The invention relates to the technical field of
fluorine chemical engineering and specifically relates to a use method of a circulating
fluidized bed rectification device for preparing
hydrogen fluoride. The use method is characterized by comprising the steps that a coarse
hydrofluoric acid solution enters from a liquid material guiding
pipe which is arranged in the middle of a circulating
fluidized bed rectification
tower, the coarse
hydrofluoric acid solution is injected into a liquid receiving disk, the coarse
hydrofluoric acid solution is evenly distributed by the liquid receiving disk anddrops into a
reboiler, the coarse hydrofluoric acid solution is gasified to form rising steam when flowing downwards to various stages of fin plates, the coarse hydrofluoric acid solution passes through the liquid receiving disk to enter a multistage
cyclone condenser, liquid drops carried by the rising steam can be
cyclone separated to form a continuous liquid film on a
barrel body wall of the multistage
cyclone condenser, in this case, the content of a volatile component
hydrogen fluoride in the rising steam is continuously improved, the purity of the
hydrogen fluoride liquid condensed by the multistage cyclone condenser is continuously improved, and the
hydrogen fluoride liquid is drained out from the bottom.