A device for distributing a poly-phase mixture having a gas phase and
liquid phase which mixture is in downflow mode through at least one bed
of granular solid. The device has at least one tray (P) located above one
of the beds of granular solid. It further has mixer conduits (21) for the
liquid and gas phases, each conduit having an upper cross section for
flow (22) allowing the passage of the majority of the gas phase, and a
lower cross section for flow (23) allowing the mixture formed inside the
conduits to communicate with a bed of granular solid. The mixer conduits
(21) also having one or more lateral cross sections for flow (26) over at
least a portion of their height to allow the passage of the liquid phase
and possibly a minor portion of the gas phase inside the mixer conduits.
The device also has a jet breaker type dispersive system (28) having a
controlled porosity disposed below the lower cross section for flow (23)
and above the bed of granular solids. The distribution device being such
that at least a portion of the perimeter of the dispersive system is
provided with rims (100) or (101).