Molecular Sieve

Molecular Sieve
1. 20 years professional manufacturer
2.Bead 1.7-2.5mm, 2.5-5mm
3.Pellet 1.6mm, 3.2mm
4.iso 9001:2008


Molecular Sieve



Molecular Sieve 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 maximizes lifetime when dehydrating such molecules.



Typical Chemical Formula
0.4K2O 0.6Na2O Al2O3 2.OSiO2 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
≥98
≥98

Bulk density
g/ml
≥0.65
≥0.65
≥0.70
≥0.70

Wear ratio
%
≤0.20
≤0.25
≤0.10
≤0.10

Crushing strength
N
≥45/cm
≥60/cm
≥30/p
≥70/p

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
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