Particulate catalyst component and preparation method and application thereof

Abstract

The invention relates to the field of olefin polymerization catalyst components, and discloses a granular catalyst component and its preparation method and application. The method comprises: (1) adding a magnesium compound, an organic epoxy compound, an organic phosphorus compound and an organic alcohol compound in a solvent Carry out the first contact to form a uniform solution; (2) in the presence of a precipitation aid, perform the second contact with the uniform solution and the titanium compound in a dropwise manner to obtain a mixture; (3) mix the mixture obtained in step (2) Carry out the third contact with the ester to obtain a solid-liquid mixture; (4) Optionally, contact the solid-liquid mixture obtained in step (3) with an internal electron donor compound to obtain the particulate catalyst component; wherein, the first The temperature of the third contact is higher than the temperature of the second contact, and the temperature is raised from the temperature of the second contact to the temperature of the third contact under the condition of standing.

Description

technical field [0001] The present invention relates to the field of olefin polymerization catalysts, in particular to a method for preparing a granular catalyst component, the granular catalyst component prepared by the method, and the performance of the granular catalyst component in olefin polymerization or copolymerization application. Background technique [0002] The currently disclosed methods for preparing solid titanium catalyst components for olefin polymerization are divided into two categories, one is supported catalyst components, that is, active components containing titanium are loaded on a carrier with a certain shape, and the main raw materials used for the carrier are generally It is magnesium chloride or silica gel, and its shape is mostly spherical, such as the methods disclosed in patents such as US4399054 and EP-B-65700; the other is a granular catalyst component, which is prepared into a uniform solution by magnesium chloride powder, and then precipita...

AI Technical Summary

Problems solved by technology

[0008] CN1258683A discloses a method for obtaining larger particles by increasing the addition of solvent toluene in the magnesium chloride dissolution system, and mentions that when the particle size is large, non-spherical particles such as rods, needles, and jujube seeds are likely to appear, and discloses In order to solve these problems, the patented method can be used to prepare particles below 25 microns, but when the particle size is made larger by adding toluene, the probability of non-spherical particles will increase greatly, so this method cannot be used to prepare 25 microns particles above

[0011] In summary, the preparation of granular catalyst components with a particle size above 50 microns by the existing technology is not satisfactory at present, and the production of catalyst components in this particle size range cannot meet the requirements.