The wet removal process utilizes the physical phenomenon of VOC diffusion from gaseous phase to the liquid according to dissolving capacity of process liquid used and the different component concentration in both fluids.
The physical absorption into the solvent takes place until the conditions of balance between the phases are reached, according to Henry’s law.

As the absorption process takes place between a liquid phase and a gaseous phase, it arises that one among the fundamental parameters is the available surface for the transfer.
This is the reason why the most common plants that carry out the absorption on an industrial level are towers with packing, towers with spray action or towers with plates, where a sensible increase of contact surface is obtained respectively by means of packing bodies, a forced liquid atomization or gas scrubbing through the liquid in a condition of extreme turbulence.

TECHNOLOGY LIMITS

• Gas purification through absorption towers causes the formation of solutions (generally aqueous) that contain VOC. These must be subjected to a treatment or a distillation in order to separate the solution from the solvent before the subsequent recuperation
• The VOC must be soluble in the liquid used for the absorption