ZEOCHEM® Molecular Sieves 3A

Outlines

ZEOCHEM® Molecular Sieve type 3A is an alkali metal alumino-silicate; it is the potassium form of the typ 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 maximises lifetime when dehydrating such molecules.

Typical Chemical Formula

0,45 K₂O . 0,55 Na₂O . Al₂O₃ . 2 SiO₂ . n H₂O

Application

• Drying of unsaturated hydrocarbons (e.g. ethylene, propylene, butadien)
• Cracked Gas Drying
• Drying of natural gas, if COS minimization is essential, or a minimum co-adsorption of hydrocarbons is required.
• Drying of highly polar alcohol compounds, such as methanol and ethanol.
• Drying of refrigerants (e.g. R22, R134a etc)

Regeneration

ZEOCHEM® molecular sieve Type 3A can be regenerated either by 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.

3A - zeolites are available in beads and as powder PURMOL®3

Please ask for separate data sheets.