Patent ID: 7781544
Filing Date: 2010-08-24
Classification: B01J,B04C,C08F

Abstract:
1. An apparatus for the polymerization of olefins comprising a gas-phase fluidized-bed reactor ( 1 ), a recycle gas line ( 2 ) connected to the reactor for discharging and recirculating recycle gas comprising solid particles and unpolymerized olefins, and a cyclone ( 3 ) located in the recycle gas line for the reduction and precipitation of the solid particles entrained in the recycle gas from the reactor, with the cyclone comprising: an upper section ( a middle section ( a lower section ( a tube ( wherein a ratio H i , equal to h i /d i , has a value from 4.5 to 6.5, h i being the distance from the lower end of the tube ( 5 ) extending downward into the cyclone to an intersection ( 6 ) of an imaginary extension of the wall of the downward-extending tube ( 5 ) with the wall of the middle section ( 3 b ), and d i being the diameter of the downward-extending tube ( 5 ).