Process to increase melamine yield and to improve dust separation in the melamine production from urea in fluidized-bed catalytic processes. - Process to increase melamine yield and to improve dust separation in the melamine production from urea in fluidized-bed catalytic processes comprises: transferring the process gas (containing melamine, non-converted isocyanic acid, melam, melem and other higher molecular nitrogen compounds) of the fluid-bed reactor into a filter-reactor (consisting of one or more ring-reactors filled with catalysts) to convert isocyanic acid to melamine; and reconverting higher molecular nitrogen compounds (especially melam and melem) to melamine by reaction with ammonia in the process gas (where the catalyst fines present in the process gas are removed). |