Over the last few years, CNG has become a real alternative to petrol. Today’s CNG satisfies engine manufacturers’ call for high-quality, powerful and economic fuel.
CNG typically needs to be dried to a minimum -70 C dew point. Depending on the climate this means that the gas has to contain less than a ½ PPM of water. To dry to this level, we recommend our 3A and 4A Molecular sieves.
Petrotat maintains a large quantity of molecular sieves in stock. Contact us for your CNG drying desiccant needs.
Petrotat 3A Molecular Sieve is a synthetic crystalline aluminosilicate with a regular micropore structure. it is the potassium form of the type A crystal structure. Type 3A 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; and this maximizes lifetime when dehydrating such molecules.
Petrotat 4A Molecular Sieve is a synthetic crystalline aluminosilicate with a regular micropore structure.; it is the sodium form of the Type A crystal structure. 4A molecular sieve has an effective pore opening of about 4 angstroms (0.4nm). 4A molecular sieve will adsorb most molecules with a kinetic diameter of less than 4 angstroms and exclude those larger. Such adsorbable molecules include simple gas molecules such as oxygen, nitrogen, carbon dioxide and straight chain hydrocarbons. Branched chain hydrocarbons and aromatics are excluded.