Abstract
SummaryThe impact of injection conditions of a supported Ziegler Natta catalyst on the rate of polymerization of propylene in a gas phase process is investigated. It is observed that the instantaneous rate of propylene polymerization is higher if the catalyst is injected wetted with a hydrocarbon before being charged to the reactor. This is attributed to the effect of the hydrocarbon in decreasing local particle overheating for the critical initial instants of polymerization, due to lower diffusion of the monomer to the active sites and to absorption of the heat of vaporization. An enhancement of the observed initial polymerization rate is also observed with prepolymerization.
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