| abstract |
The invention relates to a process for the polymerization of olefins in the gas phase carried out in a reactor having two polymerization zones interconnected, a first zone (riser) and a second zone (chute), in which the particles of polymer being grown: a) flows through the riser under fast fluidization conditions established by providing a mixture of gas and liquid; (b) leave the riser and enter the chute, through which they flow downwards in a densified form; c) leave the chute and are reintroduced into the riser, thereby establishing a polymer flow between the riser and the chute; said reactor operating at a temperature which is between 0 ° C and 5 ° C above the dew point of the riser gas at the operating pressure, so that in the riser, in addition to the polymer particles in progress growth and the flow of gas, a quantity of liquid is also present. |