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3A Molecular Sieve is an alkali metal alumino-silicate; it is the potassium form of the type 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 . 4.5H2O
SiO2 : Al2O3 ≈2
Technical Parameter
| Item |
Unit |
Technical data |
|||
|
Shape |
Pellet |
Sphere |
|||
|
Diameter |
mm |
1.5-1.7 |
3.0-3.3 |
1.7-2.5 |
3.0-5.0 |
|
Size ratio up to grade |
% |
≥98 |
≥98 |
≥96 |
≥96 |
|
Bulk density |
g/ml |
≥0.68 |
≥0.68 |
≥0.68 |
≥0.68 |
|
Wear ratio |
% |
≤0.20 |
≤0.25 |
≤0.10 |
≤0.10 |
|
Crushing strength |
N |
≥45/cm |
≥60/cm |
≥30/piece |
≥70/piece |
|
Static water adsorption |
% |
≥20 |
≥20 |
≥20 |
≥20 |
|
Ethylene adsorption |
% |
≤3.0 |
≤3.0 |
≤3.0 |
≤3.0 |
|
Water content, as shipped |
% |
≤1.5 |
≤1.5 |
≤1.5 |
≤1.5 |
Typical Application
1) Drying of unsaturated hydrocarbons (e.g. ethylene, propylene, butadien)
2) Cracked Gas Drying
3) Drying of natural gas, if COS minimization is essential, or a minimum co-adsorption of hydrocarbons is required.
4) Drying of highly polar compounds, such as methanol and ethanol
5) Drying of liquid alcohol
6) Static, (non-regenerative) dehydration of insulating glass units, whether air filled or gas-filled.
7) Drying of refrigerants
Regeneration
XINTAO 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.
Size
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, and in pellet 1.6, 3.2.
Attention
To avoid damp and pre-adsorption of organic before running, or must to be reactivated.
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