Freeze Tower Drying Molecular Sieve
1.According to the selection of molecular polarity, unsaturation and polarizability, the adsorption molecular sieve has a high affinity for polar molecules and unsaturated molecule
2.Molecules with lower boiling points are less likely to be adsorbed by molecular sieves.
3.Among non-polar molecules, it has higher polarizability for molecules
Produkteinführung
Freeze tower drying molecular sieve is a class of crystalline aluminosilicates, which has many excellent characteristics due to their uniform pore size and extremely high specific surface area.
① Selective adsorption according to the size and shape of the molecule, that is, only those molecules smaller than the pore size of the molecular sieve are adsorbed.
② For small polar molecules and unsaturated molecules, it has selective adsorption performance. The greater the polarity, the higher the degree of unsaturation, and the stronger the selective adsorption.
③ It has strong water absorption. Even at higher temperatures, higher air velocities and lower water content, there is still a fairly high water absorption capacity.
Basic Features:
a) Freeze tower drying molecular sieve can reversibly adsorb and desorb water or various gas and liquid compounds.
b) Metal cations are easily exchanged.
c) The cavities and channels inside the molecular sieve form a very high internal surface area. Its inner surface may be 10,000-100,000 times higher than the outer surface area of the molecular sieve particles.
Our Lab:
Select adsorption according to different molecular size and shape - molecular sieve effect molecular sieve crystal has a honeycomb structure, the crystal cavities and pores in the crystal communicate with each other, and the pore size is uniform and fixed (the diameter of the molecular sieve cavity is generally 6-15 angstroms) The size of the molecule is comparable to that of ordinary molecules. Only those molecules with relatively small diameters can be adsorbed by freeze tower drying molecular sieve through zeolite pores, while molecules with large configurations cannot be adsorbed by molecular sieves because they cannot enter the zeolite pores. Silica gel, activated alumina and activated carbon have no uniform pore size, and the pore size distribution range is very wide, so they have no screening performance.
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