C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 2/34 (2006.01) B01J 3/02 (2006.01) B01J 8/00 (2006.01) B01J 8/24 (2006.01) B01J 8/44 (2006.01) C08F 10/00 (2006.01)
Patent
CA 2170098
The present invention relates to an apparatus for gas phase polymerisation of olefins(s), essentially comprising a fluidized bed reactor and at least one conduit for drawing off polymer provided with an isolation valve and connecting the vertical side wall of the reactor to a lock hopper, the said conduit leaving thevertical side wall of the reactor while being directed downwards so that each part of the said conduit forms with a horizontal plane an angle A ranging from 35° to 90°. It also relates to a process for continuous gas-phase polymerisation of olefin(s) in a fluidized-bed reactor, comprising drawing off the polymer from the vertical side wall of the reactor into a lock hopper via a draw-off conduit so that all flow of the polymer in the draw-off conduit is produced according to a downward direction forming with a horizontal plane an inclination with an angle A at least equal to the angle of repose .beta. of the polymer and not exceeding 90°. The present invention improves the degree of filling of the lock hopper and reduces the amount of gas drawn off with the polymer.
Bp Chemicals Limited
Fetherstonhaugh & Co.
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