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1 Introduction It is i mportant to study polymerization mechanisminpolymerization engineering. Obtaining kinetic data isthe key step for establishing polymerization mechanismand understanding elementary reactions . The kineticdata contains two groups of data ,i.e.,the rate andreaction order .The rate ,especially the rate constant ,is i mportant and to be esti mated assuming that the or-der of the reactionis known.Furthermore ,esti mationof rate constants for polymerization is an active anddif… 相似文献
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Novel homo-dinuclear silicon bridged cyanoethyl cyclopentadienyl complexes of titanium and zirconium (CH3)2Si((η5-C5H3CH2CH2CN)(C5H5)MCl2)2 (M=Ti(1), Zr(2)) were synthesized and developed for the polymerization of ethylene. Compared with their corresponding mononuclear complexes (η5-C5H4CH2CH2CN)(C5H5)MCl2 (M=Ti(3), Zr(4)), the dinuclear complexes had higher catalytic activity. And the polyethylene produced had a higher molecular weight than that obtained with mononuclear catalysts. Effects of conditions on the ethylene polymerization catalyzed by (2)/MAO (methylaluminoxane) were studied in detail. The catalyst showed a very high activity ( >106g PE/mol Zr*h) under low catalyst concentration and high molar ratio of Al/Zr. 相似文献
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In this study on the nature of pressure signals generated by a deterministic or stochastic process in a bubbling fluidized
bed, pressure fluctuation measurements were carried out in a 300-mm-diamet column at 0.090 m and 0.40 m above the distributor
for different gas velocities. The method of detecting deterministic dynamic underlying pressure signals is proposed on the
basis of predictability of pressure fluctuations. The deterministic nature of dynamics in fluidizing system was verified.
The deterministic level of dynamics in fluidizing system was analyzed for different locations of pressure measurements and
different gas velocities.
Project supported by the Science and Engineering Foundation of SINOPEC, China (X599029) 相似文献
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