Alkylation multi-stage reactor and alkylation reaction method

The invention discloses an alkylation multistage reactor and an alkylation reaction method, and relates to the technical field of alkylation reaction. The device comprises a reaction tank, a top cover and a feeding pipe, the top cover is embedded in the upper surface of the reaction tank, the top cover is movably connected with the reaction tank, the feeding pipe is embedded in the upper surface of the top cover, one end of the feeding pipe is communicated with the interior of the reaction tank, an alkylation reactor is embedded in the reaction tank, and the other end of the feeding pipe is communicated with the interior of the reaction tank. A quantitative feeding bin is embedded in the other end of the feeding pipe, and a feeding valve is embedded in the circumferential side face of the feeding pipe. The alkylation reaction is carried out under the centrifugal force field flash evaporation condition, compared with a conventional liquid-liquid reaction system in which acid undertakes heat conduction and flas