𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Ethylene Polymerization Kinetics with a Heterogeneous Metallocene Catalyst – Comparison of Gas and Slurry Phases

✍ Scribed by Michiel F. Bergstra; Günter Weickert

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
222 KB
Volume
290
Category
Article
ISSN
1438-7492

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Summary: Ethylene homopolymerizations were executed with a supported Ind~2~ZrCl~2~/MAO catalyst using the so‐called Reactive Bed Preparation method. This RBP method combined a slurry polymerization with a gas phase polymerization with the same polymerizing particles, i.e., a reactive bed. Polymerization kinetics were measured with high accuracy and reproducibility. Slurry and gas phase polymerization rates showed the same dependency on monomer bulk concentration. A complexation model has been proposed to describe the non‐first order polymerization rate‐monomer concentration dependence observed. This model also explains the non‐Arrhenius temperature dependence and the observed pressure dependence of the activation energy of the commonly used polymerization rate model: R~p~ = k~p~ · C* · M.
magnified image

📜 SIMILAR VOLUMES

Kinetic study of olefin polymerization w
Kinetic study of olefin polymerization with a supported metallocene catalyst. III. Ethylene homopolymerization in slurry
✍ S. Chakravarti; W. Harmon Ray 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 439 KB 👁 1 views

## Abstract A kinetic study of ethylene homopolymerization is conducted with a supported unbridged metallocene catalyst in a slurry reactor. The effects of operational parameters such as the reaction temperature and pressure on kinetics are investigated. The kinetic parameters which have been deter

Kinetic study of olefin polymerization w
Kinetic study of olefin polymerization with a supported metallocene catalyst. IV. Comparison of bridged and unbridged catalyst in gas phase
✍ S. Chakravarti; W. Harmon Ray; Simon X. Zhang 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 267 KB 👁 1 views

## Abstract A kinetic study of ethylene/1‐hexene (E/1‐H) copolymerization is conducted with a supported bridged metallocene catalyst in a gas phase reactor. The investigation into the kinetics of ethylene/1‐hexene copolymerization includes the effects of operational parameters such as the reaction

Kinetic study of olefin polymerization w
Kinetic study of olefin polymerization with a supported metallocene catalyst. II. Ethylene/1-hexene copolymerization in gas phase
✍ S. Chakravarti; W. Harmon Ray 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 636 KB

## Abstract A kinetic study of ethylene/1‐hexene copolymerization is conducted with a supported metallocene catalyst in a gas‐phase reactor. The investigation into the kinetics of ethylene/1‐hexene copolymerization includes the effects of operational parameters such as the reaction temperature, pre

Gas phase polymerization of ethylene wit
Gas phase polymerization of ethylene with a silica-supported metallocene catalyst: influence of temperature on deactivation
✍ Peter Roos; Gerben B. Meier; Job Jan C. Samson; Günter Weickert; K. Roel Westert 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 279 KB

## Abstract Ethylene was polymerized at 5 bar in a stirred powder bed reactor with silica supported __rac__‐Me~2~Si[Ind]~2~ZrCl~2~/methylaluminoxane (MAO) at temperatures between 40°C and 80°C using NaCl as support bed and triethylaluminium (TEA) as a scavenger for impurities. For this fixed recipe