Catalyst components in use for polymerizing ethylene, and catalyst

Abstract

This invention relates to components and preparation method for a composite carrier catalyst for ethylene homopolymerization or copolymerization with other alpha-olefins. The catalyst comprises at least one Mg composite, at least one Ti compound, at least one organic alcohol compound, at least one Si compound, and at least one inorganic inert carrier. The Mg composite is prepared by dissolving Mg compound in organic epoxy compound and organic phosphorus compound system. The catalyst has such advantages as high catalytic activity, high hydrogen sensitivity and narrow particle size distribution of polymer. The catalyst is suitable for slurry polymerization of ethylene, combined polymerization process where catalyst with high activity and good particle morphology is needed, and gas phase fluidized bed process.

Description

technical field [0001] The present invention relates to a catalyst component for ethylene polymerization or copolymerization, a method for preparing the catalyst component and a catalyst for the catalyst component. technical background [0002] As we all know, the catalyst system containing Ti / Mg composite plays a dominant role in the industrial production of polyethylene, and the core of its research is nothing more than the polymerization activity of the catalyst, the particle shape and particle size distribution of the catalyst, the hydrogen adjustment sensitivity and Copolymerization performance and so on. In the ethylene polymerization process, in addition to requiring the catalyst to have high catalytic activity, it is very important to control the particle size and particle size distribution of the ethylene polymer produced by controlling the catalyst particles. With the application of the condensed state in the ethylene gas phase polymerization process, especially t...

AI Technical Summary

Problems solved by technology

However, because the carrier particles are too small, they are easy to aggregate and cause inhomogeneity of the catalyst particles. In order to increase the size of the supported catalyst particles and improve the fluidity

This patent adopts the method of spray drying in the preparation of the catalyst. The mother liquor is mixed with the silica gel filler, and then prepared by the method of spray drying. The loading capacity of the catalyst reaches 2.0% to 3.0%, and the catalyst activity is high, which can be applied It is suitable for the gas-phase fluidized bed condensed state and super-condensed state polymerization process of ethylene, but for the combination process requiring high activity catalyst, the particle size is not easy to control

At the same time, the catalyst preparation method has expensive equipment and low production efficiency.