Distribution of molecular sieves Zeochem


Zeochem, a manufacturer of high quality molecular sieves and chromatography gels, was established more than 190 years ago and its headquarters is still based at the original location on Lake Zurich, Switzerland. Zeochem is a fully owned subsidiary of CPH Chemie + Papier Holding AG.

With manufacturing facilities in Uetikon, Switzerland and Louisville, USA, we offer to our customers a wide range of high performance products and provide coordinated global support to all molecular sieve adsorbent and silica gel markets.

Process industry applications.

Natural gas processing. Dehydration of natural gas and natural gas liquids such as propane and butane. Removal of CO2 , H2S, mercaptans and other impurities from natural gas or natural gas liquids.

Hydrogen production or recovery. Drying and purification of H2 using either thermal swing or pressure swing adsorption.

Basic petrochemical and synthesis gas processes.

Purification of natural gas feed. Drying and purification of the reformer gas prior to the ammonia loop. Treating of ammonia off-gas streams. Olefin and polyolefin production. Drying of cracked olefin gas, ethylene and propylene products. Dehydration and purification of ethane feed to the cracker. Impurity removal from polyolefin plant feed (catalyst protection from oxygenates, sulfides)

Industrial gases.

Dehydration and CO2 removal from air for cryogenic processing. Separation of high-purity oxygen from air via Pressure Swing Adsorption (PSA) or Vacuum Swing Adsorption (VSA). Recovery of inert gases by adsorption.

Petroleum refining.

Dehydration of light-ends (e.g. olefin) for cryogenic recovery Purification of feed to catalytic processes such as isomerization, dimerization and alkylation units.

Chemical storage.

Underground cavern drying and treating. Storage tank breathers. Product recovery from vent streams

Fuel ethanol production.

Bulk water removal at the azeotrope. Purification of food- and pharmaceutical-grade ethanol.

Miscellaneous Petrochemicals.

Drying of solvents. Purification of feed streams to catalytic processes such as for ethyl benzene.

Industrial Applications.

Insulating glass. Prevention of condensation in the insulating glass space of windows.

Package protection. Dehydration and trace contamination removal in enclosed spaces. Removal of odors.

Pollution and VOC.

Control containment and concentration of solvent vapors.

Polymer processing. Removal of water of reaction in urethane formulations. Cell size control in blown foams. Plastic pellet driers prior to blow or injection molding.

Systems protection devices. Dehydration and filtration of refrigerant loops. Dehydration and purification of compressed breathing air. Dehydration of compressed air for pneumatic tools. Truck and railroad air brake driers.

Medical uses. Oxygen concentrators for respiratory therapy.


Some of the more common types of molecular sieves and some typical applications include the following:

Type 3A

Will exclude most molecules except water. Type 3A is used for drying natural gas, ethanol and reactive monomers such as olefins etc. Type 3A is usually made by ion-exchanging potassium onto Type 4A in place of sodium.

Type 4А

The sodium form of Type A is widely used as a general purpose drying agent. Under certain conditions it can also be used for removal of carbon dioxide.

Type 5А

This is the calcium-exchanged form of the Type A zeolite. The strong ionic forces of the divalent calcium cation make 5A an excellent choice for removing carbon dioxide, carbon monoxide, hydrogen sulphide and other weakly polar molecules. This product is also effective for the bulk separation of normal and iso-paraffin hydrocarbons.

Type 13Х

The sodium form of zeolite X has a much larger pore opening than the Type A crystals. It also has the highest theoretical capacity of the common adsorbents and very good mass transfer rates. Type 13X removes impurities too large to fit into the Type A zeolites and is also often used to separate nitrogen from air to produce a high purity oxygen stream.

Тype Y

Similar in structure to the Type X, Type Y has a higher silica to alumina ratio, offering some improved adsorption of hydrophobic compounds and imparting some acid resistance.


Pentasil is also known as Zeolite MFI or ZSM-5. A high silica/alumina ratio makes this family hydrophobic and an excellent choice to adsorb selectively organic impurities from aqueous liquids or from water-laden gas streams such as air.


This zeolite is a highly acid resistant adsorbent or catalyst carrier.