Polymerisation process

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 2/34 (2006.01) B01J 8/18 (2006.01) B01J 8/24 (2006.01) B01J 19/26 (2006.01) B05B 7/04 (2006.01) B05B 7/08 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2161432

The invention relates to continuous gas fluidised bod polymerisation of olefins, especially ethylene, propylene, or mixtures of these with other alpha olefins, wherein the monomer-containing recycle gas employed to fluidise the bed is cooled to condense out at least same ~ liquid hydrocarbon. The condensed liquid, which can be a monomer or an inert liquid, is separated from the recycle gas and is fed directly to the bed to produced cooling by latent heat of evaporation. The liquid feeding to the bed can be through gas-induced atomiser nozzles (fig. 2), or through liquid-only nozzles. The process provides substantially improved productivity of gas fluidised bed polymerisation of olefins.

L'invention concerne la polymérisation en continu en lit fluidifié gazeux d'oléfines, particulièrement éthylène, propylène ou leurs mélanges avec d'autres alpha -oléfines, où le gaz de recyclage contenant un monomère utilisé pour fluidifier le lit est refroidi, afin de condenser au moins une quantité partielle d'hydrocarbure liquide. Le liquide condensé, qui peut être un monomère ou un liquide inerte, est séparé du gaz de recyclage et introduit directement dans le lit, afin d'effectuer un refroidissement par chaleur d'évaporation latente. L'alimentation du lit en liquide peut s'effectuer à travers des buses de pulvérisation à induction gazeuse (fig. 2) ou à travers des buses à liquide uniquement. Le procédé permet d'améliorer sensiblement la productivité de polymérisation d'oléfines en lit fluidifié gazeux.

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