4A Molecular Sieve Desiccant

Sold by the pound (lb) and available in two spherical sizes, 4A Molecular Sieve Desiccant is used in repackable CNG filters and low pressure filtration elements, like the SPX Hanksion HDF4 Desiccant Dryer. It can also be used in the packaging of pharmaceuticals, perishable chemicals and electronics; removing CO2 from gas and air streams; purification of various gas streams and liquids; water scavenger in paint and plastic systems; commercial drying of saturated hydrocarbons.

Available in two sizes and sold by the pound (lb), 4A Molecular Sieve Desiccant is used in compressed natural gas (CNG) drying filters as it is less reactive than other desiccants. It can also be used with low pressure repackable drying filter systems

4A Molecular Sieve Desiccant is an alkali metal alumino-silicate in the spherical form. It is the sodium form of the Type A crystal structure with an effective pore opening of 4Å. Any molecule larger than 4Å will not be able to be adsorbed.

4 Angstroms are the sodium forms of the Type A crystal structure. The sequence rate of adsorption is argon, krypton, xenon, ammonia, carbon monoxide, C2H4, C2H2, CH3OH, C2H5OH, CH3CN2, CS2, CH3CL, CH3Br, and carbon dioxide. Aromatics and branched chain hydrocarbons will not be adsorbed.

Applications

4A Molecular Sieve Desiccant has become one of the most reliable desiccants for a variety of applications including:

  • Refrigerant Drying
  • Moisture removal in PU Plastic or Paint
  • Natural Gas Drying
  • Drying Cracked Gas
  • Static drying of insulating glass units, whether air filled or gas-filled
  • Dehydration of highly polar compounds, such as methanol and ethanol
  • Dehydration of unsaturated hydrocarbons (e.g. ethylene, propylene, butadiene)

Regeneration

To regenerate the sieve you need to remove the adsorbed moisture and other materials. To regenerate 4A Molecular Sieve heat to a temperature of 250°F to 450°F.

Storage

Keep 4A Molecular Sieve in an airtight container until ready for use to avoid unintended moisture adsorption.

Specifications

PROPERTY SKU NV4A8X12 SKU NV4A4X8 UNIT
Bead Size 8 x 12 4x 8 Mesh
Nominal Pore Opening 4 4 Angstroms
Equilibrium Water Capacity at 25°C ≥22 ≥22 % Weight
Heat of Adsorption 1800 1800 BTU/lb of H2O
Bulk Density ≥.70
≥44

≥.70
≥44

g/ml
lb/ft3

Crush Strength ≥7
≥30
≥18
≥80
lb
N Size
Qualification ≥97 ≥97 %
Package Moisture ≤1.5 ≤1.5 % Weight