Molecular sieves are crystalline metal aluminosilicates having a three dimensional interconnecting network of silica and alumina tetrahedral. This sodium form represents the type A family of molecular sieves. Effective pore opening is ~4A thus excluding molecules of effective diameter > 4A. e.g. propane.
Type 4A molecular sieve is typically used in regenerable drying systems to remove water vapor or contaminants which have a smaller critical diameter than four angstroms. Generally considered a universal drying agent in nonpolar media. Due to is unique crystal structure the water of crystallization is removed from the network by heating to produce uniform cavities called pores which selectively absorb molecules of a specific size. This strong absorptive force allows molecular sieves to remove many gas or liquid impurities to ppm or less level. Our molecular sieve exhibits high resistance to attrition and physical damage during service.
Typical technical Data Sheet
| Parameters | 4A-S | 4A-G |
|---|---|---|
| Shape Pellets | Beads Pellets | Beads |
| Size (mm) | 3.0 & 1.5 0.5 – 6.0* | 3.0 & 1.5 0.5 – 6.0* |
| Bulk Density (kg/lit) | 0.75 – 0.85 | 0.64 – 0.70 |
| Water Absorption Capacity @ 15% RH & 30° C (%) | 21.5 | 18.0 |
| Water Absorption Capacity @ 75% RH & 30° C (%) | 23.5 | 21.0 |
| Attrition loss / Abrasion loss (%) | < 0.15 | < 0.2 |
| Specific Heat (kcal/ kg/ °C) | 0.23 | |
| Heat of Absorption (Kcal/kg H2O) | 1050 | |
| Packing in steel drum (kg) | 150 -160 | 125 -145 |
* A set of size can be selected from the above range. E.g 0.5- 2mm, 1-3mm, 2-4 mm, 3-5 mm etc.
Major Applications: Preferred for static / dynamic dehydration in closed liquid or gas systems, e.g LPG & LNG drying, solvent drying, air drying, in packing of drugs, electric components and perishable chemicals. Water scavenging in printing & plastic systems and drying saturates hydrocarbon streams. Absorbed species include SO2, CO2, H2S, C2H4, C2H6 and C3H6.