Process and apparatus for the gas-phase polymerization of olefins

摘要

Gas-phase process for the preparation of polymers and copolymers of olefins CH2=CHR, carried out in at least 2 fluidized or mechanically agitated bed gas-phase reactors operating under different reaction conditions so as to obtain different polymers in the different reactors; the process is characterized in that the polymer is at least partially recycled among the different reactors by using ratios of the flow rate of circulation among the different reactors to the discharge flow rate comprised between 2 and 6.