Disposable activated carbon filters

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in 1972

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Disposable activated carbon filters

Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters Disposable activated carbon filters

1. Type of technology 
Physical and/or chemical/physical adsorption on activated carbon. 

2. Contaminants which can be removed 
Volatile organic compounds (VOC), both soluble or insoluble, the adsorption capacity tends to increase the higher is the molecular weight of the substance to capture. 

3. Emission limits possible 
If dimensioned appropriately, collection efficiencies of 99% can be achieved. Collection efficiency tends to decrease as the degree of saturation of the activated carbon increases. 

4. Description of the equipment and/or process 
This process involves a “condensation” of the solvent from the air on a “certain” solid surface (Van der Waals forces). 
The most frequently used solid surface is that of a high porous carbon mass known as “activated carbons” whose activity is directly proportional to the surface of its porosity, (just think that one gram of activated carbon can have a surface of up to 1250 m2 or even more). The solvent contained in the air to be cleaned is then “condensed” by capillarity, and held in the activated carbon. Hence the adsorption capacity is proportional to the activated carbon surface and is strongly influenced by many other factors such as: concentration of the VOCs to be removed, humidity, temperature, face velocity, contact time and particle size of the activated carbon. 
Each type of solvent is associated with its own particular “isotherm” applicable to each specific quality of activated carbon whose saturation curve can be used for determining the specific dimensioning. Furthermore there is an efficiency curve for each temperature. The adsorption is always an exothermic phase, hence the increase in concentration of the solvents brings about an increase in temperature and a consequent decrease in the degree of adsorption. Normally the temperature should not be allowed to exceed 40°C during operation which should always be kept under 25% of the L.E.L (Concentration data very similar to those prescribed for incinerators). 

In the activated carbon filters manufactured by us, the activated carbon bed is toroidal in shape and the dirty air flows through the bed from inside towards the outside. Such an arrangement makes sure that during the flow through the activated carbon, as the air becomes less laden with contaminant, likewise the face velocity in the activated carbon is decreased, thus increasing collection efficiency. Purpose of such arrangement is to obtain maximum optimization of the activated carbon bed.

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