Research Assistant, INTEC, Consejo Nacional de Investigaciones (CONICET), Argentina.
Catalyst fragmentation during propylene polymerization: Part I. The effects of grain size and structure
Article first published online: 25 AUG 2004
Copyright © 1987 Society of Plastics Engineers
Polymer Engineering & Science
Volume 27, Issue 19, pages 1436–1447, October 1987
How to Cite
Ferrero, M. A. and Chiovetta, M. G. (1987), Catalyst fragmentation during propylene polymerization: Part I. The effects of grain size and structure. Polym Eng Sci, 27: 1436–1447. doi: 10.1002/pen.760271903
- Issue published online: 25 AUG 2004
- Article first published online: 25 AUG 2004
Fragmentation of support/catalyst particles during propylene polymerization in the gas phase is analyzed via a mathematical model including energy and mass transfer with chemical reaction processes. The rupture phenomenon is considered specifically by the model, and evaluated as it proceeds in time, Two different regions are recognized in the polymerizing particle at fragmentation time: an inner core resembling the original solid support/catalyst structure, and an external set of layers where most of the polymerization occurs. Model predictions concerning the effects of fragmentation on polymerization are discussed. The influence of different degrees of fragmentation on thermal runaways and monomer availability at active sites located inside the support/catalyst/polymer complex is shown. Monomer concentration profiles inside the growing particles are explained in terms of the combined fragmentation-polymerization interaction. Results show a strong influence of catalyst structure on critical phenomena during early polymerization stages, and suggest the possibility of controlling critical parameters via the definition of fragment structure at catalyst preparation time.