Gas Phase Polymerization of α-Olefins with Ziegler — Natta and Metallocene Catalysts: a Comparison

1995 ◽  
pp. 363-386 ◽  
Author(s):  
K. D. Hungenberg ◽  
J. Kerth ◽  
F. Langhauser ◽  
B. Marczinke ◽  
R. Schlund
Keyword(s):  
Gas Phase ◽  
Metallocene Catalysts ◽  
Gas Phase Polymerization

Multizone circulating reactor modeling for gas-phase polymerization. I. Reactor modeling

2004 ◽  
Vol 93 (3) ◽  
pp. 1042-1052 ◽  
Author(s):  
Fabiano A. N. Fernandes ◽  
Liliane M. F. Lona
Keyword(s):  
Gas Phase ◽  
Reactor Modeling ◽  
Gas Phase Polymerization

Polymer-supported metallocene catalysts for gas-phase ethylene/1-hexene polymerization

2005 ◽  
Vol 293 ◽  
pp. 180-191 ◽  
Author(s):  
Long Wu ◽  
Jia-Min Zhou ◽  
David T. Lynch ◽  
Sieghard E. Wanke
Keyword(s):  
Gas Phase ◽  
Metallocene Catalysts ◽  
Polymer Supported

EXCITED STATES OF ACETYLENE AND THEIR ROLE IN PYROLYSIS

1958 ◽  
Vol 36 (1) ◽  
pp. 131-136 ◽  
Author(s):  
G. J. Minkoff
Keyword(s):  
Liquid Phase ◽  
Induction Period ◽  
Gas Phase ◽  
Recent Work ◽  
Excited States ◽  
Trans Configuration ◽  
Detailed Mechanism ◽  
Vinyl Polymerization ◽  
Gas Phase Polymerization ◽  
Kinetic Form

Previous theories of acetylene pyrolysis are reviewed in the light of recent work by Minkoff, Newitt, and Rutledge. It is shown that the relatively large rates observed at the beginning of the induction period do not agree with mechanisms involving the intervention of comparatively stable dimers. The required kinetic form is obtained, however, if a triplet diradical is produced on the surface in a bimolecular process, followed by gas phase polymerization, with some chain ending on the surface. The detailed mechanism closely resembles Flory's scheme for liquid phase vinyl polymerization. The shape of the radical is discussed, and it is suggested that the trans-configuration leads to polymerization, while the cis facilitates dehydrogenation.

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