Apparatus for degassing and pelleting polyolefins

Details Apparatus for degassing and pelleting polyolefins Apparatus for degassing and pelleting polyolefins

B - Operations, Transporting

29

B

18/768, 259/43.4

B29B 9/06 (2006.01) B01D 19/00 (2006.01) B29B 7/84 (2006.01) C08F 6/00 (2006.01) C08F 6/26 (2006.01)

Patent

CA 1287463

ABSTRACT OF THE DISCLOSURE APPARATUS FOR DEGASSING AND PELLETING POLYOLEFINS The invention relates to a process and a device for degassing and converting into pellets polyolefins from a gas-phase reactor. A device according to the invention comprises, in combination (fig 1): - a reactor (1) for the catalytic polymerisation in the gas phase of alpha-olefins, equipped with a polyolefin outlet (9); - A device (12) for primary degassing by separation of the solid and gas phases, connected to the said outlet; - A device for secondary degassing (14) to substantially free the particles of the gases accompanying them and which is connected to the outlet of the primary degassing (12) and which comprises a mechanical stirrer (14a) making it possible to raise the temperature of the particles to a temperature close to the minimum sintering temperature by conversion of the mechanical energy into heat; - and a device (15) for pelleting the particles by extrusion through a die, this device being connected to the outlet of the said secondary degassing device.

536363

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