The solvent recovery process relies on high-quality activated carbon grades with a well-balanced pore structure. While the micro-pores are crucial to solvent retention and hence, compliance with the prescribed VOC emission limits, the access pores in the macro- and meso-pore range facilitate desorption of the solvents from the activated carbon.
The activated carbon is charged in fixed-bed adsorbers and should offer as low a flow resistance as possible. This is the reason why 4mm extruded carbon pellets are the adsorbents of choice for this application. Depending on the type of solvent to be removed, activated carbon grades of different raw material origins or low-ash carbon grades are employed to give the best treatment result.
