Process for reducing the polycyclic aromatic hydrocarbon content of carbon black

摘要

The amount of polycyclic aromatic hydrocarbons on the surface of a carbon black can be reduced below 2 ppb by heat treating the carbon black in a fluidized bed. Dried furnace carbon black pellets are charged in a fluid bed unit and preheated. The pellets are then fluidized with air, with the temperature of the bed between 1150° F and 1850° F for 5 to 40 minutes. The carbon black is then quenched and recovered.