Patent ID: 6056927
Filing Date: 2000-05-02
Classification: B01J,C08F

Abstract:
Apparatus for the gas-phase polymerization of olefin(s), comprising a reactor having a vertical side wall, a fluidization grid located in said reactor and defining a fluidized bed region is said reactor above said fluidization grid, said side wall of the reactor having a height H above the fluidization grid, a conduit for external circulation of a reaction gas mixture connecting a top of the reactor to a base of the reactor below the fluidization grid, said conduit including a compressor and at least one heat exchanger, at least one withdrawal conduit for withdrawing polymer from the reactor having an isolation valve and at least one emptying conduit for emptying polymer from the reactor having an isolation valve, said withdrawal and emptying conduits connecting the side wall of the reactor to a single recovery gas lock having a discharge valve, wherein said at least one withdrawal conduit leaves the side wall of the reactor at a level of the side wall, above the fluidization grid, of from 0.60.times.H to 0.95.times.H while being directed downwards, with every part of the said withdrawal conduit forming with a horizontal plane an angle A of from 35 to 90.degree. and said at least one emptying conduit leaves the side wall of the reactor at a level of the side wall, above the fluidization grid, of from 0.01.times.H to 0.20.times.H, said level where the emptying conduit leaves the side wall of the reactor being located below its point of entry into the recover gas lock.