Molecular sieve adsorbents are crystalline alumino-silicates, known as zeolites which having a three dimensional interconnecting network of silica and alumina tetrahedra. Their unique structure allows the natural 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 of a specific size which is aided by strong ionic forces due to the presence of cations such as sodium, calcium and potassium and by the absolutely enormous internal surface area, molecular sieves will adsorb a considerable amount of water or other fluids. Highly electropositive cations, like sodium, potassium and calcium present in their structure, increase the polarity of these sieves. Further they have a very high surface area, a much required criteria for high adsorption. These molecular sieves are being used to separate even traces of polar impurities in gases or liquids. The size of the pores, match the selective polar molecules adsorbed. The other molecules of different sizes pass through the bed without being trapped.
The synthetic zeolites normally have two structures namely the Type – A and the Type – X for commercial application. Between the two types of Structures, a wide variety of zeolites with selective adsorption pores can be prepared. Usually the molecular sieves are offered in three different forms, namely the Beads, Pellets and Powder. Beads offer a larger surface Area compared to Pellets.
SINOCATA offers molecular sieve adsorbent products targeted at the natural gas, refining, petrochemical, air drying markets and other industrial application. SINOCATA 3A, 4A, 5A, 13X molecular sieves are commonly used for applications such as drying gases and liquids; cleaning technical gases, petrochemical and natural gases, hydrogen and oxygen production. Also SINOCATA offer specialty molecular sieves for your unique applications. About the form and sizes, A 4×8 mesh size of zeolite molecular sieve is normally used in gas phase applications, while the 8 x12 mesh size is common in liquid phase applications. The powder forms of the 3A, 4A, 5A and 13X sieves are suitable for specialized applications. 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 many gas or liquid impurities to very low levels (ppm or less).
Why Use Zeolite Molecular Sieves?
- Zeolite based adsorbents offering high adsorption capacity of water at low partial pressures.
- Separation of compounds of similar polarity.
- Selective adsorption or separation based on molecular size.
- Drying of polar compounds.
Where To Use Zeolite Molecular Sieves!
- Natural Gas
- Industrial Gas
- Medical Oxygen
- Coatings, Sealants & Adhesives
- Drying Applications