Process for treating gas flows of polyolefin manufacturing

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 2/34 (2006.01) B01D 53/22 (2006.01) C08F 6/00 (2006.01) C08F 6/10 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2322447

The invention relates to a process for the treatment of a gas stream obtained from the production of polyolefins and containing unreacted compounds. According to the process, uncondensed compounds are removed from the gas stream and, when so desired, these compounds are directed to further treatment. According to the invention, the uncondensed compounds are separated from the gas stream by membrane separation. Thus the separation of gases is facilitated, since by coupling the membrane system in conjunction with distillation columns the distillation can be carried out at a substantially higher top temperature. By using the membrane system it is possible effectively to remove the lightest gases, which would otherwise accumulate in the process.

L'invention concerne un procédé de traitement d'un flux gazeux issu de la production de polyoléfines et renfermant des composés n'ayant pas réagi. Selon ce procédé, des composés non condensés sont éliminés du flux gazeux et, si on le souhaite, envoyés vers un traitement ultérieur. Selon l'invention, les composés non condensés sont séparés du flux gazeux par séparation par membrane. Ainsi, la séparation des gaz est facilitée, puisqu'en associant par accouplement le système de membrane à des colonnes de distillation, la distillation peut se faire à une température supérieure sensiblement plus élevée. Ce système de membrane permet d'éliminer efficacement les gaz les plus légers, qui sinon s'accumuleraient lors du processus.

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