Molecular Sieve

 

MS

Molecular Sieve Crystal Structure of Shanghai Molsiv Adsorbent

Summary:

Molecular Sieve (as known as synthetic zeolite) is a micro-porous aluminosilicate crystals. It is made of silicon-oxy tetrahedron, alumina tetrahedron to form a basic skeleton structure, in which exist metal cations (e.g. Na+, K+, Ca2+, etc.) to balance the excess negative charge in the crystal. According to the type of crystal structure, zeolite consists of: A-type (LTA), X-type (FAU), Y-type and so on.

 

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

Properties:

Moleculars adsorbed and excluded by Shanghai MolsivCN Adsorbent
Type Pore Size Molecules excluded Application

MS 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. 

MS 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.

MS 5A

5 angstrom

All 4-carbon rings, iso-compounds

(Molecules adsorbed include C3H8, nC4H8, nC4H9OH,
nC4H10~nC22H46)

Separation of normal paraffins from branched-chain and cyclic hydrocarbons; removal of H2S, CO2 and low MW mercaptans from natural gas.

MS 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
Refrigerant
Automobile
Ethanol Dehydration
Hydrogen Purification
Oxygen Generation
Desulfurization