
Molecular Sieve (Zeolite)
The chemical formula of zeolite unit cell:
Mx/n [ (AlO2)x (SiO2)y ] ·H2O
Mx/n: Metal cations, to maintain charge balance in crystal
(AlO2)x(SiO2)y: Skeleton of zeolite, with different shapes hole and pore
H2O: Chemical and physical adsorption of water, physical adsorption of water can desorption under certain conditions
Type | Pore Size | Molecules excluded | Application |
Molecular Sieve 3A |
3 angstrom | Most except H2O, NH3 |
This product is mainly used in commercial dehydration of unsaturated hydrocarbon streams, including cracked gas, propylene, butadiene, acetylene; drying polar liquids such as methanol
and ethanol. |
Molecular Sieve 4A |
4 angstrom |
Propane(Adsorbed species include SO2, CO2, H2S, C2H4, C2H6, and C3H6) |
Preferred for static dehydration in closed liquid or gas systems, e.g., in packaging of drugs, electric components and perishable chemicals; water scavenging in printing and plastics
systems and drying saturated hydrocarbon streams. Generally considered a universal drying agent in polar and nonpolar media. |
Molecular Sieve 5A |
5 angstrom |
All 4-carbon rings, iso-compounds
(Molecules adsorbed include C3H8, nC4H8, nC4H9OH, |
Separation of normal paraffins from branched-chain and cyclic hydrocarbons; removal of H2S, CO2 and low MW mercaptans from natural gas. |
Molecular Sieve 13X |
10 angstrom |
Effective diameter >10Å, ie (C4F9)3N |
Commercial gas drying, air sepration plant feed gas purification (simultaneous H2O and CO2 removal) and liquid hydrocarbon/natural gas sweetening (H2S and high MW mercaptan removal). |
Special Molecular Sieve |
N/A |
N/A |
Use special molecular sieve in the particular field to get a much better effect.
Insulating Glass |