Trickle Bed
Trickle bed reactors are solid-liquid-gas contacting devices wherein a liquid stream flows downward over a bed of catalyst with pressure difference serving as the driving force . The fluid flows over catalyst particles and forms fine films, rivulets or droplets. The gas stream can either flow concurrent with the liquid or countercurrent to it through the bed. Trickle bed reactors are primarily operated in continuous mode but are sometimes used in semi-batch processes.