1. The reactor is mainly composed of the kettle body and the transmission device: the lower end of the reactor body is made of all graphite material, the kettle cover is a disc-shaped head, lined with PTFE material, and the transmission shaft and mechanical seal part are made of steel lined PTFE material to ensure the corrosion of materials to the kettle body. The kettle cover is provided with nozzles of different diameters, such as distillation port, feed port and sight glass. The PTFE coated gasket is installed between the kettle body and the kettle cover, which is sealed into a whole through the main bolts and nuts. 2. The jacket is heated by steam. Steam is introduced into the jacket to transfer the heat of steam into the kettle, so that the materials in the kettle absorb heat for reaction.