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Molecular Sieve 3A, 4A, 5A, 13X

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Molecular sieve 3A

  • drying ethanol;
  • drying of ethylene;
  • methanol drying;
  • dehydration of natural gas;
  • drying propylene;
  • static dehydration of air-filled double-glazed windows;
  • static gas dehydration;
  • drying of butadiene;
  • cracking gas drying.

Type 3A molecular sieve is an alkali metal aluminosilicate that is the potassium form of the type A crystal structure. Type 3A has an effective pore opening of about 3 angstroms (0.3 nm). It is large enough to allow moisture to pass through, but excludes molecules such as unsaturated hydrocarbons that can potentially form polymers and this increases the dehydration life of such molecules.

Molecular sieve 4A

  • deep drying of air, natural gas, alkalis, refrigerants and other gases and liquids;
  • static drying of pharmaceutical packaging, electronic components and perishable items;
  • air conditioning and purification.

Type 4A molecular sieve is an alkali metal aluminum oxide silicate that is the sodium form of type A crystal structure. 4A molecular sieve has an effective pore opening of about 4 angstroms (0.4 nm). Guangdong Xintao type 4A molecular sieve adsorbs most molecules with a kinetic diameter of less than 4 angstroms and excludes larger molecules. Such adsorbed molecules include simple gas molecules such as oxygen, nitrogen, carbon dioxide, and straight chain hydrocarbons. Branched chain hydrocarbons and aromatic hydrocarbons are excluded.

Molecular sieve 5A

  • conventional wax separation process;
  • purification of refrigerant SF6 for power industry removal of moisture and hydrocarbons;
  • oxygen hydrogen PSA (pressure swing adsorption).

Molecular type 5A is an alkaline alumina silicate; it is the calcium form of the type A crystal structure. Type 5A has an effective pore opening of 5 angstroms (0.5 nm). It will adsorb molecules with a kinetic diameter of less than 5 angstroms and exclude those larger. It is particularly suitable for PSA adsorption where it can be used to separate normal and isoparaffins (C4-C6 varieties) in PSA hydrogen purification and oxygen concentrators.

Molecular sieve 13X

It is the sodium form of the Type X crystal and has much larger pores than Type A crystals. It will adsorb molecules with a kinetic diameter less than 10 angstroms (1.0 nm) and exclude those larger. It also has the highest theoretical capacity among conventional adsorbents and very good mass transfer rates. It can remove impurities too large to fit in a Type A crystal and is commonly used to separate nitrogen from oxygen. The 13X type molecular sieve can be regenerated either by heating in case of thermal oscillation processes; or pressure reduction in the case of pressure swing processes. A 13X molecular sieve requires a temperature of 250–300 C to remove moisture. A properly regenerated molecular sieve can produce moisture dew points below -100 C or mercaptan or CO2 levels below 2 ppm. Outlet concentrations during the pumping process will depend on the gas present and on the process conditions. 13X - Zeolite is available in 1-2mm (10x18mesh), 2-3mm (8x12mesh), 2.5-5mm (4x8mesh) granules and powder, as well as 1.6mm granules, 3 .2 mm.

The 13X APG molecular sieve is specially designed for co-absorption of CO2 H2O in the air cryo-separation industry. It has larger capacity and higher adsorption rate to remove CO2 H2O to prevent gelation in the bed, it is suitable for any size and type air cryo separation plant in the world.

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