Description

Activated carbon air filters to remove chemical vapours and odours

Corrosion-resistant PVC filter housings with activated carbon system for air filtration and removal of chemical compounds and odours. Activated microporous carbon attracts airborne molecules of chemical compounds or gases, thus cleaning the air of invisible pollutants and odours.

The corrosion-resistant PVC filter housing ensures that filtering of various chemical vapours, such as acids or solvents, will prevent damage.

What is activated carbon?

Activated carbon is a microporous granular material made from peat, wood or fossil carbon. The activation process produces millions of molecular size pores, creating a huge surface area of up to 2000 m² per gram of carbon. The Van der Waals forces on the inner surface of the activated carbon cause the carbon atoms to attract nearby gas molecules – this is called adsorption.

Depending on the molecular structure of the substances being sucked up, some molecules are more strongly attracted, others more weakly. Thanks to this mechanism, activated carbon air filters can remove one or more components of the mixture from the air stream.

Factors influencing filter selection

Activated carbon air filters are selected with the following parameters in mind:

• Treated air flow

• The composition of the filtered air and the concentration of pollutants

• Required filtration efficiency

• Maximum operating temperature up to 60°C

• Relative humidity not more than 70%

Factors reducing the effectiveness of activated carbon

• Temperature – the higher the temperature, the lower the adsorption of carbon. Lower temperature ensures better efficiency.

• Moisture – relative humidity above 70% has a negative effect on the adsorption capacity of carbon.

• Dust – clogs carbon pores and reduces efficiency, increasing pressure losses. It is recommended to install a mechanical dust filter before the activated carbon filter.

Recommended operating conditions

• Contact time between air and activated carbon – 0.05 to 0.2 sec.

• The carbon must be densely packed – loose slabs or large pellets of carbon do not work well.

• The filter must operate in vacuum (Extraction) mode.

• It is not recommended to use activated carbon filters that are too small.

Manufacturer’s catalogue: filterbox.pdf

More industrial filtration units: dust filtration units