Regularities of trimerization of ethylene to hexene-1 on chromium-pyrrole catalytic system

This paper presents the results of the study of trimerization of ethylene to hexene-1 on chromium-pyrrole catalytic system in both semi-periodic and continuous processes under different reaction conditions. The influence of catalyst concentration, temperature and ethylene pressure on the kinetic profiles of have been studied. A comprehensive scheme describing the formation of all observed reaction products has been proposed. It has been concluded that all observed experimental results cannot be described within the framework of one, single kinetic model. This is due to the multistage nature of the process and the need of experimentally determination of the dependences of each stage on reaction parameters, including the stages of formation of catalytic intermediates, initiation, side reactions involving components of the catalytic system, and tri-, oligo-, and polymerization reactions.