Abstract
The ethylene and ethylene/1-hexene polymerization activities of seven catalysts, consisting of ( n-BuCp) 2ZrCl 2/MAO supported on five different types of spherical polymer beads, were determined for gas-phase polymerization at 1.4 MPa ethylene pressure and initial 1-hexene concentrations of up to 40 mol/m 3. The catalytic activity for all the catalysts was highest at 80–90 °C. Copolymerization activities were higher than homopolymerization activities; the average rates for 1 h runs ranged from 0.1 to 4.1 and from 2.4 to 13 kg PE/(mol Zr s MPa C 2H 4) for homo- and copolymerization, respectively. Specific rates decreased with increasing Zr content for copolymerization (range of Zr concentration 0.21–0.39 mass%). The rates of 1-hexene incorporation decreased with increasing Al:Zr ratios (range of Al:Zr ratios 100–370). Most of the catalysts produced spherical copolymer particles without the production of fines. Molar masses of copolymers were lower than those of homopolymers, but they did not change appreciably with changes in 1-hexene concentration.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
