Zeolite Molecular Sieves
Zeolite molecular sieves are crystalline, highly porous materials, which belong to the class of alumino silicates.
These crystals are characterised by a three-dimensional pore system, with pores of precisely defined diameter. This diameter is in the dimension of the size of molecules such as water, CO2 and H2S. The pores can be adjusted to precisely determined uniform openings allowing for molecules smaller than its pore diameter to be adsorbed whilst excluding larger molecules, hence the name “molecular sieve”. The different pore sizes of synthetic zeolites open up a wide range of possibilities in terms of "sieving" molecules of different size or shape from gases and liquids.
Grace Davison zeolite molecular sieves are purely synthetic materials and are characterized by the following properties:
Molecular sieves are manufactured by crystallisation from aluminium hydroxide, sodium hydroxide and waterglass. Unter carefully controlled conditions, the crystallisation process produces the required sodium alumino silicate structure. The zeolite crystals can the be ion exchanged to adjust the pore size. "Add "formed" between The and zeolite:" The formed zeolite crystals can the be ion exchanged to adjust the pore size. After drying the molecular sieve crystals can either be processed to activated zeolite powder, or a small quantity of binder is added, forming the material into beads. These beads are dried, calcined and finally screened to the required particle size prior to packaging.
The unique properties of zeolitic molecular sieves have led to the development of a broad range of Grace Davison zeolite adsorbent products such as zeolite beads, powders, polymer desiccants, mono/miniliths, drying bars and castor oil paste.