STUDIES ON THE CATALYTIC DEACTIVATION IN PROPYLENE POLYMERIZATION

Catalytic deactivation in gas phase propylene polymerization with CSBR was investigated in two concepts of chemical and physical ways. In ki netic consideration, catalyst deactivation followed the 2nd order reac tion due to chemical phenomenon like active site reduction. In case of physical consideration, catalyst deactivation was progressed by monom er diffusion resistance. It was due to formation of dense IPP around c atalyst at the beginning of polymerization. There were excessive monom er concentration differences between catalyst and polymer surfaces unt il 90 min after initial polymerization. Consequently, the main reason of catalyst deactivation is not only chemical phenomenon, but also phy sical one such as monomer diffusion resistance.