
Why Air Separation Pre-Purification Removes Both Water and Carbon Dioxide
Air separation units remove water and carbon dioxide from air before it is cooled, because both would freeze solid inside the cold box. This article explains why.
Technical Notes
Notes on molecular sieve selection, loading and product care.

Air separation units remove water and carbon dioxide from air before it is cooled, because both would freeze solid inside the cold box. This article explains why.

Most adsorbent problems blamed on product quality start during loading and storage. This article covers the storage, loading and sealing habits that protect performance.

Molecular sieves are named by pore size. This guide explains what 3A, 4A, 5A and 13X can and cannot adsorb, where each grade is used, and how to choose the right one.
Recommended products
The molecular sieve series covered in these notes — send us your process conditions for selection support.

High-performance adsorbents for oxygen concentrators and industrial PSA oxygen-generation systems. In PSA oxygen generation, the adsorbent selectively adsorbs nitrogen from air so oxygen-enriched gas can be produced on site.

13X molecular sieve is a sodium-form X-type zeolite adsorbent designed for the removal of water, carbon dioxide and molecules with an effective diameter below approximately 10 angstroms. It is widely used in industrial gas drying and pre-purification duties.

3A molecular sieve is a potassium-form A-type zeolite adsorbent with an effective pore opening of approximately 3 angstroms. It adsorbs water and other small polar molecules while excluding most hydrocarbons, which makes it a standard choice for deep drying of gases and liquids.