In nitrogen generators, the choice of molecular sieve is critical for efficient nitrogen production, with 13X molecular sieve being the most commonly used. Its unique pore structure, measuring around 10 angstroms, allows it to selectively adsorb oxygen, carbon dioxide, and water vapor from air, leaving nitrogen to pass through—a process central to pressure swing adsorption (PSA) technology.
5A molecular sieve is another option, particularly in systems where a slightly smaller pore size (5 angstroms) enhances the separation of nitrogen from other gases with similar molecular sizes. This molecular sieve excels in applications requiring high-purity nitrogen, as it minimizes the adsorption of nitrogen molecules while targeting impurities.
The packing of these molecular sieves in the generator’s adsorption towers is designed to maximize surface contact with the air stream. During the PSA cycle, compressed air flows through the packing, and the molecular sieve adsorbs unwanted gases under pressure. When the pressure is released, the adsorbed molecules are desorbed, regenerating the sieve for repeated use.
Both 13X and 5A molecular sieves offer high adsorption capacity and stability, ensuring consistent nitrogen output. Their ability to withstand frequent regeneration cycles makes them ideal for continuous nitrogen generation, meeting the demands of industries like food packaging, electronics, and chemical processing.
