Gas-Phase Polymerization of Propene with the Supported Ziegler Catalyst: TICI4/MgCI2/C6H5COOC2H5/AI(C2H5)3

Abstract

The gas-phase polymerization of propene with the MgCl2-supported TlCl4/C6H5COOC2H5 catalyst in conjunction with Al(C2H5)3 has been investigated. The rate of polymerization depends on both titanium content and surface area of the MgCla-supported catalyst and decreases with the polymerization time. The number of active centers in the catalyst at different polymerization times is estimated by the inhibition method using carbon monoxide. As a result, the number of active centers decreasesduring the course of polymerization, but the mean propagation rate constant kp remains constant. The value of kp is one order of magnitude larger than that in the conventional TlCl3 catalyst. © 1982, American Chemical Society. All rights reserved.