▎ 摘　　要

NOVELTY - Device comprises e.g. a frame, a tail gas absorbing device is installed on the frame in turn, stirring device, a waste liquid collecting tank, ultrasonic treatment device and the decompression distilling device, where the tail gas absorption device includes a tail gas processing tank, upper side of the tail gas processing tank are respectively connected with an air inlet pipe, exhaust gas processing tube and the tail gas reflowing pipe. The tail gas processing pipe is connected with a tail gas discharging pipe and tail gas reflowing pipe is connected with a tail gas discharging pipe. USE - The device is useful for preparing graphene (claimed). ADVANTAGE - The device has high preparation efficacy, meets large-scale needs, produces large-area, high-purity graphene, meets the large-scale demand in the field of energy storage materials and functional composition materials, has low production cost, achieves the less waste water and environmentally-friendly. The process is simple, produces the high unit yield and easy industrialization. DETAILED DESCRIPTION - Device comprises a frame (1), a tail gas absorbing device (2) is installed on the frame in turn, stirring device (3), a waste liquid collecting tank (4), ultrasonic treatment device (5) and the decompression distilling device, where the tail gas absorption device comprises a tail gas processing tank, upper side of the tail gas processing tank are respectively connected with an air inlet pipe, exhaust gas processing tube and the tail gas reflowing pipe. The tail gas processing pipe is connected with a tail gas discharging pipe. The tail gas reflowing pipe is connected with a tail gas discharging pipe. The tail gas processing tank at the lower side is connected with the waste liquid discharging pipe. The waste liquid discharging pipe is connected with a tail gas discharging pipe. The waste liquid discharging pipe is connected with the discharging pump. The stirring device comprises a reaction kettle. The upper side of the reaction kettle is connected through a first connecting pipe is connected with an air inlet pipe. The upper side of the reaction kettle is provided with a first motor. The output shaft of the first motor is connected with the first stirring rod, a first stirring rod is set in the reaction kettle, at least is connected with a waste liquid collecting tank by a first connecting pipe at the lower side of the reaction kettle is provided with a drain pipe at the lower side of each waste liquid collecting tank and the ultrasonic treatment device comprises a kettle body. The ultrasonic instrument is set in the kettle body, kettle body through a second connecting pipe connected with the reaction kettle and the lower side of the kettle body through the third connection pipe is connected with the decompression distilling device the decompression distilling device comprises a pressure reducing tank. The pressure tank is connected with the third connecting pipe which is provided with a second motor on the decompression tank. The output shaft of the second motor is connected with the second stirring rod. The second stirring rod is set in the decompression tank, a vacuum extracting tank through the fourth connecting pipe is connected with the distilling bottle, where processing the graphene by (i) adding sulfuric acid in the reaction kettle by the first stirring rod, stirring and cooling, cooling to 100C-150 degrees C; (ii) adding potassium permanganate in the reactor, stirring and cooling through the first stirring rod (17), where the reaction temperature is less than 200 degrees C; (iii) heating by the heat released by the reaction at 300-350 degrees C; (iv) adding graphite, where the reaction temperature is controlled to 330C-370 degrees C; (v) filtering through centrifuge to obtain primary graphene; (vi) cleaning, successively adding hydrogen peroxide and clear water in the centrifuge to wash to obtain the second graphene; (vii) shearing the second graphene and shearing into the desired size through the shearing machine to obtain the third grade graphene; (viii) processing by ultrasonic, where three levels of graphene by the ultrasonic treatment device by performing ultrasonic treatment to obtain graphene in four stages; (ix) vacuum extracting and distilling, where four levels of graphene through the vacuum extraction distilling device to obtain the four-grade graphene; and (x) centrifuging by a centrifuge to obtain the final graphene product. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of device. Frame (1) Tail gas absorbing device (2) Stirring device (3) Waste liquid collecting tank (4) Ultrasonic treatment device (5)