Fluidized bed reactor and system device for preparing isophthalonitrile

The invention relates to a fluidized bed reactor and a system device for preparing isophthalonitrile. The fluidized bed reactor comprises a heat exchange component, a separator and a distributor, the heat exchange component comprises a first-stage heat exchange piece arranged in a dense-phase region of the fluidized bed reactor and a second-stage heat exchange piece arranged between the dense-phase region and a dilute-phase region of the fluidized bed reactor; the distributor comprises a first-stage distributor, a second-stage distributor and a third-stage distributor which are sequentially arranged from top to bottom; and the first-stage heat exchange piece is arranged above the first-stage distributor. The novel heat exchange component is arranged and matched with the multi-stage distributor, so that the amount of amide generated by reaction is effectively controlled, and meanwhile, the selectivity of isophthalonitrile is improved. Therefore, the reactor operates stably, and a good technical effect is achie