Being the down flow catalytic cracking reactor, it has the component below: Catalyst delivery tube (1), reactor apex cover (2), raw materials nozzle (3), reactor container (6), down flow reaction tube (9). The top of the reactor container is connected the apex cover (2) closing according to around direction; Bottom of the reactor container is connected, the external wall of the down flow reaction tube closing; The upper section of the down flow reaction tube to be located inside the reactor container, on the one hand, the lower part section from bottom of the reactor container the extension; The raw materials nozzle (3) the cover (2) and/or reactor easy (6) is located to the side wall, as for the exit of this raw materials nozzle, is an upper part of the entrance of the down flow reaction tube; The catalyst delivery tube (1) is connected, has communicated, the reactor container locking, the catalyst rise zone which is formed and by the reactor container and the down flow reaction tube (7) with. Furthermore, in addition as for this invention, use of this reactor is offered.
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