Quench box for a multi-bed, mixed-phase cocurrent downflow fixed-bed reactor

A quench box for a multi-bed, mixed-phase cocurrent downflow fixed-bed reactor, comprising:

• a quench pipe manifold and nozzle assembly;
• a collection tray having a manway and located below the quench pipe manifold and nozzle assembly for receiving fluid from a catalyst bed above the collection tray;
• a final distributor tray for distributing fluid to a catalyst bed below the distributor tray, said distributor tray having a manway;
• and
• a mixing chamber located between the collection tray and the final distribution tray and in fluid communication with the collection tray to receive a two-phase fluid stream flowing therefrom, said mixing chamber including:
• an annular compartment depending from the collection tray above and having a partition pan and a bottom section pan,
• said partition pan having a partition weir at its inside diameter over which liquid flows onto the bottom section pan, and
• said bottom section pan having a vapor outlet weir at its inside diameter, which inside diameter is less than the inside diameter of the partition weir, for vapor flow onto the final distributor tray below and having drip tubes extending to the final distributor tray below, said drip tubes having top slots and bottom slots for directing liquid flow onto said final distributor tray.