Catalyst component used for vinyl polymerization, preparation method and application

Abstract

The invention provides a titaniferous solid catalyst component used for vinyl polymerization and a preparation method. The titaniferous solid catalyst component is prepared according to the following three continuous steps: 1) under the existence of halogen or halogen-containing compound, reacting metal magnesium with alcohol, thereby preparing a magnesium-containing solid; 2) utilizing an organic metallic compound or a mixture of the organic metallic compound and an electron donor compound to process the magnesium-containing solid, thereby obtaining a magnesium-containing catalyst carrier; and 3) under the existence of an inert organic solvent, utilizing a compound of transition metal titanium to process the magnesium-containing catalyst carrier, and then utilizing a halogenated alcohol compound to process, thereby obtaining the catalyst component. The preparation method has the characteristics of simple process, convenience in operation, low investment in industrial equipment, easiness in controlling the product quality, and the like. The titaniferous solid catalyst component has the characteristics of high vinyl polymerization catalytic activity, high copolymerizing capacity, high stacking density of polymer, less subdivision, and the like. The titaniferous solid catalyst component is suitable for slurry polymerization or gas-phase polymerization of vinyl, and is especiallysuitable for a gas-phase fluidized bed polymerization process for the vinyl, in which the catalyst is fed in a slurry form.

Description

technical field [0001] The invention relates to a titanium-containing solid catalyst component for ethylene polymerization, a preparation method and application, and belongs to the field of olefin polymerization. technical background [0002] With the development of the world's polyolefin industry, the continuous improvement and innovation of polyolefin production technology has made the polyolefin industry have higher and higher requirements for catalysts, and many different types of polyolefin catalysts have also appeared. [0003] In the polymerization of olefins, especially the homopolymerization of ethylene or the copolymerization of ethylene and α-olefins, catalyst components based on magnesium, titanium, halogen and electron donors are mostly used. When this type of catalyst is used in a gas-phase fluidized bed polymerization process, in order to ensure that the catalyst particle shape and particle size distribution are more suitable for fluidized state operation, the...

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Problems solved by technology

[0004] In the above-mentioned published patents, in order to make the catalyst applicable to the gas-phase fluidized bed polymerization process, there are stricter requirements on the average particle size, surface area, and pore size of the carrier silica used, and the price of this carrier is relatively high. At the same time, the silica carrier needs to be activated before use, which will increase the production cost of the catalyst; and the active component of the catalyst is loaded on the carrier by impregnation and other methods. Due to the limitation of the amount of titanium loaded, the catalyst Efficiency is not satisfactory

In addition, the amount of fine powder in the polyethylene powder produced by using this catalyst is relatively large, and the particles below 150 microns usually account for about 15wt% of the whole powder, which is undesirable in industrial production.

[0005] The catalyst production method mentioned in the Chinese patent CN 1085915A, although overcomes some shortcomings mentioned above, needs to use metal magnesium as a reducing agent in the production process, and still needs to use a large amount of silica carrier substances, and finally needs The method of spray drying is still required to obtain catalyst particle products, which requires large equipment investment and complicated operation, so that the overall production cost is still high

[0006] In the Chinese patent CN85100997, a catalyst for olefin polymerization is disclosed, which is formed by dissolving magnesium halide in organic epoxy compounds and organic phosphorus compounds to form a uniform solution, and then giving it with at least one precipitation aid and a polycarboxylic acid ester. It is prepared by the action of electron bodies and transition metal titanium halides and their derivatives. When the catalyst is used for propylene polymerization, it shows high polymerization activity and good stereospecificity, but when it is used for ethylene polymerization, the activity is low. , and the particle size distribution of the polymer is wide, and the sensitivity to hydrogen adjustment is not ideal

However, due to the preparation of the solid catalyst component using the pre-prepared alkoxymagnesium carrier, the production cost of the catalyst obtained in the process of industrial realization of this production method is relatively high, and the sphericity of the obtained catalyst is relatively poor

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