MOLECULAR SIEVE 4A
Molecular sieves are crystalline metal aluminsilicates having a threedimensional interconnecting network of silica and alumina tetrahendra. This sodium form reoresents the type A family of molecular sieves. Effective pore opening is -4A0, 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 its unique crystal structure the water of crystallization is removed from the network by heating to produce uniform cavities called pores which selectivley adsorb molecules of a specific size. This strong adsorptive force allows molecular sieves to remove many gas or liquid impurities to ppm or less levels. Our molecular Sieve exhibits high resistance to attrition and physical damage during service.
Typical Technical Data
Parameter 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 Adsorption Capacity @ 15% RH & 300C (%) 21.5 18.0
Water Adsorption Capacity @ 75%RH & 300C (%) 23.5 21.0
Attrition loss / Abrasion loss (%) <0.15 <0.2
Specific Heat (kcal/kg H2O) 0.23
Heat of Adsorption (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 mm, 1-3 mm, 2-4 mm, 3-5mm etc.
Major Applications: Perferred for static / dyanamnic dehydration in closed liquid or gas systems, e.g., LPG & LNG drying, solvent drying, air drying, in packaging of drugs, eletric components and perishable chemicals; water scavenging in printing and plastic systems and drying saturated hydrocarbon streams. Adsorbed speacies include SO2, CO2,H2S, C2H4, C2H6, and C3H6.
