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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 . nH2O
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 compounds, such as methanol and ethanol
- Drying of liquid alcohol with Z3-01 / 1-2 mm beads
- Static, (non-regenerative) dehydration of insulating glass units, whether air filled or gas-filled.
- Drying of refrigerants (e.g. R22, R134a etc)
ZEOCHEM® Types
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Z3-01
Z3-02
Z3-03
Z3-04
Z3-06
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Standard 3A Grade
Olefin (Cracked Gas) Grade
Ethanol Dehydration Grade
Natural Gas drying
same as Z3-04 (in USA)
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3A-8KM
ISOMOL
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Refrigerant Dehydration Grade
For Insulating Glass only (3A)
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Regeneration
ZEOCHEM® molecular sieve Type 3A can be regenerated by either 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 of 1-2 mm, (10x18 mesh) 2-3 mm, (8x12 mesh)
2.5-5 mm, (4x8 mesh) and as powder PURMOL®3
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