Molecular Sieve type 3A 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 maximize 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 / Cylindrical |
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 |
≥0.64 |
≥0.64 |
≥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 |
% |
≥21 |
≥21 |
≥21 |
≥21 |
|
Ethylene adsorption |
‰ |
≤3.0 |
≤3.0 |
≤3.0 |
≤3.0 |
|
Water content, as shipped |
% |
≤1.5 |
≤1.5 |
≤1.5 |
≤1.5 |
Typical 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
- Static, (non-regenerative) dehydration of insulating glass units, whether air filled or gas-filled.
- Drying of refrigerants
