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What are Volatile Organic Compounds?

March 26, 2024

Organic chemical materials are found everywhere in the environment because they have become essential ingredients in many products and materials.

Volatile organic compounds (VOCs) are the vapours of organic chemical compounds which are a large class of substances that include complex substances used as solvents and hydrocarbons. Many of these have a low boiling point which makes it possible for them to evaporate under normal indoor atmospheric conditions of temperature and pressure, therefore becoming a volatile chemical.

Why Are VOCs A Concern?

Many manufacturing operations such as the production of chemicals, pharmaceuticals, or coating or printing processes, use these organic compounds as solvents or reactive chemicals. In the exhaust airflows from these production processes, they easily evaporate or vaporise and can be released into the exhausted air as Volatile Organic Compounds (VOCs).

Many waste-handling processes also release these VOCs into the air. In addition, inside buildings, such vapours can also be released into the air from the use of products and materials containing VOCs.

VOCs are therefore of a concern as both indoor and outdoor air pollutants as there is the potential for VOCs to adversely impact human health from their exposure. In the wider environment, they can create photochemical smog under certain conditions.

VOCs and Activated Carbon

As VOCs are organic, this means that most of them are readily adsorbed onto activated carbon. Adsorption is the process by which these gaseous molecules are attracted and concentrated on the carbon surface where they are bound or adsorbed into the pores of the activated carbon.

VOCs can therefore be effectively removed from the air with activated carbon and in most cases, the activated carbon can be recycled by reactivation for reuse. The ability to reactivate or recycle activated carbon makes it a cost-effective and sustainable solution to remove VOCs from the air.

What Volatile Organic Compounds Can Be Removed Using Activated Carbon?

Activated carbon, in all its forms, has excellent adsorption capacity for a wide range of VOCs from air. However, for the most effective impurity removal, different carbon types may be required, depending on the combination of pollutants such as if it is an organic or inorganic impurity or compound. Many of these pollutants can also be effectively removed from gaseous streams other than air such as Nitrogen or Carbon Dioxide (CO2).

Some of the typical volatile organic pollutants that can be effectively removed from the air using activated carbon include the following:

Acetic acid Dichloromethane (DCM) / Methylene chloride Nitriles
Acetone 1,4-Dioxane Octane
Acetonitrile Dioxins Odour
Acrolein Epichlorohydrin  
Acrylate   Ozone
Acrylic acid Esters Pentane
Acrylonitrile Ethanol Pentanol
Alcohols Ethers Pentene
Aldehydes Ethyl acetate PFAS
Aliphatic Compounds Ethyl acrylate Phenol
Alkanes Ethylene dichloride  
Amides Ethylene oxide Propane
Amines Glycol ethers Propanol
Aniline Halogenated Hydrocarbons Propionaldehyde
Aromatic Compounds Heptane Propylene
Benzene Heptanol Propylene Oxide
BTX Heptene Pyridine
1,3-Butadiene Hexane Siloxanes
Iso-butane Hexanol Solvents
Butane Hexene Styrene
Butanol Hydrocarbons Tars
Butyl acetate Isopropyl acetate Terpenes
Carbon Tetrachloride Isopropyl alcohol/isopropanol Tetrachloroethane
Chlorine (CL2) Ketones Tetrachloroethylene/ Perchloroethylene (Perc)
Chlorinated Solvents Methanol Tetrachloromethane
2-Chloro-1,3-butadiene Methyl acetate Tetrahydrofuran
Chlorobenzene Methyl acrylate Toluene
Chloroethane Methylamine Toluidine
Chloroform Methyl chloride Trichlorobenzene
Chloromethane Methyl ethyl ketone (MEK) Trichloroethane
Chloropropane Methyl isobutyl ketone (MIBK) Trichloroethylene (TCE)
Cresol Methyl isocyanate Trichlorofluoromethane
Cumene Methyl Mercaptan Trichloromethane
Cycloalkanes Methyl methacrylate Triethylamine
Cyclohexane Methyl tert-butyl ether (MTBE) Trimethylbenzene
Cyclohexanone Mineral Spirit Vinyl acetate
Dichlorobenzene Naphthalene Vinyl chloride
Dichlorodifluoromethane Nitrobenzene Volatile Organic Compound (VOC)
Dichloroethane Nitrotoluene Xylene

How can we help?

The most effective carbon to be used for a particular application-specific type may depend on the nature of the exhaust air to be treated, the plant operating process conditions, the contaminants to be removed and the emission levels that the cleaned exhaust air needs to meet.

If this is required for a new treatment process, why not consider the use of a mobile carbon filter. These are activated carbon filters that can be both used on-site as a VOC purification vessel and then transported to and from the site, without the need for any on-site carbon exchange.

If you need help with the choice of activated carbon, the help of our mobile carbon filter service or just some further advice, please contact us – contact our technical team