External fluid catalytic cracking unit regenerator plenum manifold

For use in a regeneration chamber of upright circular construction in which a finely divided particulate catalyst is at least partly coated with a carbon material residue from its prior use as a catalyst is accumulated and the catalyst is found in a portion of the chamber in a dilute phase mixed with flue gases, the improvement comprising

• at least two cyclone separator means in the regeneration chamber, each having an inlet means communicated with the regeneration chamber for receiving a mixture of flue gas and particulate catalyst thereinto and wherein said cyclone separator means separates the flue gas and catalyst which are discharged through separate outlet means;
• an externally located flue gas plenum on the exterior of the regeneration chamber for said cyclone separator means for collecting flue gases therefrom and communicating the flue gas to a point of disposal;
• and
• a generally vertically directed standpipe connected to each of said cyclone separator means and also connected to said plenum, said stand pipe passing through a wall of the regenerator chamber and which includes:
• an internal metal pipe;
• an insulation coating thereon;
• and,
• hanger means connected to said pipe and extending therefrom and adopted to be connected at an exterior point to a fixed structural support.