High purity industrial gases such as O2, N2, H2 and CO are manufactured through defined, highly specialized production processes. These processes include essential separation stages, where high quality Zeochem molecular sieves play an indispensible role, worldwide.
Cryogenic Air Separation Units (ASU)
In order to separate air cryogenically into oxygen and nitrogen the air must be treated in a front end purification process to separate out H2O, CO2, N2O and smaller hydrocarbon molecules. Over the past 30 years Zeochem has developed a number of 13X and LSX molecular sieve products which allow tremendous performance advantages to be achieved:
Products such as Zeochem Z10-02, Z10-02ND, Z10-08EP or Z10-10ND have proven in a large number of reference plants worldwide the outstanding performance in the pre- purification process. Some of these products combine the ability to not only adsorb carbon dioxide and water but also nitrogen oxides and smaller hydrocarbons, molecules which increasingly must be removed from the air due to increased environmental requirements.
Pressure Swing Adsorption Oxygen Units (PSA) and Vacuum Pressure Swing Adsorption Oxygen Units (VPSA)
Another way of separating air into oxygen and nitrogen is pressure swing adsorption, either with pressure, PSA, or using a vacuum, VPSA. Here we recommend using Zeochem's sophisticated 13X- and LiLSX based molecular sieves.
For these non-cryogenic O2 plants, Zeochem also offers a variety of adsorbents with high N2 capacity and high N2/O2 selectivity. The latest generation products such as Z10-04, for PSA units, and Z10-05-03, an advanced LiLSX adsorbent for VSA plants, provide customers with improved plant economics.
Hydrogen PSA Units
For the purification of hydrogen Zeochem recommends the use of a high quality 5A product which is designed specifically to remove CO molecules via a PSA process. This product, Zeochem Z5-01, is successfully in use in numerous hydrogen plants worldwide.
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