Device for distributing a polyphase mixture in a chamber containing a fluidized medium

A distribution device for distributing a light fluid phase (2) within a heavy phase (4) in a reaction chamber (5) containing said heavy phase (4), the device comprising:

• a pipe (1) for transporting the light fluid phase (2) to the reaction chamber (5);
• first windows (7) and second windows (8) in a lateral wall of the pipe (1), the second windows (8) opening directly into the reaction chamber (5);
• and
• branches (6) extending each first window (7) in a branch axis (x) that is essentially perpendicular to the axis of symmetry (z) of the pipe (1), in which each branch (6) splits, in a plane (xy) essentially orthogonal to the axis of symmetry (z) of the pipe (1), into:
• a central passage opening into the reaction chamber (5) via an intermediate window (9) in an upper wall of the branch (6);
• and
• at least two distinct lateral branches forming two lateral passages (10) opening into the reaction chamber (5) via end-of-branch windows (11).