A kinetic study of ethylene/1-hexene copolymerization is conducted with a supported metallocene catalyst in a gas-phase reactor. The investigation into the kinetics of ethylene/1-hexene copolymerization includes the effects of operational parameters such as the reaction temperature, pressure, and comonomer concentration. The large variations in gas-phase composition using only an initial charge of 1-hexene are illustrated by experiment. To remedy this, the ability to control the comonomer composition of 1-hexene online for the entire duration of the reaction is demonstrated. Online perturbation techniques are implemented to determine key kinetic parameters such as the activation energies for propagation and catalyst deactivation. From pressure perturbation results, a reaction rate order close to 1 is obtained for ethylene in the presence of 1-hexene. Finally, all the parameters obtained from the study are compared to those determined from ethylene-propylene (E-P) copolymerization.
A kinetic study of ethylene/1-hexene (E/1-H) copolymerization is conducted with a supported bridged metallocene catalyst in a gas phase reactor. The investigation into the kinetics of ethylene/1-hexene copolymerization includes the effects of operational parameters such as the reaction temperature, pressure, and comonomer concentration. On-line perturbation techniques are implemented to determine key kinetic parameters such as the activation energies for propagation and catalyst deactivation. A comparison of the kinetic parameters and behavior is made between the bridged and a previously studied unbridged catalyst. Finally, a two-site model is proposed to explain the observed kinetic behavior with changing reaction temperature and comonomer concentration.
A kinetic study of ethylene homopolymerization is conducted with a supported unbridged metallocene catalyst in a slurry reactor. The effects of operational parameters such as the reaction temperature and pressure on kinetics are investigated. The kinetic parameters which have been determined for this particular catalyst from previous gas phase studies are used in a slurry reactor model to predict the polymerization behavior under various reaction conditions. The experimental data compare favorably with the predictions from this model.
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