Abstract
An order of magnitude model was developed in order to investigate the potential role of capillary effects during the polymerisation of olefins on supported catalysts. The model, based on the well-known Kelvin equation, showed that capillary effects will only be important (i.e. occur in reasonable pore sizes) in a limited number of situations. In gas phase systems, capillary condensation seems to play a role only in the homopolymerisation of propylene at pressures approaching the monomer dew point. In the case of ethylene co-butylene copolymers (linear low density polyethylene—LLDPE), no capillary effects were seen for pores much larger that 10 to 20 A. Finally, it was found that capillary effects did not maintain monomer in the liquid state in the case of bulk phase (boiling bed or liquid bed) polymerisation of propylene.
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