Effect of Light on the Activity of Metallocene Catalysts in the Gas-Phase Polymerisation of Ethylene

Kallio, Kalle; Wartmann, Anette; Reichert, Karl‐Heinz

doi:10.1002/1521-3927(20011101)22:16<1330::aid-marc1330>3.3.co;2-2

Cited by 2 publications

(4 citation statements)

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“…The highest activity was achieved under a blue light (300−480 nm) and was about 45% higher when compared to polymerization performed under red light (>600 nm). Furthermore, the activation effect of light irradiation was reported to be reversible . The phenomena became more pronounced when the polymerization systems were treated with small amounts of dioxygen or carbon dioxide.…”

Section: 4 Lights Camera Actionmentioning

confidence: 99%

“…One of the most fascinating results to arise from the use of video microscopy is the effect that illumination has on polymerization activity. − Kallio and co-workers set out to perform kinetic studies on silica-supported metallocene/MAO catalyst in the gas-phase polymerization of ethylene, using video microscopy. However, the group found that the illumination light caused reproducibility problems in their kinetic measurements.…”

Section: 4 Lights Camera Actionmentioning

confidence: 99%

“…Furthermore, the activation effect of light irradiation was reported to be reversible. 79 The phenomena became more pronounced when the polymerization systems were treated with small amounts of dioxygen or carbon dioxide. The activity of the poisoned system reduced rapidly but totally recovered after approximately 20 min of irradiation.…”

Section: Lights Camera Actionmentioning

confidence: 99%

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“Bound but Not Gagged”Immobilizing Single-Site α-Olefin Polymerization Catalysts

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Section: 4 Lights Camera Actionmentioning

confidence: 99%

Section: 4 Lights Camera Actionmentioning

confidence: 99%

Section: Lights Camera Actionmentioning

confidence: 99%

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“Bound but Not Gagged”Immobilizing Single-Site α-Olefin Polymerization Catalysts

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“…Experiments can be run up to 90°C using water as a thermostating agent and a pressure of 16 bars. Recently, the same setup has been used for gas‐phase polymerization of ethylene with a supported single‐site catalyst 2…”

Section: Polymerization Experimentsmentioning

confidence: 99%

Gas‐phase polymerization of butadiene. Data acquisition using minireactor technology and particle modeling

Bartke

Wartmann

Reichert

2002

J of Applied Polymer Sci

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Minireactor technology has been used for kinetic studies on polymerization kinetics, phase equilibrium, and mass transfer on a very small scale. There is a nonlinear influence of temperature and pressure on the polymerization rate. The phase equilibrium can be described by a Flory-Huggins approach, with a temperature-dependent interaction parameter. The diffusion coefficient seems to be slightly pressure dependent, and the temperature dependence can be described with an Arrhenius equation. A simple formal kinetic scheme with formation of active sites, chain propagation, chain transfer to cocatalyst, and deactivation of active sites has been applied. This kinetic scheme was implemented in two different models; they are, a particle model taking into account mass transfer and a simple chemical model with no mass transfer. In principle, both models describe the experimental results for rate and molecular weight distribution equally well, with rate constants of the same magnitude. Molecular weight distributions calculated by the chemical model are narrower. However, the chemical model gives no explanation for the experimental observed rate dependence on catalyst particle size. With increasing catalyst activity, the differences between both models become more significant and the particle model becomes more and more important.

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Effect of Light on the Activity of Metallocene Catalysts in the Gas-Phase Polymerisation of Ethylene

Cited by 2 publications

References 0 publications

“Bound but Not Gagged”Immobilizing Single-Site α-Olefin Polymerization Catalysts

“Bound but Not Gagged”Immobilizing Single-Site α-Olefin Polymerization Catalysts

Gas‐phase polymerization of butadiene. Data acquisition using minireactor technology and particle modeling

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