A kind of solid catalyst component and catalyst for olefin polymerization

Abstract

The present invention provides a solid catalyst component and catalyst for olefin polymerization, which contain Mg, Ti, halogen, and optionally electron donors, the C value of the solid catalyst component particle is ≥ 0.7, wherein the C value is the average sphericity. The solid catalyst component and catalyst have a preferred particle shape, and the resulting polymer product has good fluidity, high bulk density, no stickiness, less fine powder and lumps, good polymerization production stability, and high production capacity per unit volume of the reactor. features.

Description

technical field [0001] The invention relates to an olefin polymerization catalyst component, a catalyst and applications thereof, in particular to a solid catalyst component and a catalyst for olefin polymerization, and belongs to the field of polyolefin catalysts. Background technique [0002] The production process of polypropylene mainly includes five categories: solution method, slurry method, bulk method, gas phase method and bulk-gas phase combined process. The gas-phase polypropylene production process is favored because of its simple process flow, simple operation, good production flexibility, large single-line production capacity, high safety, and low equipment investment. Gas phase reactors can be divided into stirred bed and fluidized bed according to the state of motion of the solids. The range of movement of the solids in the stirred bed is small, in the form of fretting, and the packing density of the particles is high, so that a large amount of polyolefin pro...

AI Technical Summary

Problems solved by technology

[0005] However, for many existing polymerization units, adding a new pre-polymerization unit means adding new investment and relatively large modifications, and the pre-polymerization also has some limitations. The pre-polymerization reaction is carried out under low temperature conditions by controlling the catalyst and propylene The initial reaction to improve the activity of the catalyst and reduce the generation of fine powder during the polymerization reaction, which is also the difficulty of the process control of this technology

Due to the high initial activity of the catalyst, once the process is not properly controlled, it is easy to cause agglomeration in the prepolymerization reactor. When the agglomeration blocks the discharge line, the pressure of the prepolymerization reactor will increase, and in severe cases, the prepolymerization reactor will be triggered. Chain parking, resulting in the overall shutdown of the polypropylene plant

When the pre-polymerization is not properly controlled, it is easy to cause material back-mixing, which affects the stability of the polymerization.

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