Process for making aluminoxanes

C - Chemistry – Metallurgy – 07 – F

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C07F 5/06 (2006.01)

Patent

CA 2252365

Water, hydrocarbylaluminum (e.g., trimethylaluminum), and organic solvent (e.g., toluene) are fed to a reactor in controlled proportions and under temperature control to form a dilute reaction product mixture of specified composition and concentration. This solution is then processed so as to form at least two product mixtures, one of which is essentially aluminoxane-free hydrocarbylaluminum dissolved in organic solvent, and another of which is a concentrated solution of organoaluminum compounds composed in essence of hydrocarbylaluminum and hydrocarbylaluminoxane in organic solvent in which the amount aluminoxane far exceeds the amount of hydrocarbylaluminum. It is advantageous to add the water to a solvent solution of a hydrocarbylaluminum compound and/or an aluminoxane by feeding the water through an orifice which is surrounded by a flow of solvent which carries the water into the solvent solution of hydrocarbylaluminum compound and/or aluminoxane.

On alimente un réacteur avec de l'eau, de l'hydrocarbylaluminium (par exemple, du triméthylaluminium) et un solvant organique (par exemple, du toluène), en proportions régulées et à une température régulée, de façon à former un mélange de produits de réaction dilués, de composition et de concentration spécifiées. On traite ensuite cette solution de manière à former deux mélanges de produits, dont un est principalement constitué d'hydrocarbylaluminium ne contenant pratiquement pas d'aluminoxane dissous dans le solvant organique, et dont l'autre est une solution concentrée de composés d'organoaluminium constitués principalement d'hydrocarbylaluminium et d'hydrocarbylaluminoxane dans un solvant organique, dans laquelle la quantité d'aluminoxane est bien supérieure à la quantité d'hydrocarbylaluminium. On peut avantageusement ajouter de l'eau à une solution dissolvante constituée d'un composé hydrocarbylaluminium et/ou d'un aluminoxane en amenant de l'eau par l'intermédiaire d'un orifice qui est entouré par un flux de solvant qui transporte l'eau dans la solution dissolvante constituée d'hydrocarbylaluminium et/ou d'aluminoxane.

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