SPI-Chem™ Molecular Sieve

Effective gas adsorbant available in four different pore sizes

Introduction:
Molecular sieves are synthetically produced zeolites characterized by pores and crystalline cavities of extremely uniform dimensions.

More conventional adsorbants of commercial importance are typically described as having pore size ranges that are quite wide relative to the tight pore size distribution found in the SPI-Chem molecular sieve products.

Available products:
The SPI-Chem molecular sieve products are available in four different grades, each one being unique from one another due to their chemical composition and pore size.

Type 3A (3 Å) Molecular Sieve is the potassium form of the Zeolite. Type 3A will adsorb those molecules having a critical diameter of less than 3 Å (0.3 nm) (e.g. He, H, and CO).

Type 4A (4 Å) Molecular Sieve is the sodium form of the Zeolite. Type 4A will adsorb those molecules having a critical diameter of less than 4 Å (0.4 nm) (e.g. ammonia).

Type 5A (5 Å) Molecular Sieve is the calcium form of the Zeolite. Type 5A will adsorb those molecules having a critical diameter of less than 5 Å (0.5 nm) (e.g. methanol, ethane, propane).

Type 13X is a modified form of the sodium zeolite with a pore diameter of 10 Å (1 nm). Molecules of chloroform, carbon tetrachloride and benzene can be adsorbed on Type 13X Molecular Sieves.

Temperature and Humidity Considerations:

Another important adsorption characteristic of molecular sieve is its ability to continue adsorption process at temperatures which would cause other desiccants to desorb trapped contaminant molecules. In a gas drying system, water will continue to be adsorbed even though the process temperature may be in excess of 149° C (300° F). It must be understood, however, that the adsorption capacity of all desiccants is negatively affected by temperatures in excess of 37.7° C (l00° F). Molecular sieves, though, retain their ability to adsorb water molecules over a much wider spectrum of temperatures than any other desiccant material.

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.

Particle Size and Configuration:

Molecular Sieves are ceramic-appearing pellets and have the lowest dusting factor of any commercially available desiccant. The pellets do not change size or shape upon reaching saturation.

Select from four different molecular sieve products:

Type 3A (3 Å) Molecular Sieve

Type 4A (4 Å) Molecular Sieve

Type 5A (5 Å) Molecular Sieve

Type 13X (10 Å) Molecular Sieve

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