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Molecular Sieves 3A

Molecular Sieve 3A is an alkali metal aluminosilicate; Molecular sieve 3A is the potassium form of the type A crystal structure. Molecular sieve 3A adsorbs molecules with effective diameters small than 3 anstrom (0.3nm) such as water and exclude molecular.

Molecular Sieves 

Molecular sieves are crystalline metal aluminosilicates having a threedimensional interconnecting network of silica and alumina tetrahedra. Natural water of hydration is removed from this network by heating to produce uniform cavities which selectively adsorb molecules of a specific size.

A 4 to 8-mesh sieve is normally used in gasphase applications, while the 8 to 12-mesh type is common in liquidphase applications. The powder forms of the 3A, 4A, 5A and 13X sieves are suitable for specialized applications.

Long known for their drying capacity (even to 90°C), molecular sieves have recently demonstrated utility in synthetic organic procedures, frequently allowing isolation of desired products from condensation reactions that are governed by generally unfavorable equilibria. These synthetic zeolites have been shown to remove water, alcohols (including methanol and ethanol), and HCl from such systems as ketimine and enamine syntheses, ester condensations, and the conversion of unsaturated aldehydes to polyenals.

Molecular Sieves 3A

Molecular Sieve 3A is an alkali metal aluminosilicate; Molecular sieve 3A is the potassium form of the type A crystal structure. Molecular sieve 3A adsorbs molecules with effective diameters small than 3 anstrom (0.3nm) such as water and exclude molecular.

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Composition:  0.6 K2O: 0.40 Na2O : 1 Al2O3 : 2.0 ± 0.1SiO2 : x H2O

Description:   The 3A form is made by substituting potassium cations for the 
                       inherent sodium ions of the 4A structure, reducing the effective
                       pore size to ~3Å, excluding diameter >3Å, e.g., ethane.

Applications:  Commercial dehydration of unsaturated hydrocarbon streams,
                       including cracked gas, propylene, butadiene, acetylene; drying
                       polar liquids such as methanol and ethanol. Adsorption of
                       molecules such as NH3 and H2O from a N2/H2 flow. Considered a
                       general-purpose drying agent in polar and nonpolar media.


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Molecular Sieve 3A is made from zeolite powder 3A (>70%) and binder. Zeolite powder 3A is a potassium based type A zeolite, which is generated by replacing part of sodium cation in 4 angstrom sieve. Molecular sieve 3A is usually used for dehydration. Since it only adsorb molecule with diameter less than 3 anstroms. Molecular sieve 3A is a perfect adsorbent if you only want to remove water from gas mixture in most condition. Molecular Sieve 3A have the shape of beads and pallets.

Storage:

Keep 3A molecular sieve in an air tight container until ready for use to avoid unintended moisture adsorption.

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Molecular Sieves 3A 1178904