PREPARATION OF VIOLET TICL3

摘要

A process for the preparation of violet TiCl3 by reducing TiCl4 with an organo-aluminum compound, characterized in that: (a) the TiCl4 is premixed with a complexing agent in an inert organic solvent, the molar ratio complexing agent:TiCl4 being within the range from 0.3:1 to 2:1; (b) the organo-aluminum compound is premixed with a complexing agent in an inert organic solvent, the molar ratio complexing agent:organo-aluminum compound being at least 0.25:1; (c) the reduction to TiCl3 and precipitation of TiCl3 are carried out by combining at least one stoichiometric equivalent of TiCl4 in the premixed composition of step (a) with one stoichiometric equivalent of the organoaluminum compound in the premixed composition of step (b) over a period of less than one hour at a temperature within the range 60 DEG to 110 DEG C.; and (d) the final concentration of violet TiCl3 in the reaction mixture is at least 0.2 mol./liter.