Abstract: A dispersion apparatus for agitating particulate mass in a rotating drum. The dispersion apparatus comprises a plurality of perforated flights radically extending from the inner surface of the rotating drum which rotates about an operatively longitudinal axis. The perforated flights are provided with at least one perforation. The perforated flights have the advantage of increasing the throughput of the rotating drum unit, reducing the time required for heating and mass transfer by increasing the contact surface of the perforated flights with the particulate mass to be dispersed by the dispersion apparatus.