Dowex 50W-X4 CAS NO.11113-61-4

Introduction 3A MOLECULAR SIEVE is an alkali metal alumino-silicate; it is the potassium form of the type A crystal structure. 3A molecular sieve ha…

Introduction 3A MOLECULAR SIEVE is an alkali metal alumino-silicate; it is the potassium form of the type A crystal structure. 3A molecular sieve has an effective pore opening of about 3 angstroms (0.3nm). This is large enough to allow in moisture, but excludes molecules such as unsaturated hydrocarbons which can potentially form polymers; and this maximises lifetime when dehydrating such molecules. Typical Chemical Formula 0.45 K2O . 0.55 Na2O . Al2O3 . 2 SiO2 . 4.5H2O Technical Parameter Item Unit Technical data Shape Pellet Sphere Diameter mm 1.5-1.7 3.0-3.3 1.7-2.5 3.0-5.0 Size ratio up to grade % ≥98 ≥98 ≥96 ≥96 Bulk density g/ml ≥0.64 ≥0.64 ≥0.68 ≥0.68 Wear ratio % ≤0.20 ≤0.25 ≤0.10 ≤0.10 Crushing strength N ≥45/cm ≥60/cm ≥30/piece ≥70/piece Static water adsorption % ≥20 ≥20 ≥20 ≥20 Ethylene adsorption % ≤3.0 ≤3.0 ≤3.0 ≤3.0 Water content, as shipped % ≤1.5 ≤1.5 ≤1.5 ≤1.5 Typical Application Drying of unsaturated hydrocarbons (e.g. ethylene, propylene, butadien) Cracked Gas Drying Drying of natural gas, if COS minimization is essential, or a minimum co-adsorption of hydrocarbons is required. Drying of highly polar compounds, such as methanol and ethanol Drying of liquid alcohol Static, (non-regenerative) dehydration of insulating glass units, whether air filled or gas-filled. Drying of refrigerants Regeneration 3A Molecular sieve can be regenerated by either heating in the case of thermal swing processes; or by lowering the pressure in the case of pressure swing processes. To remove moisture from a 3A molecular sieve, a temperature of 200-230°C is required. A properly regenerated molecular sieve can give moisture dew points below -100°C. The outlet concentrations on a pressure swing process will depend on the gas present, and on the conditions of the process. Size 3A molecular sieve are available in beads of 1-2 mm, (10x18 mesh) 2-3 mm, (8x12 mesh) , 2.5-5 mm, (4x8 mesh) and as powder, and in pellet 1.6”, 3.2”.