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

The partially condensed fluid recycle stream of a fluidized be polyolefin reactor operating in the condensing mode is split into two portions by a stream splitter. In a preferred mode, the smaller stream from the splitter contains a higher ration of liquid gas than the larger stream. One portion o f the split stream is injected below the fluidized bed and the other, preferab ly with enhanced liquid content, is injected into the fluidized bed at a level above the product withdrawal level. Regulation of liquid injection above the product withdrawal level, as a function of liquid in the product discharge tanks, reduces the liquid in the product discharge system, resulting in improved discharge cycle times and more efficient conservation of monomer an d other materials which might otherwise be lost in the discharge process.