Patent ID: 6680032
Filing Date: 2004-01-20
Classification: B01J

Abstract:
An apparatus for the continuous preparation of granules, said apparatus comprising:a) a fluidized-bed vessel; b) means for introducing granule starting material consisting of granule-forming liquid into said vessel, said means comprising spraying means, said spraying means comprising a two-material nozzle for spraying two different materials into said vessel, the nozzle being located level with the fluidized bed, and there being a distance between a top end of the nozzle and a bottom of the vessel; c) a fluidizing means for dispersing the liquid and building the fluidized bed, the fluidizing means supplying atomizing gas in such a way that no environmental air penetrates into the vessel and no granules escape from the apparatus; d) a means for returning to the bottom end of said vessel adjacent to and above the spraying means fine granules that escape from said vessel adjacent the top of said vessel; e) at least one countercurrent gravity zig-zag classifier of adjustable cross section at an outflow bottom of said vessel, said classifier being the only means of classifying grain size in said apparatus; and f) an adjusting means for varying the cross section of the classifier, said adjusting means being connected to a regulating device which regulates a classifying gas stream by way of a valve in such a way that a flow velocity in the classifier remains constant.