Abstract: Processes and apparatus for rapidly and efficiently removing liquid from a catalyst slurry comprising catalyst particles. A decanting barrel for dewatering the catalyst slurry may comprise a barrel body having a perforated portion, a reservoir in fluid communication with the perforated portion, and an evacuation conduit in fluid communication with the reservoir. In a process for removing the liquid from the catalyst slurry, the decanting barrel may be disposed in a container, the catalyst slurry may be added to the container, the liquid may be transferred from the catalyst slurry to the reservoir via the perforated portion of the barrel body, and the liquid may be removed from the reservoir via the evacuation conduit.