A kind of method that adopts microreactor to prepare alkyl aluminoxane

Abstract

The invention discloses a method for preparing alkyl aluminoxane by using a microreactor. The continuous flow chemical reaction system includes a fluid delivery section, a microdisperser section, a microreactor section, and a collection and purification section. On the one hand, the dispersion size of water in the inert continuous phase is reduced through the microdisperser, the contact mode between the reactants is changed in the form of micro droplets, and it is fed into the continuous stirring reactor through multi-stage feeding to prevent excessive hydrolysis. Thereby reducing or avoiding the generation of solid by-products. On the other hand, the method uses a miniature continuous stirred reactor instead of a traditional microchannel reactor, reducing the risk of pipeline blockage. Aluminum alkyls and water react in a nearly equimolar ratio in a continuous stirred reactor to produce alkylaluminoxanes. The invention is simple and feasible, the reaction process is safe and controllable, the high-efficiency heat transfer and mass transfer characteristics ensure good heat removal and reaction performance, effectively reduce the excessive reaction and incomplete reaction, and the target product reaches a high yield and active.

Description

technical field [0001] The present invention relates to the preparation of alkyl aluminoxane, in particular to a method for continuously preparing alkyl aluminoxane through microreactor technology. Background technique [0002] Alkyl aluminoxane is an important cocatalyst in olefin polymerization catalysts, which assists metallocene catalysts or late transition metal catalysts to form catalytic active centers, and obtains homopolymerization and copolymerization materials with various special structures and properties. Alkyl aluminoxane is a low molecular weight oligomer obtained by partial hydrolysis of alkyl aluminum. This reaction is a fast and strong exothermic reaction. The reaction materials involved are flammable and explosive, and are extremely dangerous. The control and Synthesizers place extremely high demands. At present, the synthesis process of alkylaluminoxane is complex and the product is expensive. Therefore, the development of an efficient, safe and controll...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of safety controllability and partial excessive hydrolysis in the existing preparation technology of alkyl aluminoxane, the present invention provides a continuous synthesis method of alkyl aluminoxane based on direct hydrolysis process and adopting micro-reactor technology, The method can realize effective microdispersion of water in an inert solvent, and effectively avoid the influence of potential solid by-products while realizing partial hydrolysis of alkylaluminum. The entire reaction process is efficient, safe and controllable. The microreactor includes a microdisperser And miniature continuous stirring reactor, described method comprises the steps:

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