Activated carbon can be used in its pure state to remove organic contaminants from air and gases, or impregnated to retain gaseous contaminants not retained by a standard activated carbon, these carbons are chemically impregnated, for acid gases, organic vapors, mercury vapors, ammonia vapors and low molecular weight amines.
Chemically modified activated carbons complement the natural functions not covered by a conventional activated carbon to retain other compounds. This enhances the neutralization and adsorption of an activated carbon.
Some of the natural gas reserves contain trace concentrations of mercury. Mercury removal is particularly important in the production of liquefied natural gas LNG, as mercury can cause corrosion of aluminum heat exchangers used in this process. In addition to the use in cartridge respirators (face masks) for sites with gas phase mercury contamination.
Various types of gases such as ethylene, natural gas and biogas are desulfurized using activated carbon. Activated carbon can be used for H2S removal in biogas streams, anaerobic digesters (AD), landfills or municipal wastewater treatment plants.
Ammonia and amines
Activated carbon can also be used to purify gas containing amines in natural gas or ammonia scrubbing systems.
In order to protect compressor parts, and also as an aid to efficiency, activated carbon is used to remove traces of lubrication oil in the air stream.
Fruit and vegetable storage – Low oxygen level
Activated carbon is used in purification systems to control carbon dioxide and ethylene in fruit storage facilities to prevent premature ripening or spoilage.
Hydrogen purification by adsorption
Activated carbon can be used to adsorb organic impurities during the process of continuous hydrogen separation (from methane/vapor hydrogen reforming) or other gas separations. By pressure swing.
New gas adsorption systems utilize the inherent properties of an adsorbent such as activated carbon and its general propensity for gas storage, whereby under pressure conditions the widely developed carbon porosity allows a large increase in the storage volume of a pure gas such as carbon dioxide or nitrogen, or a mixture of gases such as air.
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