Start-up polymerization process

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 2/34 (2006.01) B01J 8/24 (2006.01) C08F 4/24 (2006.01) C08F 10/00 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2315030

The present invention relates to a process for starting up a reaciton for the polymerization of an olefin in the gas phase carried out using a catalyst based on chromium oxide in a fluidized bed reactor through which moves a reaction gas mixture containing the olefin, characterized in that in the start- up of the reaction the olefin is introduced into the reactor until the desired production of polymer is reached by means of a two-stage process, during the first stage of which the introduction of the olefin is carried out so as to maintain a constant partial pressure of olefin inthe reactor and during the second stage, the introduction of olefin is regulated at a constant flow rate.

La présente invention concerne un procédé de mise en route d'une réaction de polymérisation d'une oléfine, en phase gazeuse, consistant à utiliser un catalyseur à base d'oxyde de chrome, dans un réacteur à lit fluidisé à travers lequel circule un mélange gazeux de réaction contenant l'oléfine. Ce procédé est caractérisé en ce que, lors de la mise en route de la réaction, l'oléfine est introduite dans le réacteur jusqu'à l'obtention de la production voulue de polymère, au moyen d'un processus en deux étapes, la première étape consistant à introduire l'oléfine de façon à maintenir une pression partielle constante de l'oléfine dans le réacteur, et la seconde consistant à réguler cette introduction de façon à obtenir un débit constant.

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