Process for polymerising olefin in gas phase

Details Process for polymerising olefin in gas phase Process for polymerising olefin in gas phase

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) C08F 10/00 (2006.01)

Patent

CA 2170101

The present invention relates to a process for continuous gas-phase polymerization of olefin(s) in a fluidized and/or mechanically stirred bed reactor, comprising a stage of drawing off the polymer out of the reactor, wherein a portion of the bed is transferred into a lock hopper and is then isolated from the reactor in the lock hopper for a period of 5 to 120 seconds so that a substantial amount of the olefin(s) in the said portion polymerizes, before the polymer thus isolated in the said portion is discharged out of the lock hopper. The process advantageously reduces the amount of the gas drawn off with the polymer to be recycled into thereactor and improves the degassing of the polymer by the heat of the polymerization reaction during the isolation period in the lock hopper.

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