1:3A,4A,5A,13X Molecular Sieves
2:Adsorbent Molecular Sieves
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Molecular Sieve Detail Description:
Molecular sieve is a material containing tiny pores of a precise and uniform size that is used for gas and liquid.
Molecules small enough to pass through the pores are adsorbed while larger molecules are not. It is different from a common filter in that it operates on a molecular level. For instance, a water molecule may be small enough to pass through while larger molecules are not. Because of this, they often function as a desiccant. A molecular sieve can absorb water up to 22% of its own weight.
Molecular sieves are often utilized in the industry, especially for the purification of gas streams and in the chemistry laboratory for separating compounds and drying reaction starting materials.
The content of natural gas is extremely harmful to the aluminium piping and other parts of the liquefaction apparatus-is used in this case.
Methods for regeneration of molecular sieves include pressure change (as in oxygen concentrators),heating and purging with a carrier gas (as when used in dehydration), or heating under high vacuum.
3A (pore size 3 Å): Adsorbs NH3, H2O, (not C2H6), good for drying polar liquids.
Molecular Sieve 3A is an alkali metal alumina-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.
Often they consist of aluminosilicate minerals, clays, porous glasses, micro porous charcoals, zeolites, active carbons, or synthetic compounds that have open structures through which small molecules, such as nitrogen and water can diffuse.
4A (pore size 4 Å): Adsorbs H2O, CO2, SO2, H2S, C2H4, C2H6, C3H6, EtOH. 4A oecular sieve will not absorb C3H8 and higher hydrocarbons.
Good for drying non-polar liquids and gases.
Molecular sieve 4A is an alkali alumino silicate and able to absorb molecules with their critical diameters no more than 4A; it is the sodium forms of the Type a crystal structure. 4A molecular sieve has an effective pore opening of about 4 angstroms (0.4nm). 4A molecular sieve will adsorb most molecules with a kinetic diameter of less than 4 angstroms and exclude those larger. Such absorbable molecules include simple gas molecules such as oxygen, nitrogen, carbon dioxyde and straight chain hydrocarbons. Branched chain hydrocarbons and aromatics are excluded.
5A (pore size 5 Å): Adsorbs normal (linear) hydrocarbons to nC4H10, alcohols to C4H9OH, and mercaptans to C4H9SH. 5A molecular sieve
will not absorb iso-ompounds or rings greater than C4.
13X (pore size 10 Å): Aborbs di-n-butylamine (not tri-n-butylamine). Useful for drying.
1, Removal of water: hot gas at 200-350c and pressure 0.3-0.5kg/cm2 flows through the molecular sieve bead for 3-4 hours. Let temperature decrease down to 110-180c, cooling.
2, Removal of organics: regeneration is achieved by means of steam treatment to remove organcs, and then remove water with method 1. Room temperature: humidity <=920% no-expose to air, non-contact with water, acid and alkali.
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