General Information  

   Click Here for More Information about Desciccant

How Does It Work?
Molecular Sieves are synthetically produced Zeolites characterized by pores of uniform dimensions.  Their unique structure allows the water of crystallization to be removed, leaving a porous crystalline structure.  These pores, or "cages", want to re-absorb water or other molecules.  Aided by strong ionic forces, the Molecular Sieve will absorb a considerable amount of water or other fluids.  If the fluid to be absorbed is a polar compound, it can be absorbed with high loadings even at very low concentrations of the fluid.  This strong absorptive force allows Molecular Sieves to remove many gas or liquid impurities to very low levels (PPM or less).

Temperature & Humidity Considerations:
Molecular Sieves retain their ability to absorb water molecules over a much wider spectrum of temperatures than other desiccant materials.  Molecular Sieves also have a much higher equilibrium capacity for water vapor under very low humidity conditions.   Molecular Sieves are very effective in reducing the water vapor content of gases in the parts per million range.

Regeneration:
Both Type 13X and 4A can be regenerated by evacuating or purging, usually at elevated temperatures.  The purge gas temperature must be sufficiently high to bring the Molecular Sieve to a level of 400-600°F, but not exceed 1000°F.  The degree of regeneration for Type 4A depends on the temperature and humidity of the purge gas and can strongly affect the product purity attainable.  A thoroughly regenerated Molecular Sieve can produce water dew points below -150°F and CO2 levels less than 5 PPMV.   The degree of regeneration for Type 13X depends on the temperature, pressure and humidity of the purge gas and affects the exit stream purity.  It is possible to dry fluids to less than 0.1 PPM H2O and purity to less than 1 PPM total sulfur and CO2.

Why do I need desiccant?

Technical Data:

• Nominal Pore Size:  4 angstroms
• Type of Crystalline Structure:  Cubic
• Bulk Density:  46 lbs./cu. ft.
• Equilibrium Water Capacity:  24% wt.
• Water Content (as shipped):  1.5% wt. (max.)
• Heat of Absorption (max.):  1,800 BTU/lb. H2O
• Specific Heat (approx.):  0.23 BTU/lb./°F

Packaging:  Sold in 30 lb. pails, 110 lb. drums and 300 lb. drums.

Technical Data:

• Nominal Pore Size:  10 angstroms
• Type of Crystalline Structure:  Body Centered Cubic
• Bulk Density:  42 lbs./cu. ft.
• Equilibrium Water Capacity:  29% wt.
• Water Content (as shipped):  1.5% wt. (max.)
• Heat of Absorption (max.):  1,800 BTU/lb. H2O
• Specific Heat (approx.):  0.23 BTU/lb./°F

Packaging:  Sold in 25 lb. pails, 110 lb. drums and 275 lb. drums.

If you are unsure which type and mesh size are required for your dryer, consult your dryer's manual.