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2011, Volume 5, Issue 1

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Frontiers of Chemical Science and Engineering >> 2011, Volume 5, Issue 1 doi: 10.1007/s11705-010-0558-x

Gas phase ethylene polymerization over SiO

1. School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China; 2. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; 3. Research Institute of Qilu Branch Co., SINOPEC, Zibo 255400, China

Available online: 2011-03-05
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Abstract

Although an important industrial catalyst for producing high density polyethylene, the SiO -supported organosilyl chromate UCC S-2 catalyst has not been fully investigated compared with the SiO -supported oxo chromium Phillips catalyst. In this work, gas phase ethylene polymerization by S-2 catalysts (Cat-1, Cat-2, and Cat-3) was carried out in a high-speed stirred-autoclave reactor. The effects of temperature, time, and pressure on kinetics, activity, and product properties were studied. All kinetics were typical built-up types with slow decay. Compared to the simple physical mixtures of Cat-1 and Cat-2, Cat-3 showed higher activity and its product had a broader molecular weight distribution, indicating new active species induced during blending of Cat-1 and Cat-2 in -hexane. The innovation by a simple catalyst technology created a new application to meet market demands.

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