Method and device for preparing and purifying bis (fluorosulfonyl) imide by continuous method

The invention belongs to the technical field of preparation of chemical raw materials, and relates to a preparation device and method of sodium bis (fluorosulfonyl) imide. Comprising a bis (chlorosulfonyl) imide feed pump, a hydrogen fluoride feed pump, a feed mixer, a tubular reactor, a flash tank, a compressor, a compressor outlet condenser, a hydrogen fluoride recovery buffer tank, a recovered hydrogen fluoride delivery pump, a film evaporator feed pump, a film evaporator, a gas phase condenser, a 1 # vacuum pump, a low-boiling-point substance receiving tank and an evaporator feed liquid buffer tank, according to the present invention, the tubular continuous flow reactor is adopted, such that the reaction time is shortened, the production efficiency is improved, and the quality of the produced HFSI is stable. The tubular reactor is more uniform in heating, and side reactions such as product decomposition and polymerization caused by local overheating of the kettle type reactor are reduced. 本发明属于化工原料制备技术领域，