ACTIVATED CARBON FILTERS TO ABSORB POLLUTANTS AND ODORS
We are becoming increasingly aware of the negative attributes of our environment. Nuisance and nuisance we no longer tolerate, protecting our environment, our air have become very important aspects.
Activated carbon is generally made from coal, wood, or lignite, peat or coconut shells.
Thermal or chemical activation significantly increases the internal surface area of the carbon through this activation. Pores are subdivided by pore size. Micropores have a diameter of < 1 x 10 m, mesopores of 1-25 x 10 are above 25 x 10 m. In particular, the large number of micropores gives the activated carbon an extremely high internal surface area, which can be between 400 and 1500 m²/g. A few grams of activated carbon soon has an internal surface area the size of a soccer field.
The adsorption of the molecules occurs mainly through the Vanderwaal forces* at the internal surface of the activated carbon. Activated carbon works in both the gas phase and the liquid phase. In addition, activated carbon can be used as a catalyst. Impregnation of the activated carbon with various active substances, such as e.g. metal salts, often allows the absorption of substances that are not or hardly absorbed with unimpregnated activated carbon. This process is called : chemisorption.
* Vanderwaals forces: Intermolecular attraction forces that are considerably weaker than chemical bonds and are caused by weak electrostatic interactions between molecules (the energy is often less than 1 J mol-1). The vanderwaals interaction includes contributions from three effects : permanent dipole-dipole interactions, which occur in every polar molecule; dipole-dipole interactions and induced dipoles, in which a dipole causes a small charge displacement in a well-polarized bond and dispersion forces, which are caused by the time-dependent polarity due to an asymmetric electron distribution around the nuclei. Dispersion forces occur even in atoms of the noble gases.
TYPES OF FILTERS AND PACKAGING
Filtermat can supply you with activated carbon granules in various finished products such as filter cartridges, filter cloths, cylinders and and loose packaging, such as 5l buckets, 25 kg bags.
Feel free to ask for more info so we can offer you the right choice.
PRESSURE DROP 3 MM ACTIVATED CARBON IN AIR
- Moisture when packing 0.5 % max.
- Ash 8% max.
- Liter weight 455 gr/ltr
- Ball Pan hardness, ASTM 97% min.
- benzene adsorption capacity: at p/po=0.9 38% – at p/p0=0.1 31% – at p/p0=0.01 22%
- Iodine ads.Cap. 1000mg/g
- CTC ads. capacity 54% min.
- B.E.T. area 1050 m2/gr.
THE AFFINITY OF ACTIVATED CARBON IN RELATION TO VARIOUS POLLUTANT COMPONENTS
The adsorption capacity of activated carbon is affected by a number of process conditions, such as:
- type and (mutual) concentration of the components.
- moisture content and temperature of the gas stream
- speed of gas flow and contact time
- Pore size and pore distribution of the deployed activated carbon.