Development of an unsteady-state model for control of polymer grade transitions in Ziegler-Natta catalyzed reactor systems

The dynamics of the activity and polymer growth in Ziegler-Natta catalysts has been well established in the literature.[1,2] The corresponding dynamic behaviour of the reactor system is predicted using a segregation model approach and the unsteady state model of residence time distribution previously developed.[3] The model is therefore able to predict reactor performance for a time-varying catalyst flow rate through the reactor, as well as time-varying concentrations of monomer, co-catalyst and chain termination agent. A method of determining grade transition policies by the use of the developed reactor models is then presented. It is demonstrated that the reactor productivity, catalyst efficiency, average chain length and polydispersity can be controlled by the catalyst flow rate and reactor monomer and hydrogen concentrations. The relationship between the required polymer product properties and the system flow rates is determined. Case studies are presented that evaluate various transition strategies for a specific polymer grades. Copyright © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.Articl

Propylene copolymers with odd carbon number olefins

Preliminary investigation on propylene copolymers with odd carbon number olefin are reviewed. Additional experimental data presents propylene copolymers with i-heptene and i-nonene having higher impact strength and lower tensile strength values than copolymers of propylene and i-pentene.Thermoanalysis shows that the melting temperatures of the different copolymers decreases with increasing comonomer content. Slight changes were observed between the different propylene/1-heptene copolymer melting and propylene/1-pentene while the i-nonene copolymers show broadening of the melting curves as the comonomer content increases. It was highlighted that the source of novelty for these polymers is the comonomer type and content. Copyright © 2007 WILEY-VCH Verlag GmbH & Co. KGaA,.Articl