Mass Transfer Limitations and Copolymer Incorporationin Supported Single Site Catalyst Systems
| Title |
Mass Transfer Limitations and Copolymer Incorporationin Supported Single Site Catalyst Systems |
| Publication year |
2002 |
| Language |
English |
| Author |
Austad, Hans Kristian |
| Co-Authors |
Wigum, Hanne - Rytter, Erling - Follestad, Arild (Norner) - Fredriksen, Siw Bodil (Norner) |
| Source |
ECOREP conference, Lyon France, 1-4 July, 2002 |
| Abstract |
Poster. Supported single site catalysts for the production of polyolefins allow subtle tailoring of the polymer chemical structure in gas phase, slurry or bulk processes. The effect of heat and mass transfer limitations on polymerisation kinetics and morphology has been extensively discussed for the many variations of the Multigrain Model (MGM) and the Polymeric Flow Model (PFM). The assumptions in the MGM of a completely fragmented catalyst at the starting point of the polymerisation do not hold for later years supported single site catalysts. The initial polymerisation rate may be significantly slowed by delayed catalyst fragmentation, and the fragmentation process continues throughout the polymerisation. Typically, the silica supports are composed of irregular granular fragments and contain large internal voids. This actual particle morphology must be taken into account when evaluating potential mass transfer resistance in the growing polymer particle |