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3A Molecular Sieve
3A Molecular Sieve 3A Molecular Sieve 3A Molecular Sieve 3A Molecular Sieve

3A Molecular Sieve

Item No.: 3A Molecular Sieve
Molecular Sieve type 3A is an alkali metal alumino-silicate; it is the potassium form of the type A crystal structure. Type 3A has an effective pore opening of about 3 angstroms (0.3nm). This is large enough to allow in moisture, but excludes molecules su
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Description
Molecular Sieve type 3A is an alkali metal alumino-silicate; it is the potassium form of the type A crystal structure. Type 3A 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 maximizes lifetime when dehydrating such molecules.
 
Typical Chemical Formula
0.4K2O 0.6Na2O Al2O3  2.OSiO2  4.5H2O
SiO2 : Al2O3 ≈2 
 
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 ≥98 ≥98
Bulk density g/ml ≥0.65 ≥0.65 ≥0.70 ≥0.70
Wear ratio % ≤0.20 ≤0.25 ≤0.10 ≤0.10
Crushing strength N ≥45/cm ≥60/cm ≥30/p ≥70/p
Static wateadsorption % ≥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 minimization coadsorption 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
Molecular sieve Type 3A 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 - Zeolites 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”.

Attention
To avoid damp and pre-adsorption of organic before running, or must to be reactivated. 
 

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