PROCESS USING CONDENSING MODE IN FLUIDIZED BEDS, WITH LIQUID PHASE ENRICHMENT AND BED INJECTION

Method of controlling the temperature in a fluidized bed wherein an exothermic reaction is conducted to make particulate product in a reactor containing said fluidized bed maintained by the distribution of fluid at a fluid distribution level and wherein said particulate product is withdrawn at a product withdrawal level within said fluidized bed, comprising continuously or intermittently removing from said reactor a stream of fluid, removing heat from said stream of fluid and condensing at least a portion thereof, passing said stream of fluid through a conduit segment having a first exit duct and a second exit duct to separate liquid and gas in said second exit duct from liquid and gas in said first exit duct, recycling the liquid and gas in said first exit duct to said fluid distribution level and recycling the liquid and gas in said second exit duct by a direct passage to a zone within said fluidized bed above said fluid distribution level.