Method for producing highly reactive polyisobutenes

Details Method for producing highly reactive polyisobutenes Method for producing highly reactive polyisobutenes

C - Chemistry, Metallurgy

08

F

C08F 110/10 (2006.01) C08F 2/06 (2006.01) C08F 4/14 (2006.01) C08F 6/02 (2006.01) C08F 6/12 (2006.01) C08F 10/10 (2006.01)

Patent

CA 2389249

The invention relates to a continuous method for producing polyisobutene by polymerization of isobutene in the presence of a catalyst from boron trifluoride and at least one cocatalyst in an inert organic solvent. The inventive method comprises the steps of a) discharging, in a continuous manner, a part of the reaction mixture obtained by the polymerization from the polymerization reactor, b) removing the catalyst from the discharged material and/or deactivating it during the discharge, c) removing the solvent and non- reacted isobutene from the discharged material and returning it to the polymerization reactor. The inventive method is further characterized in that the returned solvent and optionally the isobutene are first washed with water and dried before they are returned to the polymerization reactor.

L'invention concerne un procédé pour la production continue de polyisobutène par polymérisation d'isobutène en présence d'un catalyseur constitué de trifluorure de bore et d'au moins un cocatalyseur dans un solvant organique inerte. Selon l'invention, a) on extrait en continu du réacteur de polymérisation une partie du mélange réactionnel obtenu; b) on sépare le catalyseur de l'extrait ou on le désactive dans l'extrait; c) on sépare le solvant et, éventuellement, l'isobutène non transformé de l'extrait et on les réintroduit dans le réacteur de polymérisation. Le procédé selon l'invention est caractérisé en ce que le solvant réintroduit et, éventuellement, l'isobutène sont soumis à un lavage à l'eau puis séchés avant d'être réintroduits dans le réacteur de polymérisation.

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