Preparation method for pentamethyl cyclopentadiene metallocene catalyst

Abstract

The invention relates to a preparation method for a pentamethyl cyclopentadiene metallocene catalyst. The method is characterized by including: first, dripping an equivalent amount of a pentamethyl cyclopentadiene halohydrocarbon solvent into a halohydrocarbon solvent of titanium tetrachloride in an room temperature environment, then conducting proper stirring refluxing, filtering and spin drying, then washing the obtained dark red crystals with an n-hexane solvent, and performing drying. The method improves the purification conditions in the traditional purification process, the n-hexane solvent is employed to purify the obtained product, and the yield is increased to 88%, which is more than 1.5 times that of the traditional purification process. With very strong market competitiveness, the method greatly improves the practicability, reliability and economical efficiency of the technology, and the purity can reach over 99%.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a pentamethylcyclopentadiene metallocene catalyst. Background technique [0002] Metallocenes can generally be characterized as coordination compounds incorporating one or more cyclopentadienyl (Cp) groups (which may be substituted or unsubstituted) coordinated to a transition metal via a double bond. Highly active polymerization catalysts are formed when certain metallocene compounds are combined with activators or cocatalysts such as methylaluminoxane (MAO) and possibly also alkylating / scavenging agents such as trialkylaluminum compounds . Various types of metallocenes are known in the art. They include monocyclic (single cyclopentadienyl), bicyclic (two cyclopentadienyl), or tricyclic (three cyclopentadienyl), coordinated to a central transition metal. Homogeneous or unsupported metallocene catalysts are known to have high catalytic activity, esp...

AI Technical Summary

Problems solved by technology

In the case of polymerizations where the polymer is formed as solid particles, these homogeneous (soluble) catalysts can form polymer deposits on the reactor walls and stirrers, which should be removed frequently as they prevent cooling of the reactor Efficient heat exchange necessary for internal reactants and excessive wear on moving parts

In addition, the solid particles formed by such homogeneous catalysts have poor morphology and low apparent density, they are difficult to circulate in the reactor, limiting the throughput, and they are also difficult to transport outside the reactor