produced, highly porous desiccants. These desiccants generally include aluminate silicates, porous glass, charcoals and zeolites.

The desiccants can adsorb moisture up to 22% of its weight. Regeneration is generally accomplished with pressure swing, called PSA in Oxygen/Nitrogen generation; and, with temperature swing at temperatures over 130 0C.
These desiccants have pores of precise diameter, measured in Angstroms – 3A, 4A, 5A, 8A and 10A or 13X.
Molecules smaller than pore sizes are withheld or adsorbed by the desiccant; whereas, larger molecules are free flow out. The process is used to separate unwanted molecules.
Molecular sieves can adsorb water vapor molecules from air and gases down to 1 PPM level.
Commonly used Molecular sieves:
Grade 3A: For drying liquids e.g. Ethanol, Ethylene, Propylene, Refrigerant, Air and Gases; also adsorbs NH3
Grade 4A: For drying Compressed Air & Gases to very low dew points, down to -120 0F; also adsorbs CO2, SO2, H2S and Heavy hydrocarbons
Grade 5A: For drying of Cracked gas, Ethylene, Propylene; also for a used for high purity oxygen generation in medical applications
Grade 10X (8A): For adsorption of hydrocarbons and aromatics and drying gases.
Grade 13X (10A): For air purification due to its high water and carbon dioxide adsorption capacity; also adsorbs Sulfur compounds to sweeten gas.

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