PROCESS FOR THE PREPARATION OF TITANIUM TRICHLORIDE STARTING AT LOW TEMPERATURE AND ITS USE IN THE POLYMERIZATION OF ETHYLENICALLY UNSATURATED HYDROCARBONS

摘要

1390355 Preparation of titanium trichloride catalyst component SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV 18 Dec 1972 [20 Dec 1971] 59013/71 Heading C3P A catalyst component, suitable for the polymerization of ethylenically unsaturated hydrocarbons when combined with a dialkyl aluminium monohalide, is obtained by (a) the addition of titanium tetrachloride to a trialkyl aluminium in a liquid alkane at -95‹C. to -150‹ C. and (b) subsequently increasing the temperature to above +15‹ C. to convert the beta-TiCl 3 obtained to the desired gamma- TiCl 3 catalyst component. The component may be washed and/or treated with a complexing agent such as an ether. A small amount of prepolymerization may occur to improve the catalyst. In examples TiCl 4 and (C 2 H 5 ) 3 Al are reacted in pentane (and for comparison in 2,2,4- trimethylpentane) at low temperatures within the above range and the products used, with (C 2 H 5 )AlCl, for polymerizing propene, including block copolymerization thereof with ethylene, optionally in the presence of hydrogen. Dibutyl ether heptane washing of the catalyst component is also effected in one case.