Kinetic investigation of different supported catalysts for the polymerization of propylene under industrially relevant conditions

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Kinetic investigation of different supported catalysts for the polymerization of propylene under industrially relevant conditions

Joana Kettner

ISBN10: 373697003X

ISBN13: 978-3736970038

Kinetic investigation of different supported catalysts for the polymerization of propylene under industrially relevant conditions

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title Kinetic Investigation of Different Supported Catalysts for the Polymerization of Propylene Under Industrially Relevant Conditions
authors Joana Kettner
publisher Cuvillier
publishedDate 2019-05-14
description Scope of the work is the kinetic investigation of two fourth generation Ziegler-Natta catalysts as well as a supported metallocene catalyst for the polymerization of propylene under industrially relevant conditions and the development of simplified phenomenological kinetic models describing the polymerizations. Therein, the influence of different reaction conditions (temperature, pressure, hydrogen concentration) and, in particular, the effect of prepolymerization on catalyst kinetics as well as on polymer characteristics are studied. The Ziegler-Natta catalysts were investigated under gas-phase conditions in a 5 l horizontal stirred tank reactor operating in semi-batch mode. Both catalysts showed a similar kinetic behavior as well as hydrogen response at the different reaction conditions. Applying a prepolymerization led to an increase in activity at higher reaction temperatures as well as an improved polymer morphology. The impact of prepolymerization is catalyst specific and depends on the catalyst activity reached at main polymerization temperature. The supported metallocene catalyst was studied under bulk conditions in liquid propylene using a special 250 ml reaction calorimeter. A focus was set on procedure development (in-situ and external prepolymerization) with the target of defined prepolymerization conditions and early access to the kinetic profile. Final kinetic measurements were carried out using the developed external prepolymerization procedure. Based on the experimental studies, simplified phenomenological kinetic models are developed for each catalyst type enabling the quantitative description of the polymerization reactions at the different reaction conditions including the effect of prepolymerization. Main hypothesis for the mathematical description of the prepolymerization effect is that particle overheating at the beginning of the polymerization is the major reason for lower activities obtained when no prepolymerization is applied. For particle
pageCount 176
printType BOOK
maturityRating NOT_MATURE
panelizationSummary
language en
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