Circulating dehydrogenation device for extracting alkane from dealkylation tower top of mixed aromatic hydrocarbon

The present invention discloses a mixed aromatic hydrocarbon dealkylation tower top extracted alkane circulation dehydrogenation apparatus, and relates to the technical field of dehydrogenation apparatuses, the mixed aromatic hydrocarbon dealkylation tower top extracted alkane circulation dehydrogenation apparatus comprises a dehydrogenation tank body, the side end of the dehydrogenation tank body is provided with a gas inlet and a gas outlet, and the gas inlet and the gas outlet are respectively fixedly connected with a gas inlet box and a gas outlet box, waterproof breathable films are connected to the interiors of the air inlet box and the air outlet box, a stirring mechanism is arranged on the inner side of the dehydrogenation tank body, a flow guide structure is arranged at the air inlet, and the stirring mechanism rotates in the direction, away from the air outlet, of the air inlet under the action of the flow guide structure. According to the cyclic dehydrogenation device for extracting alkane from the