The effect of some selected variables on the ethylene polymerization with a titanium catalyst on magnesium carrier
The course of ethylene polymerization catalyzed by a system composed of TiCl4 on a MgCh(THF)2 carrier and of an AlEt2Cl cocatalyst was investigated and a stable character of this system confirmed. It was established that an increase in the scale of polymerization essentially increases the concentration of active centres and reduces catalyst deactivation. The effect of carrier purity and presence of hydrogen on the catalyst activity and molecular weight of polyethylene was determined. These results indicate for a necessity of a careful removal from the carrier of tin compounds (deriving from the carrier synthesis) because of a strong deactivating action of these compounds on the catalytic centres. Hydrogen was of little effectiveness as an regulator of molecular weight of polyethylene prepared wih the use of the investigated catalytic system.
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