Device for distributing feed and recovering effluents in a radial bed catalytic reactor

A radial bed catalytic conversion unit having an outer cylindrical chamber (1) and an inner chamber (2) which is also cylindrical, the annular zone included between the outer chamber and the inner chamber, termed the reaction zone (I), being fillable with catalyst under slow gravitational flow, and the feed being introduceable via an inlet pipe (E), connected to an intermediate box (F) which is in turn connected to a plurality of distribution tubes (3) disposed inside the reaction zone (I) in the vicinity of the outer chamber (1), said distribution tubes (3) being substantially vertical and extending substantially over the entire height of said reaction zone (I), the reaction effluents being collectable in a central collector (II) defined by the inner chamber (2), and the catalyst being introduceable into an upper portion of the reaction zone (I) comprising a plurality of introduction legs (4) located in the upper portion of the reaction zone (I), and the catalyst being withdrawable via a plurality of withdrawal legs (6) located in the lower portion of the reaction zone (I).