Method for preparing alkoxyl magnesium solid particles

Abstract

The invention provides a method for preparing spherical alkoxyl magnesium particles with excellent properties. In the method, magnesium, alcohol and a halogenating agent are reacted at a reflux temperature, so that the alkoxyl magnesium particles are obtained. The alkoxyl magnesium particles have the advantages of higher bulk density, good particle shape and particular suitability for serving as a catalyst carrier of an olefin polymerization reaction.

Description

technical field [0001] The invention relates to a preparation method of alkoxymagnesium solid particles, more specifically, to a spherical alkoxymagnesium solid particle with a high bulk density and an average particle diameter of 10-80 μM, which can be used to prepare olefin polymerization catalysts The preparation method and the spherical alkoxymagnesium particles obtained by the preparation method. Background technique [0002] As we all know, olefin polymers are usually obtained by polymerization under the catalysis of Ziegler-Natta catalysts composed of titanium compounds and organoaluminum compounds. For example, in the preparation process of polypropylene, generally, the catalyst uses a solid catalyst component composed of magnesium, titanium, halogen and an electron donor compound as the main catalyst component, an organoaluminum compound as the auxiliary catalyst component and as a stereoregularity The enhancer contains organosilicon compounds with alkoxy groups as...

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Problems solved by technology

For example: in the first method, the shape of the particles is crushed and destroyed. If you want to obtain particles with complete surface morphology and particle size distribution, you have to pay a lower output rate, so it is difficult to apply to industrial production.

In Method 2, although the range of the final magnesium / ethanol addition ratio is specified as 9 / 1-1 / 15, it is found through research that if sufficient stirring is not carried out in the second half of the reaction, particles will occur. Agglomeration, uniform round particles cannot be obtained; if forced to stir, the shape of the particles will be destroyed

[0005] In methods 3 to 5, in addition to Mg and ROH, other raw materials are needed, and the preparation process is also very complicated. At the same time, it cannot fully meet the requirements for the preparation of high-performance olefins in terms of particle shape and particle diameter. Catalyst requirements

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