Polymerization of ethylene by the Zieglar–Natta catalyst systems – TiCl4/Al(C2H5)3 supported on carbon blacks

The kinetics of ethylene polymerized on the TiCl4/AlEt3/carbon blacks with TiCl4/AlEt3/carbon black catalyst system was investigated, and a model was established. It is shown that the polymerization is determined by the features of the polymerization processes on the surface of the fillers, which depends on the surface adsorption of the AlEt3 and a monomer and the surface reaction rate between them. A comparison of catalysts supported on two kinds of carbon black, acetylene black and the N550, has been made. It is found that the polymerization rates are directly a proper trend to the surface area of the two supports. Furthermore, the influence of the Al/Ti ratio, Ti content and the polymerization temperature on polymerization kinetics has been studied. The relation between the polymerization rate and temperature has been investigated in detail and described by the Arrenius law. In addition, it is found that in contrast to the unsupported TiCl4, the interplay between the catalyst and the carrier is considerably important in the polymerization kinetics.