Synthesis tower of methane

The utility model discloses a methyl alcohol synthetic reactor. An axle center part in a casing cavity is provided with a center tube, and the top part of the center tube is provided with a gas outlet tube; the bottom part of the center tube is provided with a filter cartridge, the upper and the lower ends of a reaction tube bundle which is in axial arrangement in the casing are respectively fixedly sealed in corresponding inserting holes of an upper and a lower tube plates; an inner end socket of which the bottom end is provided with a discharging hole structure is fixedly sealed on the bottom surface of the lower tube plate to form a lower floating head, and expansion clearances are reserved between the peripheral edge of the lower tube plate and the inner wall of the casing and between the peripheral edge of the inner end socket and the inner wall of the casing. The methyl alcohol synthetic reactor of the utility model overcomes the temperature difference stress between the tube bundles and the casing and solves the problem that a reaction part in the casing can not be sealed at a high temperature; moreover, the utility model has convenient replacement of catalyst fillers, simple structure and low cost.