Solid catalyst component for olefin polymerization

Abstract

The present invention discloses a solid catalyst component for olefin polymerization, wherein the solid catalyst component contains Mg, Ti, a halogen and an internal electron donor, and further contains an activator, and the activator is at least one selected from a citrate compound represented by a general formula (I). The invention further discloses a catalyst containing the solid catalyst component, and applications of the catalyst in olefin polymerization reactions, particularly in propylene polymerization reactions. According to the present invention, the non-toxic citrate compound used as the activator is used in the preparation of the olefin polymerization catalyst, such that the prepared catalyst can reduce the internal electron donor consumption while maintain the high-level catalytic performance, especially the high activity, and is especially suitable for the preparation of high-tacticity polyolefins.

Description

technical field [0001] The present invention relates to a method for CH 2 =CHR Catalyst component for olefin polymerization, wherein R is hydrogen or a hydrocarbyl group containing 1-12 carbon atoms. More specifically, the present invention relates to a solid catalyst component containing a citrate compound as an activator. In addition, the present invention also relates to a catalyst containing the solid catalyst component and the application of the catalyst in olefin polymerization, especially in propylene polymerization. Background technique [0002] In the propylene polymerization industry, the most widely studied and applied catalyst is Ziegler-Natta (Z-N) catalyst, which is prepared by adding an internal electron donor during the process of loading titanium on an active magnesium chloride support. Since internal electron donors can change the performance of catalysts to the greatest extent, research and search for ideal internal electron donor compounds have become t...

AI Technical Summary

Problems solved by technology

The content of the internal electron donor is too low, the coordination improvement effect on the active center is not enough, and the activity and stereospecificity are not ideal; in order to obtain higher activity and stereospecificity, it is necessary to relatively increase the content of the internal electron donor in the catalyst

For a fixed production process, one of the direct methods to increase the content of the internal electron donor in the catalyst is to increase the amount of the internal electron donor, but the number of active centers in the catalyst is certain. For a specific internal electron donor structure, The content of effectively coordinated internal electron donors has a corresponding upper limit. If the amount of internal electron donors is increased too much, the part of internal donors that are ineffective in coordination will be lost in the subsequent washing process, which will not only fail to meet expectations effect, but also cause waste of materials

And excessively increasing the feeding amount of the internal electron donor will increase the burden of environmental pollution for the ortho-phthalic internal electron donors with carcinogenic risks. For more expensive non-adjacent electron donor catalysts, it significantly increases the production cost

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