Polymerization process

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 2/34 (2006.01) B01J 8/18 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2360021

A continuous process for the manufacture of olefin polymers in a continuous gas phase polymerization reaction wherein monomer, after passage through the fluidized bed, is cooled to a temperature below its dew point to produce a mixture of cold gas and liquid. All or part of the cold gas is introduced into the bottom of the reactor to serve as the fluidizing gas stream for the fluidized bed. Cold liquid separated from the mixture is warmed to form a heated fluid by passing in indirect heat exchange relation with the fluidized bed and the heated fluid is then injected directly into the bed; combined with the fluidizing gas stream; sprayed on top of the bed or combined with gaseous monomer removed from the fluidized bed for cooling.

La présente invention concerne un processus continu de préparation de polymères oléfiniques au cours d'une réaction continue de polymérisation à phase gazeuse, dans laquelle un monomère, après son passage par un lit fluidisé, est refroidi jusqu'à à une température inférieure à sa température du point de rosée, en vue de produire un mélange de gaz froid et de liquide. Tout ou partie du gaz froid est introduit dans la base du réacteur pour servir de courant gazeux de fluidisation pour le lit fluidisé. Le liquide froid séparé du mélange est chauffé pour former un fluide chauffé en passant par relation d'échange indirecte avec le lit fluidisé. Le fluide chauffé est ensuite directement injecté dans le lit, puis associé au courant de gaz de fluidisation, et enfin, vaporisé sur la surface du lit ou associé à un monomère gazeux extrait du lit fluidisé pour être refroidi.

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