Study on Adsorption Properties of 3A Zeolite in Insulating Glass

1, 3A zeolite profile:
  Zeolite Molecular Sieve is a cubic lattice of aluminosilicate compounds. Molecular sieve has a uniform microporous structure, its pore diameter uniform size, these holes can be smaller than its diameter molecules adsorbed inside the cavity, and polar molecules and unsaturated molecules have a preferential adsorption capacity, which can put the pole Different degrees of sexuality, different degrees of saturation, different molecular size and different boiling point molecules separated, that is, "screening" molecules, so called molecular sieve. As the molecular sieve has high adsorption capacity, thermal stability and other advantages of other adsorbents, making the molecular sieve has been widely used.
Second, 3A zeolite performance

       3A zeolite is a powdery crystal with metallic luster, hardness of 3 ~ 5, relative density of 2 ~ 2.8, natural zeolite color, synthetic zeolite is white, insoluble in water, thermal stability and acid resistance with the composition of SiO2 / Al2O3 Than the increase and increase. Molecular sieve has a large specific surface area, up to 300 ~ 1000m2 / g, the inner surface of the highly polarized, as a class of highly efficient adsorbent, but also a class of solid acid, the surface has a high acid concentration and acid strength, can cause positive carbon Ionic catalytic reaction. When the composition of the metal ions exchanged with other ions in solution, the pore size can be adjusted to change its adsorption properties and catalytic properties, so as to prepare different performance molecular sieve catalyst.

Third, 3A zeolite molecular sieve works:
  Adsorption: 3A zeolite adsorption of substances from the physical adsorption, the crystal cavity inside the polarity and Coulomb field, polar molecules (such as water) and unsaturated molecules showed a strong adsorption capacity.
    3A Zeolite Molecular Sieve Function: Molecular sieve pore size distribution is very uniform, only the molecular diameter smaller than the diameter of the hole material can enter the molecular sieve within the crystal. Adsorption of the order of priority and size to distinguish between different substances in the molecule, so the image is called "molecular sieve."
Fourth, 3A zeolite molecular sieve classification:
       Molecular sieves commonly used zeolite digital prefix molecular sieve classification of different structures, such as 3A type, 4A type, 5A molecular sieve. Type 4A is type A in the table with 4Å aperture. A-type zeolite containing Na + is recorded as Na-A. If Na + is replaced by K +, the pore size is about 3Å, which is type 3A zeolites. For example, more than 1/3 of Na + in Na-A is replaced by Ca2 + Is 5Å, which is type 5A Zeolite.
Five, molecular sieve purposes:
       For unsaturated hydrocarbon materials such as pyrolysis gas, propylene, butadiene, acetylene and other industrial dehydration, but also for water, gas, polar liquids (such as ethanol) and natural gas drying. Type 3A has a smaller pore size and can be excluded during water adsorption, all other molecules thus preventing the "co-adsorption" of hydrocarbons.
    3A zeolite molecular sieve regeneration conditions
  (A) removal of water: dry gas can be used such as nitrogen, air, hydrogen, saturated hydrocarbons such as heated to 150-320 ℃ 0.3-0.5kg / m2 pressure into the molecular sieve bed for 3-4 hours, and then Into the adsorber access to dry cold gas for about 2-3 hours, isolated from the air cooled to room temperature.
  (B) the removal of organic matter: water vapor can be used to replace the adsorbate from the molecular sieve, and then heated to (a), regeneration can also be 200-350 ℃ superheated steam or inert gas through the regeneration, (can not be used Gas that comes into contact with the adsorbate to produce an explosive mixture).
  (C) Removal of gaseous substances available decompression removal method regeneration.