Preparation of titanium trichloride
AssigneeMitsubishi Chemical Industries Limited
InventorsYamaguchi Kazuo, Kakogawa Genjiro, Hasuo Masayoshi, Nobuaki Goko, Yasuo Maruyama
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Abstract
Solid titanium trichloride in the form of fine granules having low aluminum compound content, which is suitable as a catalyst for polymerization of .alpha.-olefins, especially, propylene is obtained as a precipitate by heating liquefied titanium trichloride in the presence of a liberating agent, and separating the thus formed precipitate. The liquefied titanium trichloride is preferably prepared with an reducing titanium tetrachloride by organic aluminium compound in the presence of ether and hydrocarbon.
Claims12
A process for the production of solid purple titanium trichloride suitable as a catalyst for polymerization of an .alpha.-olefin, which comprises:
- forming a homogeneous solution or mixture comprising titanium trichloride by treating titanium tetrachloride with an organoaluminum compound represented by the generic formula, AlR.sup.3.sub.n X.sub.3-n, wherein R.sup.3 denotes a hydrocarbon radical of 1 to 20 carbon atoms, n a number of the value of 1 to 3 and X a halogen atom, in the presence of an ether and hydrocarbon solvent, said ether having the generic formula, R.sup.1 --O--R.sup.2 wherein R.sup.1 and R.sup.2 are normal alkyl or normal alkenyl having at least six carbon atoms;
- and
- heating the thus obtained, homogeneous solution or mixture in the presence of a Lewis acid at a temperature in the range of 20.degree.-150.degree. C to cause precipitation of a finely granulated purple solid titanium trichloride and separating the precipitate.
Dependencies are inferred from the claim text.