Patent ID: 9073027
Filing Date: 2015-07-07
Classification: B01J,C08F

Abstract:
1. A gas-phase polymerization reactor having interconnected polymerization zones comprising: (i) a riser through which a plurality of polymer particles flow upwards under fast fluidization conditions or transport conditions; (ii) a dowcomer through which the plurality of polymer particles flow downward in a densified form under the action of gravity, the bottom of said downcomer being connected to a lower region of said riser by means of a transport section, said transport section being designed as a bend descending from the downcomer to the riser; (iii) said reactor being further provided with a line for feeding a carrier gas at the inlet of said transport section and with a gas distribution grid extending from the inlet of said transport section for an angle α of at least 50° along the bending of said transport section, wherein the gas distribution grid contains a plurality of slits, wherein a top end of the gas distribution grid and the first slit forms an angle lower than 25°.