Gas-phase process and apparatus for the polymerization of...

B - Operations – Transporting – 01 – J

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B01J 3/00 (2006.01) B01J 8/00 (2006.01) C08F 6/26 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2634825

A gas-phase process for polymerizing one or more .alpha.-olefins in a fluidized bed reactor in the presence of a polymerization catalyst, said fluidized bed reactor being equipped with a fluidization grid arranged at its base, and external means for recycling and cooling the unreacted gas from the top of said reactor to said fluidization grid, the process being characterized by: (i) a continuous pneumatic recycle of polymer by means of a circulation loop connecting said fluidization grid to the upper region of the fluidized bed reactor; (ii) a continuous discharge of polymer from a zone of said circulation loop having a polymer concentration higher than the polymer concentration inside the fluidized polymer bed.

L~invention concerne un procédé en phase gazeuse pour la polymérisation d~une ou de plusieurs .alpha.-oléfines dans un réacteur en lit fluidisé en présence d~un catalyseur de polymérisation, ledit réacteur en lit fluidisé étant muni d~une grille de fluidisation disposée à sa base et de moyens externes pour le recyclage et le refroidissement du gaz non réagi allant du sommet dudit réacteur vers la grille de fluidisation, ledit procédé étant caractérisé par : (i) un recyclage pneumatique en continu du polymère au moyen d~une boucle de circulation connectant ladite grille de fluidisation à la partie supérieure du réacteur en lit fluidisé ; (ii) une décharge en continu du polymère à partir d~une zone de ladite boucle de circulation présentant une concentration en polymère supérieure à la concentration en polymère dans le lit de polymère fluidisé.

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