Optimization of synthesis of a titaniumcatalyst supported on alumina for synthesis of ultra-high molecular-weightpolyethylene (UHMWPE)

Ethylene polymerized under low pressure over a catalytic system (modified Аl2Оз/ТlСl4 + AlEt2Cl) yields UHMWPE. Alumina gel chlorinated and calcined (above 773 K) was used as a catalyst carrier. The effect of the main variables of carrier chlorination (concentration of HCl, chlorination time and temperature) and of the calcination temperature on activity of the catalytic system was investigated. A mathematical method of planning experiments and evaluating experimental results was used in order to improve both the analysis of the conditions of the preliminary modification of the support and their optimization. Relationships between the surface properties of the alumina carrier and the activi…