The utility model relates to a
reflux reaction kettle which comprises a kettle body, a stirring mechanism is arranged in the kettle body, a heating layer is arranged on the outer side of the kettle body, a
reflux assembly is arranged on the kettle body and comprises an
evaporation pipe, a
reflux pipe and a cooling box, the cooling box is arranged on the upper side of the kettle body, and the cooling box is connected with the kettle body through the
evaporation pipe and the reflux pipe. A
cooling pipe is arranged in the cooling box, two ends of the
cooling pipe are connected with the outer side cooler, a guide plate is arranged on the upper side of the
cooling pipe in the cooling box, a condensation sheet group is arranged in the cooling box, and a
tail gas treatment mechanism is arranged on the upper side of the cooling box; after materials are put into the kettle body, the stirring mechanism stirs the materials, the heating mechanism heats the materials, when the materials are heated till
backflow occurs, material steam is conveyed to the cooling box through the
evaporation pipe and is cooled through the cooling pipe, part of the material steam is condensed and flows back, the rest of the material steam is guided by the guide plate, condensed by the condensation piece set and then flows back, and liquid after
backflow is conveyed back to the kettle body through the
backflow pipe. The device has the effects of sufficient condensation and backflow and relatively good backflow.