Reaction Calorimetric Approach to the Kinetic Investigation of the Propylene Bulk Phase Polymerization

Korber, Frank; Hauschild, Klaus; Fink, Gerhard

doi:10.1002/1521-3935(20011101)202:17<3329::aid-macp3329>3.0.co;2-d

Cited by 18 publications

(16 citation statements)

References 8 publications

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“…A kinetic investigation of the stereospecific propylene bulk polymerization with the applied industrial metallocene/MAO/SiO 2 -catalyst was already reported in a previous paper. [14] Electron Microscopy…”

Section: Propylene Bulk Polymerization Processmentioning

confidence: 99%

Early Stages of Propylene Bulk Phase Polymerization with Supported Metallocene Catalysts

Knoke

Korber

Fink

et al. 2003

Macro Chemistry & Physics

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For the initial steps of propylene bulk phase polymerization with a silica‐supported metallocene/MAO‐catalyst the processes of polymer growth, particle expansion and carrier fragmentation are investigated. Gravimetric analysis of the kinetics is given. Light optical examination of the particles shows a significant particle expansion during the first minutes of polymerization, which is not comparable to known observation from the slurry process. Electron microscopic investigation on cross sections of the polymer particles allows a detailed insight into the process of polymer growth, carrier fragmentation and particle expansion. The results are compared with the polymer growth and particle expansion model developed with slurry polymerizations under mild model conditions. In bulk phase polymerization particle expansion and carrier fragmentation are much faster due to more drastic reaction conditions. Nevertheless, it is still possible to observe a shell‐by‐shell degradation of the carrier material. Varying start up behaviors of single catalyst grains are observed. We are able to correlate the initial polymerization activity of individual grains with the cocatalyst loading and distribution on the catalyst carrier by means of microanalytical techniques. The results explain the varying start up behaviors of single grains. It becomes clear why different states of fragmentation are mixed up in the observed polymer samples.

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Section: Propylene Bulk Polymerization Processmentioning

confidence: 99%

Early Stages of Propylene Bulk Phase Polymerization with Supported Metallocene Catalysts

Knoke

Korber

Fink

et al. 2003

Macro Chemistry & Physics

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“…Korber et. Al., [6,7] working with a commercial calorimeter (RC1 from MettlerToledo) in the propylene polymerization via metallocenes, report comparable results between on-line calorimetry and propylene consumption measurement with a mass flowmeter. Altarawneh et.…”

Section: Introductionmentioning

confidence: 81%

“…This method (calorimetric) has been employed successfully in a variety of polymerization reactions. [4][5][6][7][8][9] Rincón et. Al.…”

Section: Introductionmentioning

confidence: 99%

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Ethylene Polymerization via Metallocenes: An Experimental Study

et al. 2015

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An experimental study oriented to gather kinetic modelling data in the ethylene polymerization via metallocenes is reported. Also is illustrated the employment of two methods for determination of kinetic behavior and the instantaneous activity of ZieglerNatta catalysts in the slurry polymerization of ethylene. The theoretical basis for both methods is described as well as the required instrumentation for its implantation at a laboratory level. An experimental program of polymerization with two different metallocenic systems was executed, showing that the direct (measurement of ethylene flow) as well as the calorimetric method (based on energy balances) give equivalent high quality information on the kinetic performance of the catalyst.

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“…This method (calorimetric) has been employed successfully in a variety of polymerization reactions [4][5][6][7][8][9]. In a recent report [9], the calorimetric method has been used for the monitoring of ethylene polymerization via metallocenes in a laboratory reactor.…”

Section: Introductionmentioning

confidence: 99%

On-Line Calorimetry in the Ethylene Coordination Polymerization

Infante¹,

Saldívar‐Guerra²,

Pérez‐Camacho³

et al. 2014

MRS Proc.

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The kinetic performance of metallocene type catalysts as well as their instantaneous activity is determined on line by two independent methods in the semi-batch polymerization of ethylene via metallocenes. On the basis of first-principles, both methods are described and guidelines for their implementation at a laboratory scale reactor are offered. Polymerization tests were conducted with two heterogenized metallocene catalysts showing that the direct method (based on ethylene flow measurement) and also the calorimetric method (based on energy balances) reported equivalent high quality information. The calorimetric method here developed can be readily used by the chemical practitioner as the notions and tools required for its implantation are easily grasped. It is noted that the calorimetric method has the advantage of requiring a low cost instrumentation (only thermocouples) whereas the direct method needs a relatively more sophisticated equipment (mass flow meter).

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Reaction Calorimetric Approach to the Kinetic Investigation of the Propylene Bulk Phase Polymerization

Cited by 18 publications

References 8 publications

Early Stages of Propylene Bulk Phase Polymerization with Supported Metallocene Catalysts

Early Stages of Propylene Bulk Phase Polymerization with Supported Metallocene Catalysts

Ethylene Polymerization via Metallocenes: An Experimental Study

On-Line Calorimetry in the Ethylene Coordination Polymerization

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