5A Molecular Sieve
Molecular Sieve type 5A is an alkali alumino silicate; it is the calcium form of the Type A crystal structure. The pore size of 5A molecular sieve is about 5 Å . It can adsorb all kinds of molecular smaller than this size, it is mainly used in separation of the normal and isomerous alkane, pressure swing adsorption (PSA) for gases, co-adsorption of moisture and carbon dioxide.
Typical Chemical Formula
0.75 CaO . 0.25 Na2O . Al2O3 . 2 SiO2 . 4.5H2O
SiO2 : Al2O3 ≈ 2
Technical Property of Molecular sieve 5A
|
Item
|
Unit
|
Technical data
|
|||
|
Shape
|
|
Pellet
|
Sphere
|
||
|
Diameter
|
mm
|
1.5-1.7
|
3.0-3.3
|
2.0-2.8
|
2.8-4.75
|
|
Size ratio up to grade
|
%
|
≥ 98
|
≥ 98
|
≥ 96
|
≥ 96
|
|
Bulk density
|
g/ml
|
≥ 0.64
|
≥ 0.64
|
≥ 0.66
|
≥ 0.66
|
|
Wear ratio
|
%
|
≤ 0.20
|
≤ 0.40
|
≤ 0.20
|
≤ 0.20
|
|
Crushing strength
|
N
|
≥ 30/cm
|
≥ 45/cm
|
≥ 30/piece
|
≥ 60/piece
|
|
Static water adsorption
|
%
|
≥ 21.5
|
≥ 21.5
|
≥ 21.5
|
≥ 21.5
|
|
Static normal hexane adsorption
|
%
|
≥ 12
|
≥ 12
|
≥ 12
|
≥ 12
|
|
Water content, as shipped
|
%
|
≤ 1.5
|
≤ 1.5
|
≤ 1.5
|
≤ 1.5
|
Applications
Oxygen/hydrogen PSA (Pressure Swing Adsorption) process
Remove of water and carbon dioxide from air.
Type 5A Separate normal paraffins from branched-chain and / cyclic hydrocarbons through a selective adsorption process.
Type 5A Separate normal paraffins from branched-chain and / cyclic hydrocarbons through a selective adsorption process.
Ethanol refinement (moisture, CO2, etc. )
Regeneration
Molecular Sieve Type 5A can be regenerated by pressure swing or purging, usually at elevated temperatures. The purge gas temperature must be sufficiently high to bring the molecular sieve to a level of 200° C - 350° C.