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3A Molecular Sieve Specifications:
  • Chemical Name: Potassium
     Aluminosilicate
  • Synonyms: Synthetic Zeolite
  • Color: Tan
  • Nominal Pore Size: 3 angstroms
  • Bead Size: 4x8 mesh (~1/8" dia.)
  • Crush Strength: 14 lbs
  • Bulk Density: 47 lbs/cu ft
  • H2O Absorption Capacity: 21% wt.
  • H20 Content (shipped): 1.5% wt.
  • Heat of Adsorption (max.):
    1800 BTU/lb H20
  • Specific Heat (approx.):
     0.23 BTU/lb/ deg F

4A Molecular Sieve Specifications:
  • Chemical Name: Sodium
     Aluminosilicate
  • Synonyms: Synthetic Zeolite
  • Color: Tan
  • Nominal Pore Size:4 angstroms
  • Bead Size: 4x8 mesh (~1/8" dia.)
  • Crush Strength: 18 lbs
  • Bulk Density: 46 lbs/cu ft
  • H2O Absorption Capacity: 24% wt.
  • H20 Content (shipped): 1.5% wt.
  • Heat of Adsorption (max.):
    1800 BTU/lb H20
  • Specific Heat (approx.):
    0.23 BTU/lb/ deg F

MSDS Available On Request.



Cat#
Size  1 lb
 2 lbs
 6 lbs
PR-MS3A
3A
$11.00
$17.50
$43.00
PR-MS4A
4A
$11.00
$17.50
$43.00

How Molecular Sieves Work:
Molecular sieves, because of their crystalline composition and carefully controlled pore sizes, will yield virtually water-free products. While both the solvent and the water will adsorb strongly to the molecular sieve surfaces, the large surface area within the pores is only accessible to the smaller water molecules, so they are effectively removed from the solvent. From the table below it can be seen that water (1.93A) will enter that 3A pore size while acetone (3.08A) will largely be excluded. Water will be able to occupy the large surface area inside the pores and thus be removed. If the solvent could also enter the pores, it would compete with water for the surface area and there would be little or no removal of the water from the bulk solvent. Type 4A molecular sieve is not suitable for drying ethanol, methanol, or acetone since the pore size does not exclude these solvents.

Molecular Radius, nm
 Water
0.193
 Acetone
0.308

How to Use the Sieves:
Running the solvent slowly through a column of the molecular sieves would be the most effective way to remove water. Typically though, dried sieves are just placed into the bulk solvent container (about 5%-10% by volume) to remove the water.

How to Reactivate:
Molecular sieves can be regenerated by evacuating or purging, usually at elevated temperatures. The purge gas temperature must be sufficiently high to bring the molecular sieves to a level of 350 to 450F. If adequately regenerated, it is possible to dry fluids to less than 0.1 ppm H20.

Also See: Drying Agents for Common Solvents

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