Method for olefin polymerization with recycling of co-catalyst

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 6/00 (2006.01) C08F 2/00 (2006.01) C08F 4/02 (2006.01) C08F 4/6592 (2006.01) C08F 4/68 (2006.01)

Patent

CA 2326343

The present invention relates to a catalyst preparation process and an olefin polymerization process with the recycling of co-catalyst, particularly to a method of recycling co-catalyst for the activation of single- site pre-catalyst in the olefin polymerization. This invention, therefore, provides an olefin polymerization process that can reuse expensive co-catalyst for subsequent olefin polymerization so that the total amount of co-catalyst required can be significantly reduced. This invention provides an olefin polymerization process which comprises the steps of: a) preparing activated single-site catalysts by contacting i) supported single-site pre-catalyst with ii) an organic solvent containing co-catalysts; b) separating activated single-site catalysts of step a) from co- catalysts dissolved in an organic solvent; c) olefin polymerization using the separated single-site catalysts of step b) with one or more olefinic monomers; and d) reusing the separated co-catalysts of step b) by recycling an organic solvent containing the separated co-catalysts and contacting them with the supported single-site pre-catalysts of step a).

La présente invention se rapporte à un procédé de préparation d'un catalyseur et à un procédé de polymérisation d'oléfines avec recyclage du co-catalyseur, notamment à un procédé de recyclage d'un co-catalyseur pour l'activation d'un pré-catalyseur monosite dans la polymérisation d'oléfines. Cette invention concerne par conséquent un procédé de polymérisation d'oléfines qui permet la réutilisation d'un co-catalyseur onéreux dans une polymérisation ultérieure d'oléfines, et se traduit ainsi par une réduction significative de la quantité totale de co-catalyseur nécessaire. Cette invention concerne un procédé de polymérisation d'oléfines qui consiste a) à préparer des catalyseurs monosite en mettant en contact i) un pré-catalyseur monosite supporté avec ii) un solvant organique contenant des co-catalyseurs; à séparer les catalyseurs monosite activés de l'étape a) des co-catalyseurs dissous dans un solvant organique; c) à polymériser les oléfines à l'aide des catalyseurs monosite séparés de l'étape b) en recyclant un solvant organique contenant les co-catalyseurs séparés et en les mettant en contact avec les pré-catalyseurs monosite supportés de l'étape a).

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