ZEOCHEM® Molecular Sieves 4A

Outlines

ZEOCHEM® Molecular Sieve type 4A is an alkali alumino silicate; 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). Zeochem type 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.

Typical Chemical Formula

Na₂O . AI₂O₃ . 2 SiO₂ . n H₂O

Application

• Drying and removing of CO2 from natural gas, LPG, air, inert or atmospheric gases, etc.
• Purification of various gas streams and liquids. (also ammonia syn gas treating)
• Special types are used in the air brake units of buses, trucks and locomotives.
• Packed in small bags, ZEOCHEM® Z4-01 may be used simply as a packaging desiccant.

Regeneration

ZEOCHEM® molecular sieve Type 4A can be regenerated either by heating in the case of thermal swing processes or by lowering the pressure in the case of pressure swing processes.

To remove moisture from a 4A molecular sieve, a temperature of 240-300°C is required. A properly regenerated molecular sieve can give moisture dew points below -100°C.

The outlet concentrations on a pressure swing process will depend on the gas present, and on the conditions of the process

4A - zeolites are available in beads and as powder PURMOL® 4

Please ask for separate data sheets.