Abstract

A study was made of ethylene oligomerization over system TiCl 4-C 2H 5AlCl 2 in benzene at temperatures of 5–80°. It is shown that the increase in the rate of oligomerization with time in the initial period at temperatures of 5–40° is due to the low rate of alkylation of TiCl 4 by ethyl- or methylaluminium dichloride. The results of an EPR investigation of reactions in the systems TiCl 4-CH 3AlCl 2, and hydrolysis of the system TiCl 4-C 2H 5AlCl 2 and determination of the ethane content in the gaseous products of hydrolysis after the oligomerization show that chain propagation takes place through the TiC bond. Radio-chemical and chromatographic methods were used to determine the degree of alkylation of TiCl 4, and the concentration of growth centres in the system TiCl 4-C 2H 5AlCl 2 during the oligomerization process at 20–80°. The effective rate constants for chain propagation were calculated.

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