Process for polymerizing monomers in fluidized beds

摘要

The present invention relates to a gas fluidized bed polymerization process comprising passing a gaseous stream comprising olefin-type monomer through a fluidized bed reactor in the presence of a catalyst under reactive conditions to produce polymeric product and a stream comprising unreacted monomer gases, compressing and cooling said stream, mixing said stream with feed components and returning a gas and liquid phase to said reactor. The process further comprises cooling said stream such that the liquid phase is greater than 15 % by weight of the total weight of the returned stream and the stream composition is such that the ratio of fluidized bulk density to settled bulk density is over 0.59.