Molecular sieve have divided into several types of 3a, 4a, 5a, 13x, 13X APG, 13X HP, Insulating Glass Molecular Sieve, CMS etc.
Specification
3A Molecular Sieve, is an alkali metal alumina silicate.It 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.
4A Molecular Sieve, is an alkali alumina silicate. It has an effective pore opening of about 4 angstroms(0.4nm). It will adsorb most molecules with a kinetic diameter of less than 4 angstroms and exclude those larger.
5A Molecular Sieve, is an alkali alumina silicate. It has an effective pore opening of 5 angstroms(0.5nm). It will adsorb molecules with a kinetic diameter of less than 5 angstrom and exclude those larger.
13X Molecular Sieve, is the sodium form of the type X crystal and has a much larger pore opening than the type A crystals. It will adsorb molecules with a kinetic diameter of less than 10 Angstrom(1.0nm) and exclude those larger.
Application
1. Drying of unsaturated hydrocarbons (e.g. ethylene) 2. Cracked Gas Drying 3. Drying of natural gas, if COS minimization is essential, or a minimum co-adsorption of hydrocarbons is required. 4. Drying of highly polar compounds, such as methanol and ethanol 5. Drying of liquid alcohol 6. Static, (non-regenerative) dehydration of insulating glass units, whether air filled or gas-filled. 7. Drying of refrigerants
