This phenomenon allows a separation of the molecules of interest from the fluid phase, until the surface of the solid material is fully saturated.
So, what material should be used for this application? At an intuitive level, we can deduce that the adsorption of chemical species is more favored the greater is the contact surface between the same molecules and the solid. It is necessary therefore the use of a material characterized by high porosity and a high specific surface area (per unit of volume).
An excellent material that meets these requirements is the activated carbon. This substrate is first generated by a high carbon content, by means of chemical or gas activation processes.
Placing the active carbon within a suitable apparatus, and by imposing the passage of the gas stream through the coal itself, it realizes the separation of the VOC present in the fluid phase. This is the principle behind the activated carbon filter.
On the basis of this technology, Tecnosida® has realized the Chemsorb® filter, used with success in various applications like:
We have examined the adsorption phenomenon, which typically involves a fluid phase and a solid phase. What if instead we consider two fluid phases, specifically a gas and a liquid? Even in this case it can take place an exchange of matter, according to a physical phenomenon called absorption. Let’s examine it in more detail, with the equipment that uses the operation: the wet scrubber.