Catalytic hydrocarbon dehydrogenation system with prereaction

摘要

The performance of an endothermic catalytic dehydrogenation process is increased without requiring additional catalyst regeneration and reheat air flow and compression by partially prereacting the preheated hydrocarbon feed and then reheating the partially dehydrogenated effluent from the prereactor to the same hydrocarbon preheat temperature prior to the main catalytic reactor. The preferable source of the heat for reheating is the effluent air from the reheat and regeneration of the catalyst in the main reactor. This same effluent air is used to regenerate the catalyst in the prereactor as needed.