The utility model relates to a petrochemical field discloses a carborundum bed reactor, is equipped with the sour circulating pipe (4) of liquid, raw material feed port (5) on the reactor casing respectively, mouthful (6) are taken out to the gaseous phase and mouthful (7) are taken out to the liquid phase, from last to setting up microchannel powder size and broken foam separation component (3) down in proper order perpendicularly in the casing, the casing top is arranged in raw material feed port (5), sour circulating pipe (4) the upper portion port of liquid communicates with each other with the casing inner chamber through the sour feed inlet of liquid at casing top, the gaseous phase is taken mouthful (6) out and is located microchannel powder size lower part. The utility model discloses use isobutane and alkene as the raw materials to liquid is sour for the catalyst, carries out alkylation reaction and obtains target product alkylate. The utility model discloses effectively solved alkylation reaction ware temperature nonuniform distribution's problem, had that the raw materials distributes, the temperature is easily controlled, characteristics such as product quality height.