Molecular sieve adsorbents are crystalline aluminosilicates, known as zeolites. Their unique structure allows the water of crystallization to be removed, leaving a porous crystalline structure. These pores, or cages, have a high affinity to re-adsorb water or other polar molecules. Aided by strong ionic forces (electrostatic fields) due to the presence of cations such as sodium, calcium and potassium, and by the enormous internal surface area of up to 1,000 m2/g, molecular sieves will adsorb a considerable amount of water or other fluids. If the fluid to be adsorbed is a polar compound, it can be adsorbed with high loading, even at very low concentrations of the fluid. Molecular sieves will, therefore, remove gas or liquid impurities to very low levels (ppm or less).
Another feature of molecular sieve adsorbents is their ability to separate gases or liquids by molecular size or polarity. The pore, or cage, openings are the same size as many molecules, e.g., in the case of hydrocarbon paraffins, straight-chained molecules can fit into the pores and be adsorbed, while the branched-chain molecules cannot enter the pores and pass through the molecular sieve bed unadsorbed.
Research and Development
Since its founding, Zeochem has been at the leading edge of synthetic molecular sieve technology. We have developed an ultra-stable molecular sieve able to withstand thousands of thermal regenerations with delayed decay and exceptional capacity retention. Our efforts have been rewarded in recent years with numerous patents on zeolite manufacture and applications. These examples of unilateral product and process development are mirrored by our focus on real-world applications and participation in joint development projects with customers. Well-equipped laboratories and pilot facilities support our researchers, who also have close relationships with numerous universities and private laboratories, with their specialized facilities and expertise.
Zeochem’s proprietary manufacturing processes use the latest processing equipment and computerized process control systems. Special efforts have been made to monitor and control all phases of production. Vendors are required to not only meet our stringent raw material specifications, but also to have in place extensive quality systems geared toward the continuous improvement of their products and processes. We demand that of ourselves and require it of our suppliers. We continue to upgrade and expand our processes and manufacturing capabilities, including toll manufacturing, regeneration of spent product and custom manufacturing. This continuous improvement allows us to meet the challenges of the 21st century.