Method for preparing amorphous alkoxy magnesium

Abstract

The invention provides a method for preparing amorphous spherical particle alkoxy magnesium. In the method for preparing the amorphous spherical particle alkoxy magnesium, magnesium powder and mixed alcohol are used as raw materials, halogen monomer and/or inorganic halide are/is used as a halogenating agent, an organic halogen-containing compound is used as a modifier, and one or more inertial organic solvents are used as a dispersing agent; and the obtained spherical particle alkoxy magnesium has higher stacking density, more perfect particle shape and higher particle size distribution uniformity. The alkoxy magnesium is particularly suitable to be used as an olefin polymerization catalyst carrier. The obtained catalyst has high activity, higher stacking density, good particle shape and uniform distribution and is suitable for devices for producing polypropylene by gas-phase processes.

Description

technical field [0001] The invention provides a method for preparing a carrier for an olefin polymerization catalyst, spherical particles with high bulk density and excellent particle shape, and belongs to the field of olefin polymerization. Background technique [0002] With the increasing demand for polyolefins, the requirements for olefin polymerization catalysts are also increasing, and Ziegler-Natta catalysts supported by magnesium chloride are currently the most widely used. For example, the preparation methods of catalysts disclosed in patents such as CN85100997A and CN1453298A generally consist of a solid catalyst component composed of magnesium, titanium, halogen and an electron-donating organic compound. However, it is not a catalyst that can meet the requirements of various properties, such as suitable particle size and shape, uniform particle distribution, minimization of particles, high packing density, etc., as well as high catalyst activity and stereoregularit...

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Problems solved by technology

In Method 2, although the range of the final magnesium / ethanol addition ratio is specified to be 9 / 1-1 / 15, however, according to the researcher’s discussion and test results, if the addition ratio is always fixed at 9 / 1, In the second half of the reaction, when the reaction rate of a sharp increase in viscosity exceeds 80%, if sufficient stirring is not carried out, the particles will aggregate and uniform round particles cannot be obtained; if the stirring is forced, the shape of the particles will be caused Destroyed (Charter flat 6-239521)

[0005] On the other hand, if the initial addition ratio is set at 1 / 15, so that the reaction occurs under the condition of a relatively large amount of ethanol, when the viscosity rises in the final stage of the reaction, although the stirring can be carried out smoothly, the shape of the obtained particles is not round enough. , and the capacity density is also very low, and the particles satisfying the conditions cannot be obtained

In the various methods of 3-5, other raw materials are required besides Mg and ROH, and the operation is also complicated, so it can be said that it is not suitable as a method for producing the desired fine particles

In addition, considering aspects such as shape and particle diameter, it cannot be said that it is a production method that can meet the requirements.

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